Download NELLCOR N-3900 Patient Monitor Service Manual

SERVICE MANUAL
Nellcor Puritan Bennett™
NPB-3900 Patient Monitor
To contact Nellcor Puritan Bennett’s representative: In the United States, call 1-800-NELLCOR or 510 463-4000;
outside the United States, call your local Nellcor Puritan Bennett representative.
Caution: Federal law (U. S.) restricts this device to sale by or on the order of a physician.
© 1998 Nellcor Puritan Bennett Inc. All Rights Reserved
0123
047940A-0398
Corporate Headquarters
Regional/Local Offices
Nellcor Puritan Bennett Inc.
4280 Hacienda Drive
Pleasanton, California 94588
U.S.A.
Tel. 510 463-3900 or
1-800-NELLCOR
Nellcor Puritan Bennett UK Ltd.
10, Talisman Business Centre
London Road
Bicester, Oxfordshire OX6 0JX
United Kingdom
Tel. +44.1869.322700
U. S. Service Repair Center
Nellcor Puritan Bennett Belgium NV/SA
Interleuvenlaan 62/8, Zone 2
B-3001 Heverlee
Belgium
Tel. +32.16.400467
Nellcor Puritan Bennett Inc.
2200 Faraday Avenue
Carlsbad, California 92008
U.S.A.
Tel. 619 482-5000
European Office
Nellcor Puritan Bennett Europe BV
Hambakenwetering 1
5231 DD ’s-Hertogenbosch
The Netherlands
Tel. +31.73.6485200
Asia/Pacific Office
Nellcor Puritan Bennett HK Ltd.
Room 1602 Evergo House
38 Gloucester Road
Wanchai
Hong Kong
Tel. +852.2529.0363
Nellcor Puritan Bennett France
3 avenue du Canada, Bâtiment Sigma
LP851 Les Ulis
91975 Courtaboeuf Cedex
France
Tel. +33.1.69.82.14.66
Nellcor Puritan Bennett Germany GmbH
Black-&-Decker-Strasse 28
65510 Idstein
Germany
Tel. +49.6126.5930
Nellcor Puritan Bennett Italia S.r.L.
Via Edison 6
20090 Assago (MI)
Italy
Tel. +39.2.4577161
Nellcor Puritan Bennett Finland Oy
Kappelitie 8
02200 Espoo
Finland
Tel. +358.9.270.92.900
To obtain information about a warranty, if any, for this product, contact Nellcor Puritan Bennett
Technical Services or your local Nellcor Puritan Bennett representative.
Nellcor Puritan Bennett, Durasensor, Oxisensor II, Oxichip, C-Lock, and the Nellcor Puritan Bennett
knob configuration are trademarks of Nellcor Puritan Bennett Incorporated.
SureTemp is a trademark of Welch Allyn, Inc.
Covered by one or more of the following U. S. Patents and foreign equivalents: 4,621,643; 4,653,498;
4,700,708; 4,770,179;,4,869,254; 4,928,692; 4,934,372; 5,078,136; 5,368,224; 5,632,555; Re.35,122.
Table of Contents
TABLE OF CONTENTS
List of Figures
List of Tables
List of Figures..................................................................................................v
List of Tables..................................................................................................vi
Section 1: Introduction.................................................................................... 1-1
1.1 Manual Overview.................................................................................. 1-1
1.2 Warnings, Cautions, and Notes ........................................................... 1-1
1.3 NPB-3900 Patient Monitor Description ................................................ 1-1
1.4 P-3900 Introduction.............................................................................. 1-2
1.5 Related Documents.............................................................................. 1-2
Section 2: Routine Maintenance .................................................................... 2-2
2.1 Cleaning ............................................................................................... 2-2
2.2 Periodic Safety and Functional Checks ............................................... 2-2
2.3 Battery.................................................................................................. 2-2
2.4 Environmental Protection ..................................................................... 2-3
Section 3: Performance Verification .............................................................. 3-1
3.1 Introduction .......................................................................................... 3-1
3.2 Equipment Needed .............................................................................. 3-1
3.3 Performance Tests............................................................................... 3-2
3.4 Safety Tests ....................................................................................... 3-15
Section 4: Power-Up Defaults Menu and Diagnostic Mode ......................... 4-1
4.1 Introduction .......................................................................................... 4-1
4.2 Power-Up Defaults Menu ..................................................................... 4-1
4.3 Restoring Factory Settings................................................................... 4-4
4.4 Diagnostic Mode .................................................................................. 4-4
Section 5: Troubleshooting ............................................................................ 5-1
5.1 Introduction .......................................................................................... 5-1
5.2 How to use This Section ...................................................................... 5-1
5.3 Who Should Perform Repairs .............................................................. 5-1
5.4 Replacement Level Supported............................................................. 5-1
5.5 Obtaining Replacement Parts .............................................................. 5-2
5.6 Troubleshooting Guide......................................................................... 5-2
5.7 Troubleshooting the Oximetry Function ............................................. 5-11
5.8 P-3900 Troubleshooting Guide .......................................................... 5-17
Section 6: Disassembly Guide........................................................................ 6-1
6.1 Introduction .......................................................................................... 6-1
6.2 How to use This Section ...................................................................... 6-2
6.3 Disassembly Flow Charts..................................................................... 6-2
6.4 Closed Case Disassembly ................................................................... 6-7
6.5 Front Case Disassembly .................................................................... 6-16
6.6 Rear Case Disassembly..................................................................... 6-20
6.7 Main PCB Disassembly...................................................................... 6-22
Section 7: Spare Parts..................................................................................... 7-1
7.1 Introduction .......................................................................................... 7-1
7.2 Top Level Assembly............................................................................. 7-1
7.3 Front Case Assembly........................................................................... 7-2
7.4 Rear Case Assembly ........................................................................... 7-2
7.5 Main PCB Assembly ............................................................................ 7-3
iii
Table of Contents
7.6 P-3900 Printer ...................................................................................... 7-4
Section 8: Packing For Shipment................................................................... 8-1
8.1 General Instructions ............................................................................. 8-1
8.2 Repacking In Original Carton ............................................................... 8-1
8.3 Repacking In a Different Carton........................................................... 8-1
Section 9: Specifications ................................................................................ 9-1
9.1 General ................................................................................................ 9-1
9.2 Safety Standards.................................................................................. 9-1
9.3 Electrical............................................................................................... 9-2
9.4 Environmental ...................................................................................... 9-2
9.5 Measuring Parameters.......................................................................... 9-2
9.6 Trends .................................................................................................. 9-7
9.7 P-3900 Printer (Optional) ..................................................................... 9-7
Section 10: RS-232 Interface......................................................................... 10-1
10.1 Serial Interface Connection.............................................................. 10-1
10.2 Nurse Call ........................................................................................ 10-1
10.3 Exporting Trend Data ....................................................................... 10-2
Appendix - Technical Supplement ..................................................................A-1
A-1 General................................................................................................A-1
A-2 Block Diagram .....................................................................................A-1
A-3 Isolated Patient Connection Section....................................................A-2
A-4 Temperature Measurement Circuit......................................................A-4
A-5 ECG Inputs ..........................................................................................A-7
A-6 On/Off Power Control ..........................................................................A-9
A-7 Audio Volume and Speaker Drive .....................................................A-11
A-8 Power Supplies..................................................................................A-12
A-9 NIBP Section .....................................................................................A-17
A-10 System A/D......................................................................................A-20
A-11 Buttons And Lights ..........................................................................A-22
A-12 SpO2 ................................................................................................A-22
A-13 Microcontroller .................................................................................A-28
A-14 Program Storage/Execution ............................................................A-32
A-15 Dram Control ...................................................................................A-33
A-16 Real Time Clock (RTC) ...................................................................A-34
A-17 Uart Operation .................................................................................A-36
A-18 FPGA Glue Logic.............................................................................A-37
iv
Table of Contents
LIST OF FIGURES
Figure 5-1: Preamplifier and PGA Outputs ...................................................... 5-12
Figure 5-2: Filter Outputs and ADC Input ...................................................... 5-513
Figure 5-3: SpO2 Module with an SRC-2......................................................... 5-14
Figure 5-4: SpO2 Module with SRC-2 Drive Current Test at TP7.................... 5-15
Figure 5-5: SpO2 Module with SRC-2.............................................................. 5-16
Figure 6-1: Top Level Disassembly Flow Chart . 6-Error! Bookmark not defined.
Figure 6-2: Front Case Disassembly Flow Chart ............................................... 6-4
Figure 6-3: Rear Case Disassembly Flow Chart................................................ 6-5
Figure 6-4: Main Board Disassembly Flow Chart .............................................. 6-6
Figure A-1: NPB-3900 Block Diagram ...............................................................A-2
Figure A-2: Temperature Measurement Circuit .................................................A-6
Figure A-3: ECG Processing Circuitry, First Stage............................................A-8
Figure A-4: ECG Processing Circuitry, Second Stage.......................................A-9
Figure A-5: Power ON/OFF Circuitry ...............................................................A-10
Figure A-6: Watchdog Circuitry........................................................................A-11
Figure A-7: Audio Volume Circuitry..................................................................A-12
Figure A-8: Buck Power Regulator, Simplified Schematic & Waveforms ........A-13
Figure A-9: Battery Charger Circuitry...............................................................A-14
Figure A-10: 3.3V Regulated Supply................................................................A-15
Figure A-11: 5V Regulated Supply Circuitry ....................................................A-15
Figure A-12: LCD Bias Supply Circuitry...........................................................A-16
Figure A-13: LCD Backlight Supply Circuitry ...................................................A-16
Figure A-14: Isolated ±5V Supply Circuitry......................................................A-17
Figure A-15: NIBP Power Sourcing Circuitry ...................................................A-17
Figure A-16: NIBP Pump Control Circuitry.......................................................A-18
Figure A-17: NIBP Pressure Sensors Processing Circuitry .............................A-19
Figure A-18: Proportional Valve Powering Circuitry.........................................A-20
Figure A-19: A/D Circuitry ................................................................................A-21
Figure A-20: Interfacing with SpO2 Processing...............................................A-23
Figure A-21: Microcontroller Signal Assignments............................................A-29
Figure A-22: Flash Timing Parameters ............................................................A-32
Figure A-23: DRAM Timing Parameters ..........................................................A-33
Figure A-24: RAS and CAS Timing..................................................................A-34
Figure A-25: Read Timing................................................................................A-35
Figure A-26: Write Timing ................................................................................A-35
Figure A-27: Data Signal..................................................................................A-37
Figure A-28: Control Signal..............................................................................A-37
Figure A-29: NPB-3900 Top Assembly Drawing (Sheet 1 of 2).......................A-43
Figure A-29: NPB-3900 Top Assembly Drawing (Sheet 2 of 2).......................A-45
Figure A-30: NPB-3900 Front Case Assembly Drawing (Sheet 1 of 2) ...........A-47
Figure A-30: NPB-3900 Front Case Assembly Drawing (Sheet 2 of 2) ...........A-49
Figure A-31: NPB-3900 Rear Case Assembly Drawing...................................A-51
Figure A-32: P-3900 Assembly Drawing..........................................................A-53
Figure A-33: NPB-3900 Interconnect Diagram ................................................A-55
Figure A-34: Main PCB Schematic Diagram (Sheet 1 of 5).............................A-57
Figure A-34: Main PCB Schematic Diagram (Sheet 2 of 5).............................A-59
Figure A-34: Main PCB Schematic Diagram (Sheet 3 of 5).............................A-61
Figure A-34: Main PCB Schematic Diagram (Sheet 4 of 5).............................A-63
Figure A-34: Main PCB Schematic Diagram (Sheet 5 of 5).............................A-65
Figure A-35: NPB-3900Patient Connector PCB Schematic Diagram..............A-67
v
Table of Contents
LIST OF TABLES
Table 1-1: Model Configuration.......................................................................... 1-2
Table 3-1: Required Test Equipment ................................................................. 3-1
Table 3-2: SRC Settings and NBP-3900 Indications ......................................... 3-6
Table 3-3: Serial Interface Measurements....................................................... 3-13
Table 3-4: Current Test.................................................................................... 3-16
Table 3-5: Leakage Current ............................................................................. 3-16
Table 4-1: Power-Up Defaults Menu.................................................................. 4-1
Table 4-2: A/D Channel Designators ................................................................. 4-7
Table 5-1: Problem Categories .......................................................................... 5-2
Table 5-2: Power Problems ............................................................................... 5-3
Table 5-3: Serviceable Hardware Error Codes .................................................. 5-5
Table 5-4: Error Code Categories...................................................................... 5-8
Table 5-5: Buttons/Knob Problems .................................................................... 5-9
Table 5-6: Display/Audible Tones Problems...................................................... 5-9
Table 5-7: Operational Performance Problems ............................................... 5-10
Table 5-8: Fault Evaluation .............................................................................. 5-11
Table 5-9: P-3900 Troubleshooting Guide....................................................... 5-17
Table 7-1: Top Level Assembly ......................................................................... 7-1
Table 7-2: Front Case Assembly ....................................................................... 7-2
Table 7-3: Rear Case Assembly ........................................................................ 7-2
Table 7-4: Main Board Assembly....................................................................... 7-3
Table 7-5: Main PCB Jumper Configuration ...................................................... 7-3
Table 7-5: P-3900 Printer................................................................................... 7-4
Table 10-1: RS-232 Serial Interface Connections ............................................. 7-1
Table A-1: Oxichip Circuit Pin Descriptions .....................................................A-23
vi
SECTION 1: INTRODUCTION
1.1 Manual Overview
1.2 Warnings, Cautions, and Notes
1.3 NPB-3900 Patient Monitor Description
1.4 P-3900 Introduction
1.5 Related Documents
1.1 MANUAL OVERVIEW
This manual contains information for servicing the NPB-3900 series of patient
monitors. Only qualified service personnel should service this product. Before
servicing the NPB-3900, read the operator’s manual carefully for a thorough
understanding of operation.
1.2 WARNINGS, CAUTIONS, AND NOTES
This manual uses three terms that are important for proper operation of the
monitor: Warning, Caution, and Note.
1.2.1 Warning
A warning precedes an action that may result in injury or death to the patient or
user. Warnings are boxed and highlighted in boldface type.
1.2.2 Caution
A caution precedes an action that may result in damage to, or malfunction of, the
monitor. Cautions are highlighted in boldface type.
1.2.3 Note
A note gives information that requires special attention.
1.3 NPB-3900 PATIENT MONITOR DESCRIPTION
The purpose and function of the NPB-3900 series of patient monitors is to
monitor: ECG; heart rate; noninvasive blood pressure (systolic, diastolic, and
mean arterial pressures); functional arterial oxygen saturation; and temperature
for adult and pediatric patients in all hospital areas and hospital-type facilities.
They may be used during hospital transport and in mobile, land-based
environments, such as ambulances.
Refer to the NPB-3900 operator’s manual for a description of the NPB-3900
controls, indicators, and operation. The physical and operational characteristics
of the monitors are described in the operator’s manual and Section 9,
Specifications, of this manual.
The parameter measurements for each model in the NPB-3900 series are
indicated in Table 1-1.
1-1
Section 1: Introduction
Table 1-1: Model Configuration
Model
Parameter
NIBP
SpO2
NPB-3910
X
X
NPB-3920
X
X
NPB-3930
X
X
NBP-3940
X
X
TEMP
ECG
X
X
X
X
1.4 P-3900 INTRODUCTION
The P-3900 is an optional, standalone printer designed for use with the
NPB-3900 patient monitor. The P-3900 communicates with the monitor using a
null-modem cable connected between each device’s RS-232 connector. The
P-3900 contains an internal battery, which, when fully charged, will operate the
printer for 3 hours (typical, at 25°C, producing fifteen 20-second printouts per
hour). The P-3900 can be connected to AC power using an external power
supply. The P-3900 uses the same type power supply as the NPB-3900 monitor,
the PS-120V or PS-240V.
The P-3900 does not have an On/Off switch. The printer can sense when it has
an established communications link with the monitor. At that time, the green
LINKED indicator on the front panel lights, indicating that the printer is ready
for operation. See the NPB-3900 operator’s manual for more information
regarding use of the printer.
1.5 RELATED DOCUMENTS
To perform test and troubleshooting procedures and to understand the principles
of operation and circuit analysis sections of this manual, you must know how to
operate the monitor. Refer to the NPB-3900 operator’s manual. To understand
the various Nellcor Puritan Bennett sensors, ECG leads, blood pressure cuffs,
and temperature probes that work with the monitor, refer to the operator’s
manual and individual directions for use that accompany these accessories.
1-2
SECTION 2: ROUTINE MAINTENANCE
2.1 Cleaning
2.2 Periodic Safety and Functional Checks
2.3 Battery
2.4 Environmental Protection
2.1 CLEANING
WARNING: Do not spray, pour, or spill liquid on the NBP-3900, its
accessories, connectors, switches, or openings in the chassis. Do not immerse
the NPB-3900 or its accessories in liquid or clean with caustic or abrasive
cleaners.
To clean the NPB-3900, dampen a cloth with a commercial, nonabrasive cleaner
and wipe the exterior surfaces lightly. Do not allow any liquids to come in
contact with the power connector or switches. Do not allow any liquids to
penetrate connectors or openings in the instrument. For cables, sensors, and
cuffs, follow the cleaning instructions in the directions for use that accompany
these accessories.
2.2 PERIODIC SAFETY AND FUNCTIONAL CHECKS
Nellcor Puritan Bennett recommends that the following checks be performed at
least every 2 years by a qualified service technician.
1.
Inspect the exterior of the NPB-3900 for damage.
2.
Inspect labels for legibility. If the labels are not legible, contact Nellcor
Puritan Bennett’s Technical Services Department or your local Nellcor
Puritan Bennett representative.
3.
Verify that the unit performs properly as described in paragraph 3.3.
4.
Perform the electrical safety tests detailed in paragraph 3.4. If the unit fails
these electrical safety tests, do not attempt to repair. Contact Nellcor Puritan
Bennett’s Technical Services Department or your local Nellcor Puritan
Bennett representative.
2.3 BATTERY
If the NPB-3900 has not been used for a long period of time, the battery will
need charging. To charge the battery, connect the NPB-3900 to an AC source as
described in the Setup & Use section of the operator’s manual.
NOTE: Storing the NBP-3900 for a long period without charging the battery
may degrade the battery capacity. A complete battery recharge when
not using the monitor requires 8 hours. The battery may be recharged
while the monitor is in use; in which case, the battery will require 14
hours to be recharged. The battery may require a full charge/discharge
cycle to restore normal capacity.
2-1
Section 3: Performance Verification
Nellcor Puritan Bennett recommends that the NPB-3900’s sealed, lead-acid
battery be replaced at 2-year intervals. Refer to Section 6, Disassembly Guide.
2.4 ENVIRONMENTAL PROTECTION
Follow local governing ordinances and recycling plans regarding disposal or
recycling batteries and other device components.
2-3
SECTION 3: PERFORMANCE VERIFICATION
3.1 Introduction
3.2 Equipment Needed
3.3 Performance Tests
3.4 Safety Tests
3.1 INTRODUCTION
This section discusses the tests used to verify performance following repairs or
during routine maintenance. All tests can be performed without removing the
NPB-3900 covers.
If the NPB-3900 fails to perform as specified in any test, repairs must correct the
problem before the monitor is returned to the user.
3.2 EQUIPMENT NEEDED
Table 3-1 lists the equipment required for performance verification.
Table 3-1: Required Test Equipment
Equipment
Description
Digital multimeter (DMM)
Fluke Model 87 or equivalent
Sensor extension cable
EC-8
Durasensor® finger clip sensor
DS-100A
Oxisensor® II adhesive sensor
D-25
ECG cable
CE-10
ECG electrodes
Standard
ECG leads
LE series
NIBP hose
SHBP-10
NIBP cuff
SCBP series
Temperature probe
Welch Allyn SureTemp® (blue capped
probe)
Pulse oximeter tester
Nellcor Puritan Bennett SRC-2
ECG simulator
Dynatech Nevada medSim 300 or
equivalent
NIBP simulator
Bio-Tek “BP Pump” or equivalent
Thermometer Calibrator Key
Welch Allyn Model 767
Safety analyzer
Bio-Tek 601 Pro or equivalent
Stopwatch
Manual or electronic
3-1
Section 3: Performance Verification
3.3 PERFORMANCE TESTS
The battery charge and battery performance tests should be performed before
monitor repairs whenever the battery is suspected as being a source of a problem.
All other tests should be performed following monitor repairs. Before
performing the battery performance test, ensure that the battery is fully charged
(paragraph 3.3.1).
This section is written using Nellcor Puritan Bennett factory-set power-up
defaults. If your institution has reconfigured custom defaults, those values will
be displayed.
3.3.1 Battery Charge
Perform the following procedure to fully charge the battery.
1.
Connect the monitor to an AC power source using the PS-120 or PS-240
external power supply and power cord, if needed.
2.
Verify that the EXTERNAL POWER indicator is lit.
3.
Charge the battery for at least 8 hours. The battery may require a complete
charge/discharge cycle to restore its normal capacity.
4.
To check for a full charge, perform the procedure in paragraph 3.3.2
“Battery Performance Test.”
3.3.2 Battery Performance Test
The monitor is specified to operate typically on battery power for a minimum of
4 hours, at 25°C, with one NIBP measurement every 15 minutes. Before
performing this test, ensure that the battery is fully charged (paragraph 3.3.1).
3- 2
1.
Connect the Nellcor Puritan Bennett SRC-2 pulse oximeter tester to the
monitor via the EC-8 sensor cable. Connect the NIBP simulator to the
monitor via the SHBP-10 hose.
2.
Set the SRC-2 switches as follows:
SWITCH
POSITION
RATE
38
LIGHT
LOW
MODULATION
LOW
RCAL/MODE
RCAL 63/LOCAL
3.
Set the NIBP simulator to simulate a pressure setting of 120/80 mmHg
and heart rate of 80 bpm.
4.
Ensure that the monitor is not connected to AC power.
Section 3: Performance Verification
5.
With the NPB-3900 turned off, press the ON/STANDBY button and
verify that the battery icon appears at the bottom of the display after the
power-on self-test is completed. The boxes in the battery icon should all
be filled, indicating the battery is charged.
6.
Verify that the monitor is responding to the SpO 2 simulator signal and
that the audible alarm is sounding. Use the knob to select the SpO 2
Menu and permanently silence the SpO2 audible alarm.
7.
Use the knob to select the NIBP Menu and set the Automatic
Measurement Interval to 15 minutes. Exit the menu and press the front
panel NIBP button to manually initiate the first NIBP measurement.
Subsequent NIBP measurements will be taken automatically every 15
minutes.
8.
The monitor must operate for at least 4 hours before the monitor
automatically powers down due to low battery condition.
9.
Verify that the low battery alarm occurs 15-30 minutes before the battery
fully discharges.
10.
Allow the monitor to operate until it automatically powers down due to
low battery condition. Verify that an audible alarm sounds when the
monitor automatically shuts down. Press the alarm silence button to
terminate this audible alarm.
11.
If the monitor passes this test, immediately recharge the battery
(paragraph 3.3.1, steps 1–3).
3.3.3 Power-On Self-Test
1.
Connect the monitor to an AC power source using the PS-120 or PS-240
power supply and power cord, and verify that the EXTERNAL POWER
indicator is lit.
2.
Do not connect any input cables to the monitor.
3.
Observe the monitor front panel. With the monitor off, press the
ON/STANDBY button. The monitor must perform the following sequence.
a.
The monitor emits a beep.
b.
A few seconds later, the display backlight illuminates, but the display
is blank.
c.
The Nellcor Puritan Bennett logo then appears for a few seconds,
with the version numbers of the boot and operational software
displayed in the lower left corner of the display. (The upper version
number corresponds to the boot software, the lower version number
corresponds to the operational software.)
d.
A beep signals the end of the power-on self-test. The power-on selftest takes approximately 10 seconds to complete.
e.
Upon successful completion of the power-on self-test, the display will
be in the normal monitoring screen configuration. No vital-sign
numeric values or trend values will be displayed.
3-3
Section 3: Performance Verification
3.3.4 Hardware and Software Tests
Hardware and software testing includes the following tests applicable to the
indicated models in the series.
•
3.3.4.1
SpO2 Testing  NPB-3900
•
3.3.4.2
Operation with an ECG Simulator — NPB-3930, NPB-3940
•
3.3.4.3
Verification of Pneumatic System — NPB-3900
•
3.3.4.4
Operation with a Temperature Simulator — NPB-3920, NPB-3940
•
3.3.4.5
General Operation — NPB-3900
3.3.4.1 SpO2 Testing (NPB-3900)
SpO2 testing includes the following tests.
•
3.3.4.1.1 Alarms and Alarm Silence
•
3.3.4.1.2 Heart Rate Tone Volume Control
•
3.3.4.1.3 Dynamic Operating Range
•
3.3.4.1.4 LED Excitation Test
3.3.4.1.1 Alarms and Alarm Silence
1.
2.
Connect the SRC-2 pulse oximeter tester to the EC-8 sensor extension cable
and connect the cable to the monitor. Set the SRC-2 as follows:
SWITCH
POSITION
RATE
38
LIGHT
LOW
MODULATION
OFF
RCAL/MODE
RCAL 63/LOCAL
Press the ON/STANDBY button to turn the monitor on. After the normal
power-up sequence, verify that the SpO2% display initially indicates zero
or is blank.
NOTE: The pulse bar may occasionally indicate a step change as the monitor is
in the pulse search mode.
3.
Move the modulation switch on the SRC-2 to LOW.
4.
Verify the following monitor reaction:
a. The pulse bar begins to track the artificial pulse signal from the SRC-2.
3- 4
b.
Initially, zero is displayed in the SpO2 frame, or it is blank.
c.
After about 10 to 20 seconds, the monitor displays saturation and heart
rate as specified by the tester. Verify that the values are within the
following tolerances:
Oxygen Saturation Range 79% to 83%
Heart Rate Range 35 to 41 bpm
Section 3: Performance Verification
d.
The audible alarm sounds and both the SpO2% and HEART RATE
displays flash, indicating both parameters have violated the default
alarm limits.
e.
The heart rate tone is heard. (Heart rate tone source, found in the
Heart Rate Menu, should be set to “SpO 2”.)
5. Press the ALARM SILENCE button on the front panel of the monitor. The
audible alarm is temporarily silenced.
6. Verify the following:
a.
The audible alarm remains silenced.
b.
The “slashed bell” icon appears in each numeric frame on the display.
c.
The SpO2% and HEART RATE displays continue flashing.
d.
The heart rate tone remains audible.
e.
The audible alarm returns in approximately
60 seconds.
3.3.4.1.2 Heart Rate Tone Volume Control
Connect the SRC-2 pulse oximeter tester to the EC-8 sensor extension cable and
connect the cable to the monitor. Set the SRC-2 as follows:
SWITCH
POSITION
RATE
38
LIGHT
LOW
MODULATION
LOW
RCAL/MODE
RCAL 63/LOCAL
1.
Power on the monitor and verify that the SpO2 and heart rate values are
correctly displayed. Press the ALARM SILENCE button on the front panel
of the monitor to temporarily silence the audible alarm.
2.
Verify that the heart rate tone source, found in the Heart Rate Menu, is set
to “SpO2”. Press the VOLUME button on the front panel of the monitor.
Within 3 seconds of having pressed the button, rotate the knob CW and
verify that the beeping heart rate tone sound level increases.
3.
Rotate the knob CCW and verify that the beeping heart rate tone decreases
until it is no longer audible. Rotate the knob CW to return the beep volume
to a comfortable level. (Note that 3 seconds after the last button-press or
rotation of the knob, function of the knob reverts to moving the highlight
on the display screen.)
3-5
Section 3: Performance Verification
3.3.4.1.3 Dynamic Operating Range
The following test sequence verifies proper monitor operation over a range of
input signals.
1.
Connect the SRC-2 to the NPB-3900 (using an EC-8) and turn the
NPB-3900 on.
2.
Place the SRC-2 in the RCAL 63/LOCAL mode.
3.
Set the SRC-2 as indicated in Table 3-2. Verify that the NPB-3900
readings are within the indicated tolerances. Allow the monitor several
seconds to stabilize the readings.
NOTE: A “*” indicates values that produce an alarm. Press the ALARM
SILENCE button to temporarily silence the audible alarm.
Table 3-2: SRC Settings and NBP-3900 Indications
SRC-2 Settings
RATE
38
112
201
201
LIGHT
HIGH2
HIGH1
LOW
LOW
MODULATION
LOW
HIGH
LOW
HIGH
NPB-3900 Indications
SpO2
79 - 83*
79 - 83*
79 - 83*
79 - 83*
Pulse Rate
35 - 41*
109 - 115
195 - 207*
195 - 207*
NOTE: For the pulse rate setting of 201 bpm, the pulse rate tolerance of 195 to
207 bpm is greater than the ±3 bpm accuracy specification of the
monitor, due to the performance characteristics of the SRC-2 tester.
4.
Turn the monitor off.
3.3.4.1.4 LED Excitation Test
This procedure uses normal system components to test circuit operation. A
Nellcor Puritan Bennett Oxisensor II adhesive sensor, model D-25, is used to
examine LED intensity control. The red LED is used to verify intensity
modulation caused by the LED intensity control circuit.
3- 6
1.
Connect an EC-8 sensor extension cable to the monitor.
2.
Connect a D-25 sensor to the sensor extension cable.
3.
Press the ON/STANDBY button to turn the monitor on.
4.
Leave the sensor open with the LED and photodetector visible.
5.
After the monitor completes its normal power-up sequence, verify that the
sensor LED is brightly lit.
Section 3: Performance Verification
6.
Slowly move the sensor LED in proximity to the photodetector element of
the sensor. Verify, as the LED approaches the optical sensor, that the LED
intensity decreases.
7.
Open the sensor and notice that the LED intensity increases.
8.
Repeat step 6 and the intensity again decreases. This variation is an
indication that the microprocessor is in proper control of LED intensity.
9.
Turn the NPB-3900 off.
3.3.4.2 Operation with an ECG Simulator (NPB-3930, NPB-3940)
1.
2.
With the monitor off, connect the ECG leads to the appropriate jacks on
the ECG tester.
Connect the leads to the CE-10 ECG cable. Connect the CE-10 to the ECG
input port on the NPB-3900. Set the ECG tester as follows:
Heart rate:
30 bpm
Amplitude:
1 millivolt
Lead select:
II
Normal sinus rhythm
Adult mode
NOTE: The accuracy of the monitor’s ECG measurements is ±5 bpm. In the
procedure below, add the tolerance of the simulator to the acceptable
range of readings.
3.
Press the ON/STANDBY button to turn the monitor on. After the normal
power-up sequence, verify the following monitor reactions:
a.
After at least five heartbeats, the monitor displays a heart rate of
30 ±5 bpm.
b.
The audible alarm sounds and the HEART RATE display flashes,
indicating the heart rate is below the default lower alarm limit.
4.
Press the ALARM SILENCE button. Verify that the audible alarm is
silenced.
5.
Increase the heart rate setting on the ECG simulator to 240 bpm.
6.
After at least five heartbeats, verify that the monitor displays a heart rate
of 240 ±5 bpm.
7.
Verify that the audible alarm sounds and the HEART RATE display
flashes, indicating that the heart rate is above the default upper alarm limit.
8.
Press the ALARM SILENCE button to silence the alarm.
3-7
Section 3: Performance Verification
9.
Decrease the heart rate setting on the ECG simulator to 120 bpm.
10. After at least five heartbeats, verify that the monitor displays a heart rate
of 120 ±5 bpm.
11. Disconnect the LL lead from the ECG simulator. Verify that the “Leads
Off” alarm message appears, three dashes are displayed in the HEART
RATE display, and a low priority audible alarm sounds.
12. Reconnect the LL lead to the ECG simulator. Verify that the “Leads Off”
alarm message no longer appears and that the audible alarm is silenced.
13. Repeat steps 11 and 12 for the LA and RA leads.
14. Turn the monitor off.
3.3.4.3 Verification of Pneumatic System (NPB-3900)
Tests in paragraphs 3.3.4.3.1 through 3.3.4.3.5 verify the functionality of the
NPB-3900 pneumatic system. These tests were designed to use the Bio-Tek “BP
Pump” noninvasive blood pressure simulator. The internal test volume of the
Bio-Tek simulator is 250 cm , which is used to calculated the inflation/deflation
rate periods. The Bio-Tek simulator, or any equivalent NIBP simulator, is
required to perform these tests.
3
The NPB-3900 must be placed in Diagnostic Mode, with the NIBP Test screen
active for each of the NIBP tests. For a detailed explanation of the Diagnostic
Mode, refer to Section 4, Power-up Defaults Menu and Diagnostic Mode.
Each of the tests described in paragraphs 3.3.4.3.1 through 3.3.4.3.5 must be
performed to verify pneumatic system functionality. These tests can be
performed individually (in any order) or sequentially. Prior to performing any of
these tests, perform the following setup procedure. If these tests are performed in
sequence, this procedure needs to be performed once prior to the first test.
1.
Turn on the Bio-Tek simulator and press the MODE button to place the
simulator in test mode. The simulator screen will indicate “Internal Cuff”
and “Pressure Gauge”.
2.
Connect the simulator hose to the NIBP connector on the NPB-3900.
3.
Follow the procedure described in Section 4 to place the NPB-3900 in
Diagnostic Mode with the NIBP Test screen active.
3.3.4.3.1 Pressure Transducer Accuracy
The pressure transducer accuracy test verifies the pressure accuracy of the
NBP-3900 pressure transducer.
3- 8
Section 3: Performance Verification
1.
Confirm that the Bio-Tek simulator is in test mode. The simulator should
display “Pressure Gauge”. Confirm that the simulator is set up for the
internal cuff.
2.
Confirm that the NIBP Test screen is active on the NPB-3900. Press, then
release, the SPEAKER button on the NPB-3900 to verify that the valve is
closed.
3.
Press the CONTRAST button on the NPB-3900, then the ZERO button on
the simulator, to perform an offset adjustment so that the simulator and
NBP-3900 both display a pressure of 0 mmHg.
4.
Press the SELECT button on the simulator until the simulator displays
“Pressure Source Set Test Pressure”. Use the UP/DOWN buttons on the
simulator to adjust for 250 mmHg.
5.
Press the START PUMP button on the simulator. The simulator will begin
to pressurize. The current pressure in mmHg is displayed on both the
simulator and NPB-3900 displays.
6.
Allow 15-20 seconds for the pressure to stabilize. The pressure displayed
on the NPB-3900 and the simulator should be within 5 mmHg of one
another to complete the test successfully.
7.
Press the STOP PUMP button on the simulator to stop the test.
8.
Press and hold the SPEAKER button until the NPB-3900 displays a
pressure of 0 mmHg.
9.
Additional NIBP tests may be performed at this time. If no further NIBP
tests are to be conducted, turn the NPB-3900 off. Normal monitoring
operation will return the next time the monitor is turned on.
3.3.4.3.2 Pneumatic Leakage
The pneumatic leakage test verifies the integrity of the pneumatic system. A
timer/stopwatch is required for this test.
1.
Ensure that the Bio-Tek simulator is in test mode. The simulator should
display “Pressure Gauge”. Confirm that the simulator is set up for the
internal cuff.
2.
Ensure that the NIBP Test screen is active on the NPB-3900. Press, then
release, the SPEAKER button on the NPB-3900 to verify that the valve is
closed.
3.
Press the CONTRAST button on the NPB-3900, then the ZERO button on
the simulator, to perform an offset adjustment so that the simulator and
NBP-3900 both display a pressure of 0 mmHg.
3-9
Section 3: Performance Verification
4.
Press the NIBP button on the NPB-3900 to activate the pump. Hold the
button until the NPB-3900 displays a pressure of approximately 250 mmHg.
Allow 15-20 seconds for the pressure to stabilize. Record the pressure
displayed on the monitor, and initiate a 1-minute timer. After 1 minute,
again record the pressure displayed. The test is successfully completed if
the pressure has dropped by 6 mmHg, or less, during the 1-minute period.
5.
Press and hold the SPEAKER button until the NPB-3900 displays a
pressure of 0 mmHg.
6.
Additional NIBP tests may be performed at this time. If no further NIBP
tests are to be conducted, turn the NPB-3900 off. Normal monitoring
operation will return the next time the monitor is turned on.
3.3.4.3.3 Inflation Rate
The inflation rate test verifies the inflation rate of the NPB-3900. A
timer/stopwatch is required for this test.
1.
Ensure that the Bio-Tek simulator is in test mode. The simulator should
display “Pressure Gauge”. Confirm that the simulator is set up for the
internal cuff.
2.
Ensure that the NIBP Test screen is active on the NPB-3900. Press, then
release, the SPEAKER button on the NPB-3900 to verify that the valve is
closed.
3.
Press the CONTRAST button on the NPB-3900, then the ZERO button on
the simulator, to perform an offset adjustment so that the simulator and
NBP-3900 both display a pressure of 0 mmHg.
4.
Press the NIBP button on the NPB-3900 to activate the pump, and
simultaneously start the timer. Hold the NIBP button until the monitor
displays a pressure of 280 mmHg. When a pressure of 280 mmHg is
reached, stop the timer. The test is successfully completed if the inflation
time is between 1 and 6 seconds.
5.
Press and hold the SPEAKER button until the NPB-3900 displays a
pressure of 0 mmHg.
6.
Additional NIBP tests may be performed at this time. If no further NIBP
tests are to be conducted, turn the NPB-3900 off. Normal monitoring
operation will return the next time the monitor is turned on.
3.3.4.3.4 Deflation Rate
The deflation rate test verifies the deflation rate of the NPB-3900. A timer/stop
watch is required for this test.
1. Ensure that the Bio-Tek simulator is in test mode. The simulator should
display “Pressure Gauge”. Confirm that the simulator is set up for the
internal cuff.
3- 10
Section 3: Performance Verification
2. Ensure that the NIBP Test screen is active on the NPB-3900. Press, then
release, the SPEAKER button to verify that the valve is closed.
3. Press the CONTRAST button on the NPB-3900, then the ZERO button on
the simulator, to perform an offset adjustment so that the simulator and
NBP-3900 both display a pressure of 0 mmHg.
4. Press the NIBP button on the NPB-3900 to activate the pump. Hold the
button until the NPB-3900 displays a pressure of 280 mmHg. Initiate a
1-minute timer, and simultaneously press and hold the ALARM SILENCE
button on the NPB-3900. This will cause the pneumatic system to deflate at
a rate of 3 mmHg/sec ±1.5 mmHg/sec. After 1 minute, record the pressure
displayed on the NPB-3900. The test is successfully completed if the
monitor displays a pressure reading of 10 mmHg to 190 mmHg.
5. Press and hold the SPEAKER button until the NPB-3900 displays a
pressure of 0 mmHg.
6. Additional NIBP tests may be performed at this time. If no further NIBP
tests are to be conducted, turn the NPB-3900 off. Normal monitoring
operation will return the next time the monitor is turned on.
3.3.4.3.5 Over-pressure
The over-pressure test verifies the functionality of the over-pressure relief
system of the NPB-3900.
1.
Ensure that the Bio-Tek simulator is in test mode. The simulator should
display “Pressure Gauge”. Confirm that the simulator is set up for the
internal cuff.
2.
Ensure that the NIBP Test screen is active on the NPB-3900. Press, then
release, the SPEAKER button on the NPB-3900 to verify that the valve is
closed.
3. Press the CONTRAST button on the NPB-3900, then the ZERO button on
the simulator, to perform an offset adjustment so that the simulator and
NBP-3900 both display a pressure of 0 mmHg.
4. Press the SELECT button on the simulator until the simulator displays
“Overpressure Test”. Press the START TEST button on the simulator. The
simulator will pressurize the system until the monitor’s over-pressure relief
system activates, including the warning display screen. The simulator will
display the pressure value that caused the NPB-3900 over-pressure relief
system to activate. The test is successfully completed if the simulator
displays a pressure reading of 280 mmHg to 330 mmHg.
5. Press and hold the SPEAKER button to ensure that the NPB-3900 displays a
pressure of 0 mmHg.
6. Additional NIBP tests may be performed at this time. If no further NIBP
tests are to be conducted, turn the NPB-3900 off. Normal monitoring
operation will return the next time the monitor is turned on.
3-11
Section 3: Performance Verification
3.3.4.4 Operation with a Thermometer Calibration Key (Models 3920 and 3940)
1.
Remove the probe from its holder.
2.
Insert the calibration key in the temperature input port T on the NPB-3900.
3.
Press the ON/STANDBY button to turn the monitor on. After the normal
power-up sequence, verify that the temperature reads 36.3 ±0.1 °C (or 97.3
±0.2 °F).
4.
Turn the monitor off.
3.3.4.5 General Operation
The following tests provide an overall performance check of the system:
•
3.3.4.4.1
Operation with a Human Subject
•
3.3.4.4.2
Serial Interface Test
•
3.3.4.4.3
Printer Verification
3.3.4.5.1 Operation with a Human Subject
Patient monitoring involves connecting the monitor to a human subject for a
qualitative test.
3- 12
1.
Connect an EC-8 sensor extension cable to the monitor. Connect a
Nellcor Puritan Bennett Durasensor finger clip sensor, model DS-100A,
to the sensor extension cable. Clip the DS-100A to the subject as
described in the sensor directions for use.
2.
Connect a CE-10 ECG cable to the NPB-3930 or NPB-3940. Connect
ECG leads to the cable. Connect ECG electrodes to the leads. Apply ECG
electrodes to the subject according to the lead’s and electrodes’ directions
for use.
3.
Connect an SHBP-10 blood pressure hose to the monitor. Apply the
appropriate SCBP series blood pressure cuff to the subject according to
the cuff directions for use.
4.
Connect a blue-capped SureTemp oral thermometer probe to the
NPB-3920 or NPB-3940. Place the probe in its holder in the module on
the rear of the monitor.
5.
Press the ON/STANDBY button to turn the monitor on and verify that
the monitor is operating.
6.
The monitor should stabilize on the subject’s physiological signals in
about 15 to 30 seconds. Verify that the saturation and heart rate are
reasonable for the subject.
7.
Press the NIBP button on the front panel of the monitor. Verify that the
blood pressure values are reasonable for the subject.
Section 3: Performance Verification
8.
Remove the temperature probe from its holder. Following the directions
in the NPB-32900 operator’s manual, apply a new probe cover and take
the subject’s temperature. Verify that the temperature measurement is
reasonable for the subject.
3.3.4.5.2 Serial Interface Test
RS-232
Perform the following procedure to test the serial port voltages. The test is
qualitative and only verifies that the serial interface port is powered correctly,
and that the “nurse call” signal is operational. The serial connector is a male
DB-9 located on the monitor’s rear panel, identified with the RS-232 symbol.
1.
Turn the monitor ON.
2.
Set up the DMM with the function set to “VDC” at a range of 10 volts.
3.
Connect the DMM negative lead to connector pin 5 (GND), or the shell of
the RS-232 connector.
4.
Connect the DMM positive lead to the following pins, in turn, and verify
the voltage values listed in Table 3-3. (Voltage for pin 9 is that listed for the
“no alarm” condition.)
Table 3-3: Serial Interface Measurements
Pin
1
2
3
4
5
6
7
8
9
9
Signal
not used
RXD <<<
TXD >>>
DTR >>>
GND
DSR <<<
RTS >>>
CTS <<<
Alarm Out >>>
(no alarm)
Alarm Out >>>
(alarm underway)
Measurement (V)
Min
Typical
Max
-0.4
0.0
0.4
-0.4
0.0
0.4
-5.0
-9.0
-15.0
-5.0
-9.0
-15.0
-0.4
0.0
0.4
-0.4
0.0
0.4
-5.0
-9.0
-15.0
-0.4
0.0
0.4
-5.0
-9.0
-15.0
5.0
9.0
15.0
5. Connect the Nellcor Puritan Bennett SRC-2 pulse oximeter tester to the
monitor via the EC-8 sensor extension cable.
3-13
Section 3: Performance Verification
6.
Set the SRC-2 switches as follows:
SWITCH
POSITION
RATE
38
LIGHT
LOW
MODULATION
LOW
RCAL/MODE
RCAL 63/LOCAL
7.
Verify that the monitor is responding to the SpO 2 simulator signal and the
audible alarm is sounding. If desired, press the ALARM SILENCE button
to temporarily silence the audible alarm.
8.
Connect the DMM positive lead to pin 9 and verify the voltage value listed
in Table 3-3. (Voltage for pin 9 is that listed for the “alarm underway”
condition.)
3.3.4.5.3 Printer Verification (For Optional Printer)
Printer verification consists of connecting the printer to the monitor and the
monitor to a human subject for a qualitative test.
15V - 1A
RS-232
1. Connect the output of the appropriate power supply, PS-240V or PS-120V,
to the labeled connector in the rear of the printer. When the printer’s external
power supply is connected, the printer front-panel charging LED is lighted.
2. Connect the serial cable between the labeled connectors in the rear panels of
the monitor and the printer.
3. The printer front-panel communication LED is lighted when the RS-232
communications link is completed.
4. Rotate the monitor knob to highlight the setup icon . Press the knob and
ensure Communications Selection is (Printer).
5. Connect an EC-8 sensor extension cable to the monitor. Connect a Nellcor
Puritan Bennett Durasensor oxygen transducer, model DS-100A, to the
sensor extension cable. Attach the DS-100A to the subject as described in
the sensor directions for use.
6. Press the ON/STANDBY button to turn the monitor on and verify that the
monitor is operating.
7. The monitor should stabilize on the subject’s physiological signal in about
15 to 30 seconds. Verify that the saturation and heart rate is reasonable for
the subject.
3- 14
Section 3: Performance Verification
8. Press the printer CONTINUOUS BUTTON. Verify that the printout contains
vital signs across the top of the paper, and that aSpO 2 waveform, with grid
marks, occupies the center portion of the paper. Press the CONTINUOUS
BUTTON again to terminate printout.
9. Disconnect the sensor and shut off the monitor.
3.4 SAFETY TESTS
NPB-3900 safety tests consist of the following Leakage Currents elements,
performed in accordance with IEC 601-1.
3.4.1 Protective Ground Continuity
NOTE: The NPB-3900 does not require an isolated Earth Ground terminal,
neither is one installed. No Protective Ground Continuity check is
required.
3.4.2 Electrical Leakage
NPB-3900 leakage current tests consist of the following elements, performed in
accordance with IEC 601-1, clause 19:
•
Patient Leakage Current
•
Patient Leakage Current, with Mains Voltage on the Applied Part
3.4.2.1 Patient Leakage Current
This test measures patient leakage current in accordance with IEC 601-1, clause
19, for Class II, type CF equipment. Patient leakage current in this test is
measured from any individual patient connection to earth (power ground).
NOTE: This test requires a test cable for each patient connector. For example,
the ECG test cable consists of the ECG cable connector, with all the
conductors shorted together, connected to a test lead from the electrical
safety analyzer. Test cables for SpO2 and temperature can be configured
in a similar manner.
1.
Configure the electrical safety analyzer as recommended by the analyzer
operating instructions.
2.
Connect the appropriate external power supply input power cord to the
analyzer as recommended by the analyzer operating instructions. Connect
the external power supply output cord to the monitor.
3.
Connect the ECG test cable to the ECG connector on the NPB-3930 /3940
and the appropriate input connector on the analyzer. Turn on the
NPB-3930/3940.
4.
Perform the test as recommended by the analyzer operating instructions.
Patient leakage current is measured under various conditions of the AC
mains. For each condition, the measured leakage current must not exceed
that indicated in Table 3-4.
3-15
Section 3: Performance Verification
5.
Repeat the test for the SpO 2 and temperature patient connections, using the
appropriate test cables.
Table 3-4: Current Test
Test Condition
Allowable Leakage
Current (milliamps)
Normal polarity
0.01
Normal polarity; Neutral (L2) open
0.05
Reverse polarity
0.01
Reverse polarity; Neutral (L2) open
0.05
3.4.1.3 Patient Leakage Current, with Mains Voltage on the Applied Part
This test measures patient leakage current in accordance with IEC 601-1, clause
19, for Class II, type CF equipment. In this test, 110% of mains voltage is
applied between each patient connection and earth (power ground). Patient
leakage current is then measured from any individual patient connection to earth.
NOTE: This test requires the same test cables for each patient connector as
described in section 3.4.1.2.
WARNING: AC mains voltage will be present on the applied part
terminals during this test. Exercise caution to avoid electrical shock hazard.
1.
Configure the electrical safety analyzer as recommended by the analyzer
operating instructions.
2. Connect the monitor’s appropriate external power supply input power cord
to the analyzer as recommended by the analyzer operating instructions.
Connect the external power supply output cord to the monitor.
3. Connect the ECG test cable to the ECG connector on the NPB-3930/3940
and the appropriate input connector on the analyzer. Turn on the
NPB-3930/3940.
4. Perform the test as recommended by the analyzer operating instructions.
Patient leakage current is measured with normal and reverse mains polarity.
For each condition, the measured leakage current must not exceed that
indicated in Table 3-5.
5. Repeat the test for the SpO 2 and temperature patient connections, using the
appropriate test cables.
Table 3-5: Leakage Current
Allowable Leakage
Test Condition
Current (milliamps)
Normal polarity
0.05
Reverse polarity
0.05
3- 16
SECTION 4: POWER-UP DEFAULTS MENU AND DIAGNOSTIC MODE
4.1 Introduction
4.2 Power-up Defaults Menu
4.3 Restoring Factory Settings
4.4 Diagnostic Mode
4.1 INTRODUCTION
This section discusses use of the Power-up Defaults Menu to configure power-on
default settings, and the Diagnostic Mode to obtain service-related information
about the monitor.
4.2 POWER-UP DEFAULTS MENU
The purpose of the Power-up Defaults Menu (Table 4-1) is to allow the
authorized user to create a “power-up default” for each setting in the NPB-3900.
Power-up defaults are the settings in effect each time the NPB-3900 is powered
on. Once the Power-up Defaults Menu is entered, physiological monitoring is
terminated. The screen layouts do NOT display any information associated with
normal monitoring operation.
Use the following procedure to configure the power-up default settings for the
NPB-3900 monitor.
1.
While in normal monitoring mode, adjust each accessible setting on the
monitor as desired, using the techniques described in the operator’s manual.
Such settings include alarm limits, choice of display type for the graphic
frame, and ECG lead select.
2.
Use the knob to invoke the Set-up Menu (choose the screwdriver icon found
along the bottom of the display).
3.
Select the menu item “Enter Power-Up Defaults Menu”. Once selected, a
pop-up box appears with the text “Enter 3-Digit Passcode”. Use the knob to
enter the passcode, 2 1 5. This passcode is set at the factory and may not be
changed.
4.
The Power-up Defaults Menu is now present. The available menu items are
explained in the table that follows. Make changes to these menu items as
desired.
Table 4-1: Power-Up Defaults Menu
MENU ITEM*
Accept Current
Settings?
CHOICES**
“Yes”
“No”
EXPLANATION
If “Yes” is chosen, the current
NPB-3900 settings become the
power-up defaults.
4-1
Section 4: Power-up Defaults Menu and Diagnostic Mode
Table 4-1: Power-Up Defaults Menu - (Continued)
MENU ITEM*
CHOICES**
Permanent Audible “Make Available”
Alarm Silence
“Deny Access”
If “Make Available” is chosen,
the caregiver may permanently
silence the audible alarm for a
particular parameter via the
Alarm/Limits Menu. Some
institutions may wish to prevent
audible alarms from being
permanently silenced. If so,
“Deny Access” should be
selected.
Alarm Suspend
If “Make Available” is chosen,
the caregiver may invoke the
Alarm Suspend Mode by
pressing and holding the Alarm
Silence button for 2 seconds.
Some institutions may wish to
prevent Alarm Suspend from
being invoked. If so, “Deny
Access” should be selected.
“Make Available”
“Deny Access”
Auto-Set Limits
“Make Available”
“Deny Access”
4-2
EXPLANATION
If “Make Available” is chosen,
the caregiver may invoke the
Auto-Set Limits function via
the Alarm/Limits Menu. Some
institutions may wish to prevent
Auto-Set Limits from being
invoked. If so, “Deny Access”
should be selected.
Section 4: Power-up Defaults Menu and Diagnostic Mode
Table 4-1: Power-Up Defaults Menu - (Continued)
MENU ITEM*
Language
CHOICES**
“English”
“Français”
“Deutsch”
“Español”
EXPLANATION
The language selected will be
used for all the text shown on
the display; the selected
language will be effective the
next time the monitor is
powered up.
“Italiano”
“Portugués”
“Japanese”
“Chinese”
“Russian”
Enter Diagnostic
Mode
“Yes”
“No”
Done
If “Yes” is chosen, the Powerup Defaults Menu is exited and
the Diagnostic Menu appears.
When selected, the Power-up
Defaults Menu is immediately
exited and the user is instructed
to power down the monitor.
* The choice in effect at the time the screen is accessed is shown
in parentheses following the menu item.
** Bold type indicates the choice when the factory-set default menu
appears. The highlighting is displayed in reverse video.
5. After making any desired changes to the menu items, choose the menu item
“Accept current settings?”, select “YES”, then select “Done”.
6. Upon selecting “Done”, a Notice screen will appear, with the directions that
the monitor must be powered off, and that any changes made to the power-up
defaults will be in effect next time the unit is powered up.
4-3
Section 4: Power-up Defaults Menu and Diagnostic Mode
NOTICE
Turn off the monitor at this time. Any changes
made to the power-up defaults will be in effect
the next time the monitor is turned on.
4.3 RESTORING FACTORY SETTINGS
CAUTION: In addition to restoring factory defaults, this procedure will
also clear the contents of trend memory.
NOTE: Read this procedure completely before performing the first step.
The following technique can be used to restore the monitor’s power-up default
settings which were originally established at the factory:
1. With the monitor powered off, simultaneously press the Volume and
Contrast buttons on the front keypad.
2. While continuing to press the Volume and Contrast buttons, power-up the
monitor.
3. Continue to keep the Volume and Contrast buttons depressed until the
power-up diagnostic sequence is complete. When the normal monitoring
screen appears, release the two buttons.
4.4 DIAGNOSTIC MODE
The purpose of Diagnostic Mode is to allow factory, field-service, and hospital
biomedical technicians access to a series of test and system-related information
screens for the purpose of verifying NPB-3900 performance or troubleshooting
problems.
To access the Diagnostic Mode, first invoke the Power-up Defaults Menu as
described in section 4.2. Then, select the menu item, “Enter Diagnostic Mode”.
Choose “Yes”. The Power-up Defaults Menu will be exited and the Diagnostic
Menu will appear.
4-4
Section 4: Power-up Defaults Menu and Diagnostic Mode
DIAGNOSTIC MENU
Error Codes
System Information
System A/D Values
NIBP Test
Return
The Diagnostic Menu lists the test and system-related information screens.
Selection of an item in the menu will invoke that test or information screen. The
test and information screens that appear in the Diagnostic Menu are as follows:
•
Error Codes
•
System Information
•
System A/D Values
•
NIBP Test
•
Return
4.4.1 Error Codes
This screen displays the 10 most recent error code types, logged by the
NPB-3900. After 10 error code types have been logged, the oldest error code
type will be deleted as new error code types are added. Adjacent to each error
code will be an entry which is the number of occurrences of that error. This
means that if there are many occurrences of one type of error code, that one error
code won’t “overwrite” the other 9 error codes.
Next to the occurrence field is the time and date of the most recent occurrence of
the error code. Error codes may not be changed or reset in this screen. When in
the Error Code screen, the “Return” item is always highlighted; a press of the
knob will return the user to the Diagnostic Menu. Rotating the knob while in the
Error Code screen will have no effect.
NOTE: Refer to Section 5.6.2 for more detail on error codes.
4-5
Section 4: Power-up Defaults Menu and Diagnostic Mode
4.4.2 System Information
SYSTEM INFORMATION
Monitor On-Time
1563
Backlight On-Time
Battery Deep
Discharges
871
152
System Software
Version
SpO2 Software Version
V 2.01
Nellcor MP204/205
V1.1.0.6 10/06/95
Return
This screen displays several system-related items:
•
Monitor On-time: Displays the number of hours, rounded to the nearest
hour, that the Main PCB has been operational. This value may not be reset.
(See Note 1.)
NOTE 1:
Monitor on-time, backlight on-time, and battery deep
discharge values are stored in nonvolatile memory.
When a new Main PCB is installed, this value will be
set at zero.
•
Backlight On-time: Displays the number of hours, rounded to the nearest
hour, that the LCD Backlight has been operational. This value may be reset
to zero, for instance, when a technician changes the backlight or installs a
new LCD. (See Note 1.)
•
Battery Deep Discharges: Displays the number of deep-discharge cycles
seen by the battery. The monitor records a deep discharge cycle when the
battery voltage reaches 5.6 V, the voltage at which a “Low Battery” alarm is
issued. This value may be reset to zero, for instance, when a technician
installs a new battery. (See Note 1.)
•
System software version: Displays the revision level of the system
software. This revision level is also momentarily shown on the LCD as part
of the Copyright screen. This value may not be changed by the user.
•
SpO2 software version: Displays the revision level of the software of the
SpO2 EEPROM module. This value may not be changed by the user.
When in the System Information screen, the knob may be rotated to select any of
the “changeable” items. If one of those items is selected, a press of the knob will
cause a pop-up menu to appear. The first item in the pop-up will read “Make no
change”; the second item in the pop-up will read “Reset to zero”. Exiting the
screen is accomplished in the normal manner, by selecting “Return”.
4-6
Section 4: Power-up Defaults Menu and Diagnostic Mode
4.4.3 System A/D Values
SYSTEM A/D VALUES
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
1.478
0.235
3.652
0.782
4.012
0.045
2.149
1.025
0.478
1.369
0.702
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
1.478
0.235
3.652
0.782
4.012
0.045
2.149
1.025
0.478
SpO2 S1
S018
SpO2 S2
S0010
Return
This screen displays the current value of each analog-to-digital (A/D) channel, in
volts. Some of the channels are for AC-coupled signals (such as ECG input), so
the numbers on the screen will be constantly changing when an input signal is
present. These AC-coupled values indicate whether basic functionality of the
channel is present, but no significance can be derived from the values of the
numbers displayed. However, other A/D channels read DC voltages, (for
example, power supply voltages and battery voltage) so those voltage values
provide useful diagnostic information.
The Primary and Secondary Status messages from the SpO2 module will be
displayed and updated at the rate of about once per second. Presence of the
correct SpO2 message indicates that, at a basic level, communication between
the SpO2 module and the main monitor processor is working correctly. None of
the displayed values may be changed or reset in this screen. When in the System
A/D screen, the “Return” item is always highlighted; a press of the knob will
return the user to the Diagnostic Menu. Rotating the knob while in the System
A/D screen will have no effect. The A/D channel designators are shown in
Table 4-2.
Table 4-2: A/D Channel Designators
A/D CHANNEL DESIGNATOR
A/D CHANNEL DESIGNATOR
1.
ECG
12.
(BATTERY VOLTAGE) X 0.5
2.
RWAVE
13.
TEMP PROBE <=0=ORAL,
1=RECTAL,2=CAL KEY, >=3 NONE)
3.
PACEMAKER
14.
+3.3VDC POWER SUPPLY
4.
TEMP 1(93 ° TO 112°)
15.
(NIBP VOLTAGE REF) X 0.8
4-7
Section 4: Power-up Defaults Menu and Diagnostic Mode
Table 4-2: A/D Channel Designators - (Continued)
5.
PRESSURE XDUCER 1
16.
GROUND REFERENCE
6.
PRESSURE XDUCER 2
17.
(+5 VDC POWER SUPPLY) X 0.8
7.
NIBP OSCILLATORY
18.
ADC MID-SCALE VALUE
8.
ECG LEADS OFF
19.
ADC FULL-SCALE VALUE
9.
TEMP 2(59 ° TO 93°)
20.
ADC ZERO-SCALE VALUE
10.
ISOLATED VOLTAGE REF
21.
(NOT USED)
11.
ISOLATED VOLTAGE ZERO
SpO2 S1 S018
SpO2 S2 S010
4.4.4 NIPB Test
WARNING: Never apply an attached blood pressure cuff to a patient while
the monitor is in Diagnostic Mode. Injury could result.
NIBP TEST
Pressure
(mmHg)
Valve:
179
OPEN
Press “NIBP” to activate pump;
release to stop pump.
Press “Volume” to open valve; release
to close valve.
Press “Alarm Silence” to open
proportional valve and deflate at 3
mmHg/s; release to close valve.
Press “Contrast” to perform offset
adjust.
Return
An NIBP Test screen is provided to facilitate troubleshooting problems and
perform verification testing for the NIBP subsystem. Typically, when these tests
are performed, the pneumatic system is connected to an external pressure4-8
Section 4: Power-up Defaults Menu and Diagnostic Mode
reading device and a closed reference volume. The NIBP Test screen provides a
real-time numeric display of the pressure in the pneumatic system, means for
controlling the pump and valve, and a display indicating whether the valve is
open or closed.
The NIBP Test screen elements are described below.
•
Pressure Display: The real-time value of the system pneumatic pressure is
displayed in mmHg. The value is updated at the rate of approximately two
times per second.
•
Valve Display: A display indicates whether the valve is open or closed.
•
Activate pump: While the NIBP button is pressed, the pump will run. If
system pressure reaches the hardware over-pressure protection point (280 to
330 mmHg), the safety valve will open and the pump will be disabled, until
the pressure falls below the safety threshold.
•
Deflate: For as long as the Alarm Silence button is pressed, the valve will
open and bleed off pressure at the rate of 3 ±1.5 mmHg/sec. It is useful to
control the bleed rate to 3 mmHg/sec to facilitate certain AAMI SP10 tests.
Any time the bleed rate falls below 3 mmHg/sec, the valve will open and
remain at maximum as long as the button is pressed.
•
Open Valve: While the Volume button is pressed, the valve opens and
remains at maximum as long as the button is pressed.
•
Offset Adjust: A momentary press of the Contrast button will invoke the
“zero calibration” routine that is performed immediately prior to each blood
pressure measurement. This routine looks at the pressure in the system, and
if the pressure is non-zero, an offset is applied which causes the system
pressure to be displayed as “zero”.
When in the NIBP Test screen, the “Return” item is always highlighted; a press
of the knob will return the user to the Diagnostic Menu. Rotating the knob while
in the NIBP Test screen will have no effect.
4-9
SECTION 5: TROUBLESHOOTING
5.1 Introduction
5.2 How to Use this Section
5.3 Who Should Perform Repairs
5.4 Replacement Level Supported
5.5 Obtaining Replacement Parts
5.6 Troubleshooting Guide
5.7 Troubleshooting the Oximetry Function
5.8 P-3900 Troubleshooting Guide
5.1 INTRODUCTION
This section explains how to troubleshoot the NPB-3900 if problems arise.
Tables are supplied that list possible monitor difficulties, along with probable
causes, and recommended actions to correct the difficulty.
5.2 HOW TO USE THIS SECTION
Use this section in conjunction with Section 3, Performance Verification, and
Section 7, Spare Parts. To remove and replace a part you suspect is defective,
follow the instructions in Section 6, Disassembly Guide. The circuit analysis
section in the Technical Supplement offers information on how the monitor
functions.
5.3 WHO SHOULD PERFORM REPAIRS
Only qualified service personnel should open the monitor housing, remove and
replace components, or make adjustments. If your medical facility does not have
qualified service personnel, contact Nellcor Puritan Bennett Technical Services
or your local Nellcor Puritan Bennett representative.
5.4 REPLACEMENT LEVEL SUPPORTED
The replacement level supported for this product is to the printed circuit board
(PCB) and major subassembly or component level. Once you isolate a suspected
PCB, follow the procedures in Section 6, Disassembly Guide, to replace the PCB
with a known good PCB. Check to see if the trouble symptom disappears and
that the monitor passes all performance tests. If the trouble symptom persists,
swap back the replacement PCB with the suspected malfunctioning PCB (the
original PCB that was installed in the monitor before you started
troubleshooting) and continue troubleshooting as directed in this section.
5-1
Section 5: Troubleshooting
5.5 OBTAINING REPLACEMENT PARTS
Nellcor Puritan Bennett Technical Services provides technical assistance
information and replacement parts. To obtain replacement parts, contact Nellcor
Puritan Bennett or your local Nellcor Puritan Bennett representative. Refer to
parts by the part names and part numbers listed in Section 7, Spare Parts.
5.6 TROUBLESHOOTING GUIDE
Problems with the NPB-3900 are separated into the categories indicated in Table
5-1. Refer to the paragraph indicated for further troubleshooting instructions.
NOTE: Taking the recommended actions discussed in this section will correct
the majority of problems you may encounter. However, problems not
covered here can be resolved by calling Nellcor Puritan Bennett
Technical Services or your local representative.
Table 5-1: Problem Categories
Problem Area
Refer to
Paragraph
1. Power
• No power-up
• Fails power-on self-test
• Powers down without apparent cause
5.6.1
2. Error Messages
5.6.2
3. Buttons/Knob
• Monitor does not respond properly to buttons
5.6.3
4. Display/Audible Tones
• Display does not respond properly
• Tones do not sound properly
5.6.4
5. Operational Performance
• Displays appear to be operational, but monitor
shows no readings
• Suspect readings
• Printer not responding
5.6.5
All of the categories in Table 5-1 are discussed in the following paragraphs.
5-2
Section 5: Troubleshooting
5.6.1 Power
Table 5-2 lists recommended actions to address power problems.
Table 5-2: Power Problems
Condition
1. With external
power supply
connected, the
green
EXTERNAL
POWER
indicator
on the front panel
is not lit.
Recommended Action
1. Ensure that the external power supply input (PS120V or PS-240V) is plugged into an operational
AC outlet of the appropriate voltage and frequency.
2. Disconnect the power supply output cable from the
monitor. Measure the voltage across pins 1 and 4 of
output connector. If the open circuit voltage does
not measure approximately 17 ±3 V~ RMS, replace
the power supply.
3. If the battery is severely discharged or shorted, the
EXTERNAL POWER indicator will not light.
Connect the external power supply to an AC outlet
and to the monitor. Allow the battery to charge for
30 minutes. If the EXTERNAL POWER indicator
still does not light, replace the battery.
4. Inside the monitor, check the ribbon cable and
ensure that it is properly connected to the main
PCB.
5. The EXTERNAL POWER indicator is embedded in
the keypad. Ensure that the keypad is plugged into
Main PCB. If the connection is good, replace the
keypad.
6. If the problem persists, replace main PCB.
2.The NPB-3900
fails to power-up
when the
ON/STANDBY
button is pressed
... with the
monitor
connected to
external power
supply
1. Connect the appropriate external power supply (PS120V or PS-240V) to the monitor. Ensure that the
external power supply input is plugged into an
operational AC outlet of the appropriate voltage and
frequency. Ensure that the green EXTERNAL
POWER indicator is lit. If the indicator is not lit,
follow the steps described in Condition 1, above.
2. Ensure that the keypad is plugged into Main PCB. If
the connection is good, replace keypad.
3. If the problem persists, replace the main PCB.
5-3
Section 5: Troubleshooting
Table 5-2: Power Problems - (Continued)
Condition
Recommended Action
3. The NPB-3900
fails to power-up
when the
ON/STANDBY
button is pressed
with the monitor
not connected to
external power
supply.
1. First, follow the steps described in Condition 2,
above, to ensure that the monitor will operate when
connected to an external power supply.
2. Check fuse F301 located on the Main PCB, near the
battery cable connector. Replace fuse if necessary.
3. Recharge the battery as directed in paragraph 3.3.1.
If the battery fails to hold a charge, replace the
battery.
4. If the problem persists, replace the main PCB.
4. The NPB-3900
turns on, then
shuts off and
sounds an alarm
and no error code
is displayed.
1. Press the alarm silence button to terminate the
audible alarm. Ensure that the external power supply
is connected and the green EXTERNAL POWER
indicator is lit. If the monitor operates successfully,
the battery may be discharged, or the battery fuse
may be blown.
2. Recharge the battery as directed in paragraph 3.3.1.
If the battery fails to hold a charge, replace the
battery.
3. Check fuse F301 located on the Main PCB, near the
battery cable connector. Replace the fuse if
necessary.
4. If problem persists, replace the main PCB.
5.6.2 Error Codes
When the NPB-3900 detects an error condition, the monitor shows an error code
on the display screen. If such an error occurs during monitoring operation, an
audible alarm tone will sound, as well. Press the ALARM SILENCE button to
terminate the audible alarm tone.
When an error code appears on the display, a number in hexadecimal
representation indicates the nature of the error. Additionally, Diagnostic Mode
may be used to gain access to an error code record, stored in nonvolatile
memory, of the last 10 error codes encountered by the monitor. See Section 4 for
further details on Diagnostic Mode.
Each error code corresponds to a particular problem in the monitor.
Recommended actions to take when an error code is encountered are listed in the
sections that follow.
As an aid to troubleshooting, the NPB-3900 provides the capability for
technicians to print out a copy of the error log.
5-4
Section 5: Troubleshooting
Generating an Error Log printout
1. Connect a P-3900 printer to the monitor, and its power supply to an
appropriate source. Refer to the operator’s manual.
2. Use the Setup button and displayed menu to verify that the Printer mode is
the selected option for the Communications Selection item. (It is the factoryset default value.)
3. Turn monitor power OFF.
4. Simultaneously press the contrast button and the On/Standby button to
power up the monitor. Keep the contrast button depressed until the
monitoring screen appears (after 10 seconds). The error code printout is
generated automatically.
If error codes listed on the Diagnostic Mode error code screen or on the error log
printout are in the range from 1 to 65 (hex), a hardware problem has been
detected. Refer to Table 5-3, Serviceable Hardware Codes for additional
information on these codes.
5.6.2.1 Serviceable Hardware Error Codes
In Table 5-3 are error codes that correspond to hardware problems, and the
recommended actions to take should such an error be encountered.
Table 5-3: Serviceable Hardware Error Codes
Hex
Code
1
Explanation
Improper shutdown.
Recommended Action
1. Cycle power.
2. If this error persists, return
monitor for service.
2
3
NIBP Sensor Error. The
two pressure
transducers do not
agree.
NIBP Pressure Violation
Error. The pressure on
the cuff could not be
removed by normal
means. A fault has been
detected in the NIBP
system that could not be
handled by releasing
pressure by normal
means.
1. Check for blocked hoses in the
pneumatic system.
2. Replace Main PCB.
1. Cycle power.
2. Check for blocked hoses in the
pneumatic system.
3. Replace Main PCB.
5-5
Section 5: Troubleshooting
Table 5-3: Serviceable Hardware Error Codes - (Continued)
Hex
Explanation
Recommended Action
Code
4
5
7
8
1. Check power supply.
The measured value of
the 3.3-volt power
supply is high.
1. Check power supply.
The measured value of
the 12-volt power
supply is high.
1. Check power supply.
The measured value of
the 5-volt power supply
is low.
1. Check power supply.
2. Replace Main PCB.
2. Replace Main PCB.
2. Replace Main PCB.
2. Replace Main PCB.
9
The measured value of 1. Check power supply.
the 5-volt power supply
2. Replace Main PCB.
is high.
A
The measured value of
the isolated reference
supply on the front end
is low.
1. Check power supply.
The measured value of
the isolated reference
supply on the front end
is high.
1. Check power supply.
A checksum error is
detected on the NIBP
region of Flash
Memory.
Cycle power. If error persists, replace
Main PCB.
B
D
5-6
The measured value of
the 3.3-volt power
supply is low.
2. Replace Main PCB.
2. Replace Main PCB.
Section 5: Troubleshooting
Table 5-3: Serviceable Hardware Error Codes - (Continued)
Hex
Explanation
Recommended Action
Code
E
A checksum error is
detected on the powerup settings region of
Flash memory.
1. Turn Power Off
2. Turn power back on while
pressing both the Contrast and
Volume buttons. See Section 4.3.
3. All user selections must be
restored.
4. If error persists, replace Main
PCB.
64
The SpO2 module is
sending an error
messages to the host
CPU.
Cycle power. If problem persists,
replace Main PCB.
65
The SpO2 module is
not communicating
with the host CPU.
Cycle power. See Section 5.7.
If problem persists, replace main
PCB.
5.6.2.2 Other Error Codes
If an error code occurs that is not listed in Section 5.6.2.1, take the following
actions:
1. Turn the monitor off, then on again.
2. If the error code still appears, take the monitor out of service and contact
Nellcor Puritan Bennett Technical Services or your local Nellcor Puritan
Bennett representative for advice on remedial action.
3. If the monitor powers up and the error code does not recur, enter the
Diagnostic Mode and invoke the Error Code screen. Examine the record of
the last 10 error codes and determine if the same error code occurred
previously.
4. If the Error Code screen indicates that the same error has occurred
previously, take the monitor out of service and contact Nellcor Puritan
Bennett Technical Services or your local Nellcor Puritan Bennett
representative for advice on remedial action.
5. If the Error Code screen indicates no previous occurrences of this error, the
monitor may be returned to service.
5-7
Section 5: Troubleshooting
As a reference, Table 5-4 lists the general categories for other error codes. The
error code categories are shown only in hexadecimal format.
Table 5-4: Error Code Categories
Code (hex)
Explanation
500xxxx
internal user interface error
501xxxx
remote serial port error
502xxxx
date and time error
503xxxx
NIBP error
504xxxx
front end error
505xxxx
alarm error
506xxxx
audio error
507xxxx
recorder error
508xxxx
trend error
509xxxx
flash memory data error
50axxxx
SpO2 error
50bxxxx
ECG error
50cxxxx
power-down task error
50dxxxx
on-board diagnostic error
50exxxx
power monitor error
50fxxxx
temperature measurement error
510xxxx
internal user interface error
511xxxx
error handling error
513xxxx
serial driver error
514xxxx
system software errors
5.6.3 Buttons/Knobs
Table 5-5 lists recommended actions to address problems with the knob and
front-panel buttons.
5-8
Section 5: Troubleshooting
Table 5-5: Buttons/Knob Problems
Condition
Recommended Action
1. The NPB-3900 fails to
power-up when the
ON/STANDBY button is
pressed.
Take steps as noted in section 5.6.1.
2. The NPB-3900 powers-up,
but some/one of the other
buttons does not respond.
1. Ensure that the keypad is plugged into
the Main PCB. If the connection is
good, change the keypad.
2. If the problem persists, change the Main
PCB.
1. Ensure that the encoder cable is plugged
3. When the knob is rotated,
into the Main PCB. If the connection is
no highlight appears on the
good, change the encoder.
display screen, and/or the
monitor does not respond to
2. If the problem persists, replace the Main
knob presses.
PCB.
5.6.4 Display/Audible Tones
Table 5-6 lists recommended actions to address problems with the display and
audible tones.
Table 5-6: Display/Audible Tones Problems
Condition
Recommended Action
1. Adjust the LCD screen contrast by pressing
1. System powers-up
the contrast button momentarily, then turning
and…
the knob four revolutions in each direction.
• LCD screen is
Turning the knob clockwise should brighten
totally black or white.
the screen; turning the knob counterOr,
clockwise should darken the screen.
• LCD screen is
illuminated, but no
2. Ensure that the backlight cable is connected
data is visible.
to the main PCB.
Or,
• LCD screen has
3. Ensure that the LCD connector is properly
data, but is not
connected to the main PCB.
illuminated.
4. If problem persists, replace main PCB.
5. If problem persists, replace LCD assembly.
5-9
Section 5: Troubleshooting
Table 5-6: Display/Audible Tones Problems - Continued
Condition
Recommended Action
2. NPB-3900 responds
1. Ensure that the speaker cable is connected to
to button press, but
the main PCB.
key press tone fails to
2. If the problem persists, replace the speaker
sound.
assembly.
3.
3. Audible alarm does
not sound.
If the problem persists, replace the Main
PCB.
1. Verify alarm volume setting in the
Alarm/Limits menu, and test operation of the
alarm tone by pressing the volume button
while the alarm volume setting is displayed.
2. Ensure that the speaker cable is connected to
the Main PCB.
3. If the problem persists, replace the speaker
assembly.
4. If the problem persists, replace the Main
PCB.
5.6.5 Operational Performance
Table 5-7 lists recommended actions to address problems related to operational
performance.
Table 5-7: Operational Performance Problems
Condition
Recommended Action
1. The monitor appears to
be operational, but the
physiological values are
suspect or nonexistent.
1. Replace each patient cable (or hose) with a
known-good cable.
2. Ensure that the Patient Connector PCB is
properly connected to the main PCB.
Ensure that the hoses in the pneumatic
system are properly connected, and that the
NIBP pump motor is connected to the Rear
Connector PCB.
3. If the problem persists, replace the Patient
Connector PCB.
4. If the problem persists, replace Main PCB.
5-10
Section 5: Troubleshooting
5.7 TROUBLESHOOTING THE OXIMETRY FUNCTION
5.7.1 Introduction
The oximetry functional hardware is embedded on the NBP-3900 main printed
circuit board. (Note that “oximetry” and “SpO2” are used interchangeably in this
manual.) This section assumes that the NBP-3900 has been thoroughly checked
and that all indications point to an oximetry malfunction.
5.7.2 Fault Evaluation
Table 5-8 provides fault indications and possible solutions.
Table 5-8: Fault Evaluation
Indication
Action
NPB-3900 gives error code
64 or 65, indicating
communications problem
w/ SpO2 module.
Check 5-volt digital power supply.
NPB-3900 gives lowpriority alarm, “SpO2
Cable/Sensor Disconnect”
Sensor may be disconnected or damaged.
NPB-3900 gives status
message “SpO2 Pulse
Search”
The sensor may be improperly applied to
the patient or may be damaged. Try
another sensor. Try an SRC-2 pulse
oximeter tester to check oximetry
functionality.
Check processor clock Y1.
Check TXD buffer U5.
Patient Connector PCB may be defective.
Cover the sensor to eliminate the
possibility of ambient light interference.
The patient’s perfusion may be too poor
for the instrument to detect an acceptable
pulse. Try using C-Lock ECG
synchronization, if available.
Check + and –5 volt analog power
supplies.
Check for proper LED drive function.
Check the signal path from the
photodetector input to the A:D converter.
Waveform output incorrect
Sensor or interconnecting cables may be
damaged.
Noise may be present.
5-11
Section 5: Troubleshooting
5.7.3 Waveforms
Figures 5-1 through 5-5 are typical waveforms as measured at various test points
(labeled TP) on the oximetry module. These waveforms are valuable in tracing
signals and locating faults. The user must use a Nellcor Puritan Bennett SRC-2
pulse oximeter tester. Contact Nellcor Puritan Bennett’s Technical Services
Department or your local Nellcor Puritan Bennett representative if you have
difficulty replicating these waveform examples.
5.7.3.1 Preamplifier and PGA Outputs Waveform
5.7.3.1.1 SRC-2 Settings
Rate:
Light:
Modulation:
RCAL/MODE:
112
High2
LOW
RCAL 63/LOCAL
Figure 5-1: Preamplifier and PGA Outputs
5.7.3.1.2 Trace Descriptions
CHNL 2 :
CHNL 1 :
CHNL 3 :
5-12
TP3 Primary Input Preamplifier
TP4 Secondary Input Preamplifier
TP9 PGA output
Section 5: Troubleshooting
5.7.3.2 Filter Outputs and ADC Input Waveform
5.7.3.2.1 SRC-2 Settings
Rate:
Light:
Modulation:
RCAL/MODE:
112
High2
HIGH
RCAL 63/LOCAL
Figure 5-2: Filter Outputs and ADC Input
5.7.3.2.2 Trace Descriptions
CHNL 3 :
CHNL 1 :
CHNL 2 :
TP5 ADC Input
TP6 Red Filter Output
TP2 IR Filter Output
5-13
Section 5: Troubleshooting
5.7.3.3 SpO2 Module with an SRC-2 Waveform
5.7.3.3.1 SRC-2 Settings
Rate:
Light:
Modulation:
RCAL/MODE:
112
High2
HIGH
RCAL 63/LOCAL
Figure 5-3: SpO2 Module with an SRC-2
5.7.3.3.2 Trace Descriptions
CHNL 2 :
CHNL 1 :
5-14
TP6 Red Filter Output
TP2 IR Filter Output
Section 5: Troubleshooting
5.7.3.4 SpO2 Module with an SCR-2 LED Drive Current Test at TP7 Waveform
5.7.3.4.1 SRC-2 Settings
Rate:
Light:
Modulation:
RCAL/MODE:
112
High2
HIGH
RCAL 63/LOCAL
Figure 5-4: SpO2 Module with SRC-2 Drive Current Test at TP7
5-15
Section 5: Troubleshooting
5.7.3.5 SpO2 Module with SCR-2 Waveform
5.7.3.5.1 SCR-2 Settings
Rate:
Light:
Modulation:
RCAL/MODE:
112
High2
HIGH
RCAL 63/LOCAL
Figure 5-5: SpO2 Module with SRC-2
5.7.3.5.2 Trace Description
Serial Port TXD Signal, U4 Pin 25
5-16
Section 5: Troubleshooting
5.8 P-3900 TROUBLESHOOTING GUIDE
Table 5-9 lists recommended actions to address printer problems.
Table 5-9: P-3900 Troubleshooting Guide
Condition
Recommended Action
1. With external
power supply
connected, the
green
EXTERNAL
POWER
indicator on the
front panel is not
lit.
1. Ensure that the external power supply input (PS120V or PS-240V) is plugged into an operational
AC outlet of the appropriate voltage and frequency.
2. Disconnect the power supply output cable from the
printer. Measure the voltage across pins 1 and 4 of
output connector. If the open circuit voltage does
not measure approximately 17 ±3 V~ RMS, replace
the power supply.
3. If the battery is severely discharged, the
EXTERNAL POWER indicator may not light.
Connect the external power supply to an AC outlet
and to the printer. Allow the battery to charge for 30
minutes.
4. Open the printer enclosure and ensure that all
connectors are properly seated.
5. If the problem persists, replace the battery.
6. If the problem persists, replace the Printer PCB.
7. The EXTERNAL POWER indicator is embedded in
the Front Panel. If the problem persists, replace the
Front Panel.
5-17
Section 5: Troubleshooting
Table 5-9: P-3900 Troubleshooting Guide - (Continued)
Condition
2. No printout
occurs when
control buttons
are pressed on
P-3900 front
panel.
Recommended Action
1. Open the printer paper door and verify that the
printer is properly loaded with paper.
2. Ensure that the green LINKED indicator is lit. If not,
first determine that the serial cable is properly
connected between printer and NPB-3900 monitor.
Next, on the NPB-3900 monitor, check the “Set-up
Menu” and verify that “Communications Selection”
is set to “Printer”. If the indicator is still not lit,
replace the serial cable with a known-good cable.
3. Connect a known-good external power supply to an
AC outlet and to the printer. If both the green front
panel indicators are lit (EXTERNAL POWER and
LINKED), then the printer should operate. If the
EXTERNAL POWER indicator still fails to light,
follow the steps outlined in Condition 1.
4. Open the printer enclosure and ensure that all
connectors are properly seated.
5. If the problem persists, replace the Printer PCB.
6. If the problem persists, replace the printer
mechanism.
3. Printer paper will
advance, but
paper remains
blank when
printing should
be present.
1. Open the printer door and verify that paper is
oriented correctly. The PAPER icon adjacent to the
door release button illustrates proper orientation of
the paper roll. (The paper is thermally sensitive on
one side only; if the roll is installed backwards,
printing will not occur.)
2. If the problem persists, replace the printer
mechanism.
5-18
SECTION 6: DISASSEMBLY GUIDE
6.1 Introduction
6.2 How to Use this Section
6.3 Disassembly Flow Charts
6.4 Closed Case Disassembly
6.5 Front Case Disassembly
6.6 Rear Case Disassembly
6.7 Main PCB Disassembly
6.1 INTRODUCTION
WARNING: Performance Verification. Do not place the NPB-3900 into
operation after repair or maintenance has been performed, until all
Performance Tests and Safety Tests listed in Section 3 of this service
manual have been performed. Failure to perform all tests could result in
erroneous monitor readings.
The NPB-3900 can be disassembled down to all major component parts,
including:
•
PCBs
•
battery
•
cables
•
function buttons
•
chassis enclosures
The following tools are required:
•
medium, Phillips-head screwdriver
•
needle-nose pliers
•
9/16-inch socket (for knob encoder)
3/16 inch socket (for rear-panel RS-232 connector).
WARNING: Before attempting to open or disassemble the NPB-3900,
disconnect the power supply from the NPB-3900.
WARNING: High voltage is generated by the LCD backlight driver.
Exercise caution when operating monitor with covers open.
Caution: Observe ESD (electrostatic discharge) precautions when working
within the unit.
6-1
Section 6: Disassembly Guide
Caution: If internal battery cable has been disconnected, pay particular
attention to polarity of the cable before reattaching. If battery cable
polarity is reversed, it is likely that circuit damage will occur.
NOTE: Some spare parts have a business reply card attached. When you receive
these spare parts, please fill out and return the card.
6.2 HOW TO USE THIS SECTION
The step-by-step procedures that are used to access replaceable parts of the
NPB-3900 are illustrated in the Disassembly Flow Charts in paragraphs 6.3,
Figures 6-1, 6-2, 6-3 and 6-4. As indicated in the flow charts, the monitor
consists of two main assemblies, the Front Case Assembly, and Rear Case
Assembly. The Main PCB assembly is separable from the front case assembly.
The circles on the flow charts contain reference designators that point to specific
steps in the Disassembly Procedures. The Disassembly Procedures, paragraphs
6.4, 6.5, and 6.6 contain detailed disassembly instructions, accompanied by
illustrations.
The rectangular boxes on the flow charts represent the various spare components
or subassemblies. The digits appearing in these boxes are their respective part
numbers. Section 7, Spare Parts, contains a complete listing of the available
spare parts.
The Disassembly Flow Charts are organized so that minimum disassembly is
required to remove and replace defective items.
Further important disassembly information may be found in the diagrams in the
Appendix.
6.3 DISASSEMBLY FLOW CHARTS
The charts have been developed for use with all models of the NPB-3900 family.
Therefore, some disassembly procedures will not be applicable to model
configurations of less than the full complement of functions. In most cases, the
relevant subassemblies will not have been installed, and it will be apparent that
the pertinent procedures will not apply. However, when a temperature-measuring
function is involved, a different hardware configuration of the rear-case
assembly is shown in the flow chart.
The charts have been developed to provide service personnel with the most
direct route to a replaceable item after a troubleshooting analysis has led to a
probable cause, traced to hardware sources.
6-2
Section 6: Disassembly Guide
NPB-3900
B1
N
Temp
Model
?
A1
A3
Battery
Cover
048935
A2
A4
Battery
048987
Battery
Pads
048937
SpO2
Hood
048942
Y
Battery
Cover(Temp)
048936
Temp
Housing
048939
Temp
Grommet
048938
Probe
Switch
048992
B2
Rear Cover
Gasket
048991
Rear Case
Assembly
Fig. 6-3
B3
Battery
Cable
048940
Front Case
Assembly
Fig. 6-2
Main PCB
Assembly
Fig. 6-4
Figure 6-1: Top Level Disassembly Flow Chart
6-3
Section 6: Disassembly Guide
Front Case
Assembly
C3
C1
Spring
Retainer
048990
Speaker
Display
Shield
048944
C2
LCD
Display
048943
Display
Window
048945
Front
Cover
048947
048948
C4
Encoder
291186
Knob
044727
C5
Keypad
048946
Figure 6-2: Front Case Disassembly Flow Chart
6-4
Section 6: Disassembly Guide
Rear Case
Assembly
D2
D1
Rear Conn.
PCB
048956
D3
Pump
Clamp
048989
NIBP
Pump
048949
Handle
048941
Foot
Cushion
048950
Rear
Cover
048951
Figure 6-3: Rear Case Disassembly Flow Chart
6-5
Section 6: Disassembly Guide
Main PCB
Assembly
E2
E1
Main
PCB
048952…54
Fuse
F301
048970
NIBP
Pneumatics
048957
E3
Patient
Conn. PCB
048962…65
Connector
Panel
048966…69
Figure 6-4: Main Board Disassembly Flow Chart
6-6
Section 6: Disassembly Guide
6.4 CLOSED CASE DISASSEMBLY
The paragraphs in this section describe and photographically illustrate
procedures for disassembling the NPB-3900 to enable removal and replacement
of suspected defective assemblies/components.
The sequence supports the guides in the previous paragraphs of this section.
The illustrations may also contain juxtaposed photographs of the relevant spares.
See Figure 6-1. If there is no apparent reason to replace the battery, begin with
procedure B1. If the battery needs replacement, and there is no temperature
module (Models 3910 and 3930), begin with procedure A1.
6-7
Section 6: Disassembly Guide
Step A1
Procedure
To remove the Battery from Models 3910 and 3930, when a Temperature
module is not installed:
Use a Phillips head screwdriver to remove the two screws fastening the battery
cover to the rear case.
Remove the battery cover.
Illustration
Battery
Pad
6-8
Section 6: Disassembly Guide
Step A2
Procedure
Disconnect the spade terminal connectors from the battery terminals.
Caution: Pay particular attention to polarity of the battery cable before
reattaching. If battery cable polarity is reversed, it is likely that circuit
damage will occur.
Remove battery.
As required, remove the battery cushions on the inside of the battery
compartment and battery cover.
Illustration
Foot
Cushions
Battery
Cover
Step A3
Procedure
To remove the battery from Models 3920 and 3940, when a temperature
module is installed:
Illustration
Rear View
Models
3920, 3940
Temp
Module
6-9
Section 6: Disassembly Guide
Step A3
Procedure
Use a Phillips head screwdriver to remove the two screws fastening the
temperature module housing to the rear case assembly.
Illustration
Step A3
Procedure
Remove the temperature module housing and the battery cover.
Illustration
6-10
Section 6: Disassembly Guide
Procedure
The probe sensor contact switch is mounted on the outer side of the battery
cover.
As required, disconnect the leads from the probe switch to the rear panel
connector. Remove the switch.
Illustration
Temperature
Probe
Grommet
Probe
Sensor
Switch
Spare Probe
Sensor Switch
Step A4
Procedure
Disconnect the spade terminal connectors from the battery terminals.
Caution: Pay particular attention to polarity of the battery cable before
reattaching. If battery cable polarity is reversed, it is likely that circuit
damage will occur.
Remove battery.
As required, remove the battery cushions on the inside of the battery
compartment and battery cover.
Illustration
Battery Cover
Plate
Foot
Cushions
6-11
Section 6: Disassembly Guide
Step B1
Procedure
To separate the Front and Rear Case Assemblies:
Remove the SpO2 connector hood by squeezing the sides to release the detents
holding the hood in place.
Illustration
SpO2
Connector
Hood
Step B2
Procedure
Use a Phillips head screwdriver to remove the four screws fastening the
front to rear case assemblies.
Separate the main front and rear case assemblies.
If the rear cover gasket seal is to be replaced, remove it.
Illustration
Rear Case
Assembly
Front Case
Assembly
6-12
Section 6: Disassembly Guide
Step B2
Procedure
Disconnect the ribbon cable and its connector from the PCB assembly.
Illustration
Ribbon Cable
and Connector
Procedure
To remove the Main PCB Assembly from the Front Case Assembly:
Use a Phillips head screwdriver to remove screws holding the Main PCB
Assembly in place in the Front Cover Assembly.
For reassembly, note the two guides in the cover and the corresponding two
notches in the PCB.
Illustration
6-13
Section 6: Disassembly Guide
Step B3
Procedure
Disconnect the remaining connectors at the Main PCB.
Disconnect the battery cable spade terminals from the main PCB assembly. If
the battery cable is to be removed, the cable must also be disconnected from the
battery, as described in Procedure A.
Caution: Pay particular attention to polarity of the battery cable before
reattaching. If battery cable polarity is reversed, it is likely that circuit
damage will occur.
Illustration
Luer Connector
to NIBP pump
tubing
Battery
Cable
6-14
Section 6: Disassembly Guide
Step B3
Procedure
Unscrew the NIBP Luer connector. See Illustration in Step B2.
There are now three separate items:
Front Cover Assembly
Rear Case Assembly
Main PCBPCB Assembly
Illustration
Main PCB
Assembly
Rear Case
Assembly
Front Case
Assembly
6-15
Section 6: Disassembly Guide
6.5 FRONT CASE DISASSEMBLY
See Figure 6-2.
Step C1
Procedure
To remove the Display:
Use a Phillips head screwdriver to unfasten the four corner screws and remove
the display shield.
The four screws also hold the LCD assembly in place.
Illustration
Backlight
Connector
Keypad Cable
and Connector
Speaker
Connector
Knob Encoder
Assembly
6-16
Section 6: Disassembly Guide
Step C2
Procedure
Remove the LCD Assembly, providing access to the Display Window.
Remove Display Window by carefully prying up one corner, then peeling back.
Illustration
Display
Window
Shield
Speaker
LCD Assembly
Spare
Display
Window
6-17
Section 6: Disassembly Guide
Step C3
Procedure
To remove the speaker:
Remove the retaining spring clip.
Remove the speaker.
Illustration
Spare Speaker,
Leads Attached
Step C4
Procedure
To remove the NPB Knob and Encoder:
From the front, remove the knob by grasping the sides of the knob firmly and
pulling straight back from the monitor. (The knob is friction fit on the stem of
the encoder assembly.)
Use a 9/16” hex socket to unscrew the fastening nut on the outside of the front
case. The encoder may now be pulled away from the front case.
Illustration
Nut
Spare Knob
6-18
Encoder
Assembly
Section 6: Disassembly Guide
Step C5
Procedure
To remove the Keypad
The keypad is attached with an adhesive to the front panel. From the front side
of the panel, carefully pry up one corner of the keypad from the cover, and peel
away from the cover.
Carefully, thread the cable out through the slot in the cover.
Illustration
Spare Knob
Keypad,
Integral Cable
and Connector
6-19
Section 6: Disassembly Guide
6.6 REAR CASE DISASSEMBLY
See Figure 6-3.
Step D1
Procedure
To remove a Rear Connector PCB:
Use a Phillips head screwdriver to remove the two screws holding the Rear
Connector PCB to the rear cover.
From outside the rear cover, use 3/16 socket driver to remove the two standoff
fasteners of the RS-232 connector.
From inside the rear cover, remove the Rear Connector PCB Assembly.
Illustration
NIBP Pump,
Hose and
Lead Attached
Rear Connector
Board Assembly
6-20
Section 6: Disassembly Guide
Step D2
Procedure
To remove NIBP Pump:
Use Phillips head screwdriver to unfasten screw holding clamp to rear cover.
Disconnect power lead from Rear Connector PCB.
Remove Clamp and Pump.
Illustration
NIBP
Pump
Pump
Power Lead
Step D3
Procedure
To remove Handle and Foot Cushions:
Each end of the handle is friction-fit onto a cross-shaped boss. Use flat-bladed
screwdriver to carefully pry one end of the handle.
When the end of the handle has begun to loosen from the boss, use the same
technique to begin to pry up the other end.
Alternate prying action between each end of the handle until the handle is free of
the rear case.
Foot cushions are attached with an adhesive to the bottom surface of the rear
cover, and can be removed by lifting one end of the foot and peeling off.
6-21
Section 6: Disassembly Guide
6.7 MAIN PCB DISASSEMBLY
See Figure 6-4.
Step E1
Procedure
To remove NIBP Pneumatic Assembly from the Main PCB Assembly:
Pull tubing from barbed fitting on rear of NIBP panel connector.
Pull tubing from fittings on the pressure sensors and valve.
Illustration
NIBP
Pneumatic
Assembly
Group
Pressure
Sensor
Step E2
Procedure
To separate the Patient Connector PCB Assembly from the Main PCB
Assembly:
Use wire cutters to remove the two Tinnerman fasteners securing the Patient
Connector PCB Assy to the underside of the Main PCB.
Disconnect the Patient Connector PCB Assy by pulling it straight up from the
Main PCB.
The battery fuse F301, located near the battery cable connector on the Main
PCB, may be replaced if necessary.
Illustration
Main PCB
Assembly
6-22
Patient
Connector
PCB
Assembly
Foot of Molded
Connector Panel
after removal of
Tinnerman nut
Section 6: Disassembly Guide
Step E3
Procedure
To separate the Patient Connector PCB from the Connector Panel:
Use Phillips head screwdriver to remove four screws fastening the two
assemblies together. NOTE: Two of the screws are accessible on the face of the
Connector PCB; two are accessible through access holes in the PCB.
Illustration
Connector
Panel
Patient
Connector
PCB
6-23
SECTION 7: SPARE PARTS
7.1 Introduction
7.2 Top Level Assembly
7.3 Front Case Assembly
7.4 Rear Case Assembly
7.5 Main PCB Assembly
7.6 P-3900 Printer
7.1 INTRODUCTION
Spare parts, along with part numbers, are listed in the tables that follow. “Item
No.” corresponds to the callout numbers in Figures A 29 through A-31 that are
found in the Appendix. The “Step Ref.” corresponds to the disassembly
procedures described in Section 6.
7.2 TOP LEVEL ASSEMBLY
Table 7-1: Top Level Assembly
Item
No.
Description
NPB Part No.
Step
Ref.
1
Battery Cover (Models 3910, 3930)
048935
A1
2
Battery Cover (Models 3920, 3940)
048936
A3
3
Battery
048987
A2/A4
4
Battery Pads
048937
A2/A4
5
Temperature Module Housing
048939
A3
6
Temperature Probe Sensor Switch
048992
A3
7
Temperature Probe Grommet
048938
A3
8
SpO2 Connector Hood
048942
B1
9
Rear Cover Gasket
048991
B2
10
Ribbon Cable and Connector
048934
B2
44
Battery Cable
048940
B3
7-1
Section 7: Spare Parts
7.3 FRONT CASE ASSEMBLY
Table 7-2: Front Case Assembly
Item
No.
Description
NPB
Part No.
Step
Ref.
11
Front Cover Assembly (with Keypad and
Display Window)
048947
C2
12
Display Shield
048944
C1
13
LCD Assembly
048943
C2
14
Display Window (with Gasket)
048945
C2
15
Speaker
048948
C3
16
Spring Retainer Clip and Pad
048990
C3
17
Knob
044727
C4
18
Encoder
291186
C4
19
Keypad
048946
C5
7.4 REAR CASE ASSEMBLY
Table 7-3: Rear Case Assembly
Item
No.
7-2
Description
NPB
Part No.
Step
Ref.
20
Rear Connector PCB (with Ribbon
Cable)
048956
D1
21
Pump Clamp
048989
D2
22
Pump Pad
048988
D2
23
NIBP Pump, Fitting, and Tubing
048949
D3
24
Rear Cover (Assembly) with Feet
Cushions and Gasket
048951
D3
25
Foot Cushion
048950
D3
45
Handle
048941
D3
Section 7: Spare Parts
7.5 MAIN PCB ASSEMBLY
Table 7-4: Main Board Assembly
Item
No.
Description
NPB Part No.
Step
Ref.
26
Main PCB (Model 3910)
048952
E2
27
Main PCB (Model 3920/3940)
048953
E2
28
Main PCB (Model 3930)
048954
E2
30
NIBP Pneumatic (Assembly) with
Tubing, and Fittings
048957
E1
31
Patient Connector PCB (Model 3910)
048962
E3
32
Patient Connector PCB (Model 3920
048963
E3
33
Patient Connector PCB (Model 3930)
048964
E3
34
Patient Connector PCB (Model 3940)
048965
E3
35
Fuse F301, 4A
048970
E2
40
Connector Panel (Model 3910)
048966
E3
41
Connector Panel (Model 3920)
048967
E3
42
Connector Panel (Model 3930)
048968
E3
43
Connector Panel (Model 3940)
048969
E3
Note: The Main PCB for all of the NPB-3900 models has jumpers which must
be set correctly so that the User Interface software is configured to
support the measuring parameters of each particular model . There are
two jumpers, marked “JP101” and “JP102”, located immediately below
the NIBP valve. Ensure that the jumpers are installed as noted in the table
which follows:
Table 7-5: Main PCB Jumper Configuration
Model Number
JP101
JP102
NPB-3910
Installed
Installed
NPB-3920
Installed
Empty
NPB-3930
Empty
Installed
NPB-3940
Empty
Empty
7-3
Section 7: Spare Parts
7.6 P-3900 PRINTER
Spare parts, along with part numbers, are listed in the table that follows. “Item
No.” corresponds to the callout numbers in Figure A-32 found in the Appendix.
Table 7-5: P-3900 Printer
Item
No.
7-4
Description
NPB
Part No.
1
Battery, 12 V Rechargeable
048972
2
PCB Assembly
048971
3
Chassis
048973
4
Cover
048974
5
Cable, Battery to PCB
048976
6
Cable, Power Conn. to PCB
048977
7
Panel, Front
048978
8
AR-42 Printer Mechanism (complete)
048979
9
Door Assembly
048980
10
Switch, Membrane
048983
11
Rubber Foot
891435
12
Cable, RS-232
902202
SECTION 8: PACKING FOR SHIPMENT
8.1 General Instructions
8.2 Repacking in Original Carton
8.3 Repacking in a Different Carton
8.1 GENERAL INSTRUCTIONS
Pack the monitor carefully. Failure to follow the instructions in this section may
result in loss or damage to the monitor. If the original shipping carton is not
available, use another suitable carton. North American customers may call
Nellcor Puritan Bennett Technical Services to obtain a shipping carton.
Prior to shipping the monitor, contact Nellcor Puritan Bennett’s Technical
Services Department or your local Nellcor Puritan Bennett representative for a
returned goods authorization (RGA) number. Mark the shipping carton and any
shipping documents with the RGA number. European customers not using RGA
numbers, should return the product with a detailed, written description of the
problem.
Return the monitor by any shipping method that provides proof of delivery.
To pack the monitor for return, disconnect all cables. It is not necessary to return
sensors, patient cables, NIBP hose and cuff, temperature probe, or external
power supply.
8.2 REPACKING IN ORIGINAL CARTON
If available, use the original carton and packing materials. Pack the monitor as
follows:
1.
Place the monitor in original packaging.
2.
Place in shipping carton and seal carton with packaging tape.
3.
Label carton with shipping address, return address and RGA number, if
applicable.
8.3 REPACKING IN A DIFFERENT CARTON
If the original carton is not available, use the following procedure to pack the
monitor:
1. Place the monitor in a plastic bag.
2. Locate a corrugated cardboard shipping carton with at least 200 pounds per
square inch (psi) bursting strength.
3. Fill the bottom of the carton with at least 2 inches of packing material.
4. Place the bagged unit on the layer of packing material and fill the box
completely with packing material.
5. Seal the carton with packing tape.
8-1
Section 8: Packing for Shipping
6. Label the carton with the shipping address, return address, and RGA
number, if applicable.
8-2
SECTION 9: SPECIFICATIONS
9.1 General
9.2 Electrical
9.3 Physical Characteristics
9.4 Environmental
9.5 Measuring Parameters
9.6 Trends
9.7 P-3900 Printer (Optional)
9.1 GENERAL
Size:
Width:
10.5” (26.7 cm)
Height:
6.2” (15.7 cm)
Depth:
3.7” (9.4 cm)
4.6” (11.7 cm) with temperature module
Weight:
4.9 lb (2.2 kg) excluding accessories,
options, cables
Display:
Screen Type:
Liquid Crystal Display (LCD),
Monochrome, Cold Cathode Fluorescent
Backlit
Screen Size:
103 mm x 79 mm
Resolution:
320 x 240 pixels
9.2 SAFETY STANDARDS
IEC 601-1, UL 2601-1, CAN/CSA C22.2 601.1
Protection Class:
Class II, internally powered equipment, per
IEC 601-1, clause 2.2.5
Degree of Protection:
Type CF: per IEC 601-1, clause 2.2.26
Mode of Operation:
Continuous
9-1
Section 9: Specifications
9.3 ELECTRICAL
Power Sources
Internal Battery:
Type:
6V, 4 Ampere Hours; Sealed, lead-acid
Battery Operating Time:
4 hours, typical, for a fully charged battery,
at 25°C, one NIBP per 15 min.
External Power Supply:
PS-120V:
100 - 120VAC, 50 - 60 Hz, 0.15 A
PS-240V:
220 - 240VAC, 50 - 60 Hz, 0.8 A
9.4 ENVIRONMENTAL
Mechanical Shock:
IEC 68-2-27; 100 g; 6 msec; three axes;
18 total shocks; non-operating
Mechanical Vibration:
IEC 68-2-6; Sinusoidal; 10 - 58 Hz; 0.15 in.
displacement 58 - 150 Hz; 2 g acceleration 4
min/sweep; 20 sweeps/axes, non-operating
Thermal:
Operating Temperature:
0 to 50°C
Storage Temperature:
-20 to 60°C
Humidity:
Operating:
5 to 95% RH, non-condensing
Storage:
5 to 95% RH, non-condensing
Water Resistance:
IEC 529 Classification IPX1 (Protected
against vertically dripping water)
Altitude:
0 - 10,000 ft ( 0 - 3050 m)
Electromagnetic
Compatibility
Radiated and conducted electromagnetic
energy per CISPR 11, Class B
9.5 MEASURING PARAMETERS
9.5.1 ECG Measurement/Display
9-2
Heart Rate Range:
20 - 250 BPM
Heart Rate Accuracy:
±5 BPM
Section 9: Specifications
Bandwidth:
Normal Monitoring:
0.5 Hz to 40 Hz
Extended Low Frequency
Response:
0.05 Hz to 40 Hz (user selectable)
Leads:
3 Lead (user selectable)
Display Sweep Speeds:
12.5, 25, and 50 mm/sec
Pacemaker Detection:
Indicator on waveform display (user
selectable)
ECG Size (sensitivity):
0.5, 1, 2, 4 mV/cm
Lead Off Detection:
Detected and displayed
Input Impedance:
> 5 MΩ
CMMR (common mode
rejection ratio):
> 90 dB at 50 Hz or 60 Hz
Input Dynamic Range:
±5 mV AC, ±300 mV DC
Defibrillator Discharge
Recovery:
<5 sec per IEC 601-2-27
<8 sec per AAMI EC13-1992
Standards:
Meets the performance standards of
ANSI/AAMI EC13-1992. Instead of a 1 mV
standardizing voltage (section 3.2.2.9), a
fixed, 1 cm reference bar is always present in
the ECG display, along with the ECG size
setting expressed in mV/cm. The following
information references particular sections of
ANSI/AAMI EC13-1992.
Leads-off sensing waveform.
Section 3.1.2.1(b)
Applied currents less than 0.25 microamps.
Tall T-wave rejection.
Section 3.1.2.1(c)
T-wave of 0.6 mV amplitude will not affect
heart rate determination.
Heart rate averaging
Section 3.1.2.1(d)
Averages six of the most recent eight detected
R-R intervals excluding the longest and
shortest of the eight intervals.
Response to irregular rhythm.
Section 3.1.2.1(e)
a) Ventricular bigeminy: the NPB-3900
counts both large and small QRS complexes
to display a rate of 80 bpm.
9-3
Section 9: Specifications
b) Slow alternating ventricular bigeminy: the
NPB-3900 inconsistently counts the large Twave following the first Q-wave and the
smaller QRS complexes, Thus causing the
rate to vary between 38 and 80. With slightly
smaller T-wave, the rate was 30 bpm
consistently.
c) Rapid alternating ventricular bigeminy: the
NPB-3900 generally counts only the first
QRS complex of each pair to display a rate of
60 bpm, with infrequent counting of the
second complex, resulting in a momentary
increase to 70 bpm.
d) Bi-directional systoles: the NPB-3900
counts both the positive and negative phases
of the large complexes due to the long
interval between them. It also counts the
small complexes, for an averaged heart rate of
135 bpm, with variation between 127 and 157
bpm due to inconsistent counting.
Heart rate meter response
time.
Section 3.1.2.1(f)
Time to alarm for
tachycardia. 3.1.2.1(g)
a) Change from 80 to 120 BPM: 3 sec
b) Change from 80 to 40 BPM: 7 sec
Waveform 4(a)
Amplitude
0.5 mV
1mV
2mV
Waveform 4(b)
Amplitude
1 mV
2mV
4mV
Pacemaker pulse rejection without over/undershoot. 3.1.4.1
a.
9-4
For single (ventricular-only) pacemaker pulses alone, with 0.1 and 2.0
ms. pulse-widths and ±2 mV and ± 700 mV pulse-amplitudes, the
NBP3900 correctly displays heart rate as zero bpm (Asystole).
Section 9: Specifications
b) For single (ventricular-only) pacemaker pulses with normally paced QRST, with 0.1 and 2.0 ms. pulse-widths and ±2 mV and ± 700 mV pulseamplitudes, the NBP3900 correctly displays heart rate of the QRS-T
rhythm (60 bpm for the specified test waveform).
c) For single (ventricular-only) pacemaker pulses with ineffectively paced
QRS pattern, with 0.1 and 2.0 ms. pulse-widths and ±2 mV and ± 700 mV
pulse-amplitudes, the NBP3900 correctly displays heart rate of the
underlying QRS-T rhythm (30 bpm).
d) For atrial/ventricular pacemaker pulses alone, with 0.1 and 2.0 ms. pulsewidths and ±2 mV and ± 340 mV pulse-amplitudes, the NBP3900
correctly displays heart rate of zero bpm (Asystole).
e) For atrial/ventricular pacemaker pulses with normally paced QRS-T, with
0.1 and 2.0 ms. pulse-widths and ±2 mV and ± 700 mV pulse-amplitudes,
the NBP3900 correctly displays heart rate of the QRS-T rhythm (60 bpm),
except for the case of 2.0 ms width and -700 mV amplitude, which causes
a displayed heart rate of 120 bpm.
f) For atrial/ventricular pacemaker pulses with ineffectively paced QRS
pattern, with 0.1 and 2.0 ms. pulse-widths and ±2 mV and ± 340 mV
pulse-amplitudes, the NBP3900 correctly displays heart rate of the
underlying QRS-T rhythm (30 bpm).
Pacemaker pulse rejection with over/undershoot. 3.1.4.2
a) For single (ventricular-only) pacemaker pulses alone, with 0.1 and 2.0 ms.
pulse-widths and ±2 mV and ± 120 mV pulse-amplitudes, the NBP3900
correctly displays heart rate of zero bpm (Asystole), except for cases with
2.0ms width and ± 2mV amplitude and 25% over/undershoot (time
constant t0 is 55 ms.) which cause a displayed heart rate of 60 bpm.
b) For single (ventricular-only) pacemaker pulses with normally paced QRST, with 0.1 and 2.0 ms. pulse-widths and ±2 mV and ± 700 mV pulseamplitudes, the NBP-3900 correctly displays heart rate of the QRS-T
rhythm (60 bpm), except for the case of 2.0 ms width and +700 mV
amplitude, which causes a displayed heart rate of 120 bpm.
c) For single (ventricular-only) pacemaker pulses with ineffectively paced
QRS pattern, with 0.1 and 2.0 ms. pulse-widths and ±2 mV and ± 120 mV
pulse-amplitudes, the NBP3900 correctly displays heart rate of the
underlying QRS-T rhythm (30 bpm).
d) For atrial/ventricular pacemaker pulses alone, with 0.1 and 2.0 ms. pulsewidths and ±2 mV and ± 120 mV pulse-amplitudes, the NBP3900
correctly displays heart rate of zero bpm (Asystole), except for cases with
2.0ms width and ± 2mV amplitude and 25% over/undershoot (time
constant t0 is 55 ms.) which cause a displayed heart rate of 60 bpm.
9-5
Section 9: Specifications
e) For atrial/ventricular pacemaker pulses with normally paced QRS-T, with
0.1 and 2.0 ms. pulse-widths and ±2 mV and ± 700 mV pulse-amplitudes,
the NBP3900 correctly displays heart rate of the QRS-T rhythm (60 bpm
for the specified test waveform).
f) For atrial/ventricular pacemaker pulses with ineffectively paced QRS
pattern, with 0.1 and 2.0 ms. pulse-widths and ±2 mV and ±120 mV pulseamplitudes, the NBP3900 correctly displays heart rate of the underlying
QRS-T rhythm (30 bpm).
9.5.2 NIBP (Noninvasive Blood Pressure) Measurement/Display
Technique:
Oscillometric
Measurement Modes:
Auto:
Automatic BP measurements at intervals of 1,
3, 5, 10, 15, 30, 60, and 90 minutes
Manual:
Single measurement initiated by Start/Stop
button
STAT:
Series of consecutive measurements for 5
minutes
Cuff Pressure Display:
10 - 300 mmHg
Blood Pressure Measurement Range:
Systolic:
60 to 250 mmHg
Mean Arterial Pressure:
30 to 235 mmHg
Diastolic:
20 to 220 mmHg
Pulse Rate Range:
40 to 200 BPM
Blood Pressure
Accuracy:
Mean error and standard deviation per
ANSI/AAMI SP10, 1992
Pulse Rate Accuracy:
Greater of ±2 BPM or ±2% of pulse rate
value
Standards:
Meets performance standards of ANSI/AAMI
SP10-1992
9.5.3 Temperature Measurement/Display
9-6
Technique:
Welch-Allyn SureTemp® Thermistor Probe
Range:
84oF to 108oF (28.9oC to 42.2oC)
Accuracy:
±0.2oF, (±0.1°C)
Measurement Time:
Oral - approximately 4 seconds
Rectal - approximately 15 seconds
Section 9: Specifications
9.5.4 SpO2 Measurement/Display
Range:
Pulse Rate:
20–250 BPM
% Saturation:
0–100%
Accuracy:
Pulse Rate:
±3 BPM
SpO2:
70–100%: ±2 digits
0–69% Unspecified
Accuracies are expressed as plus or minus “X” digits (saturation percentage
points) between saturations of 70-100%. This variation equals plus or minus
one standard deviation (1SD), which encompasses 68% of the population. All
accuracy specifications are based on testing the subject monitor on healthy
adult volunteers in induced hypoxia studies across the specified range. Adult
accuracy is determined with Oxisensor II D-25 sensors. Accuracy for neonatal
readings is determined with Oxisensor II N-25 sensors. In addition, the
neonatal accuracy specification is adjusted to take into account the theoretical
effects of fetal hemoglobin in neonatal blood on oximetry measurements.
Pulse Rate (optically derived)
20–250 bpm ±3 bpm
Accuracies are expressed as plus or minus “X” bpm across the display range.
This variation equals plus or minus 1 Standard Deviation, which encompasses
68% of the population.
9.6 TRENDS
Type:
Tabular
Memory Storage:
12 hours, nonvolatile
Data interval:
20 seconds: (Stored data point is the average
over 20-second interval)
Tabular Format:
One table for all variables
Six fields per row (time and 5 vital signs)
Display interval:
Per NIBP measurement, or 15 minutes for no
NIBP, or 20 seconds during alarm condition.
9.7 P-3900 PRINTER (OPTIONAL)
Type:
Thermal
Size:
6.7” x 3.8” x 5.0” (17.0cm x 9.7cm x 12.7cm)
Weight:
3.8 lb (1.5 kg)
Paper Width
50 mm
Print Speed:
25 mm/s
9-7
Section 9: Specifications
POWER SOURCES
Internal Battery
Type:
Sealed, lead-acid, 12V, 1.2 amp/hr
Battery Operating Time:
3 hours, typical, at 25oC (fifteen 20-second
printouts per hour)
External Power Supply
9-8
PS-120V
100 - 120V, 50 - 60Hz, 0.15A
PS-240V
220 - 240V. 50 - 60 Hz, 0.8A
SECTION 10: RS-232 INTERFACE
10.1 Serial Interface Connections
10.2 Nurse Call
10.3 Exporting Trend Data
10.1 SERIAL INTERFACE CONNECTION
The 9-pin connector mounted on the rear panel provides an access port for a
serial (RS-232) interface to the P-3900 Printer, or to a suitably configured
personal computer. Alternatively, qualified service personnel can use the
connector to send a Nurse Call signal.
NOTE: The “Communications Selection” item in monitor’s “Set-up Menu”
must be set to “Printer” if the P-3900 is to be used; or, must be set to
“Trend Xfer” if trend data is to be exported to a personal computer.
(Set-up Menu is opened by selecting the screwdriver icon found along
the bottom of the display.)
Table 10-1: RS-232 Serial Interface
Connections
Pin #
Signal
Direction
1
not used
2
Rx data
<<<<
3
Tx data
>>>>
4
DTR
>>>>
5
Signal Ground
<<>>
6
DSR
<<<<
7
RTS
>>>>
8
CTS
<<<<
9
Alarm Out
>>>>
10.2 NURSE CALL
Pin 9 of the RS-232 serial interface connector provides an “Alarm Out” signal.
Any time there is an alarm condition active in the NPB-3900, pin 9 will go to
plus RS-232 level voltage (> +5 VDC), if “Nurse Call Signal” is set to ON in the
Set-up Menu. Any time there is no active alarm condition, pin 9 will be at minus
RS-232 level voltage (< -5 VDC). If in the Set-up Menu “Nurse Call Signal” is
set to OFF, pin 9 will always be at the minus RS-232 level voltage. In order to
make use of the Alarm Out signal, pin 9 should be connected to a highimpedance circuit (> 1000Ω) and protected against transient voltages.
10-1
Section 10: RS-232 Interface
10.3 EXPORTING TREND DATA
In order to download trend data from the NPB-3900, communication software,
such as PROCOMM™, should be installed in the external computer. The
transfer protocol should be set as follows:
Baud Rate:
19,200
Data Bits:
8
Start Bit:
1
Stop Bits:
1
Parity:
None
Connect the NPB-3900 to the serial port of the computer using a null modem
cable. Start the communication program on the computer and enter terminal
emulation mode. To initiate the transfer, type tr (lower case is necessary),
followed by a carriage return <cr>.
If the command is not accepted, the response to an invalid command is ??,
followed by a carriage return <cr>.
In response to a valid command, the NPB-3900 will send a comma-delimited
ASCII text file comprising the entire contents of the NPB-3900’s trend memory.
Each line is divided into five main groups, separated by a space <sp> and ending
with a carriage return <cr> and line feed <lf>. The format for each line is:
RECORD<sp>DATE<sp>TIME<sp>ALARMS<sp>VITALS<cr><lf>
The fields within each group are identified and defined as follows:
RECORD:
record number,
Format:
2 characters
no leading zero suppression
right justified
DATE:
day, month, year,
Format:
day and month: 2 characters
year: 4 characters
no leading zero suppression
right justified
10-2
Section 10: RS-232 Interface
TIME:
hours, minutes, seconds,
Format:
2 characters
no leading zero suppression
right justified
ALARMS:
heart rate alarm, SpO2 alarm, (respiration rate alarm), systolic pressure
alarm, diastolic pressure alarm, mean arterial pressure alarm,
(temperature alarm),
Each field in this group is either:
0: corresponding vital sign was not in alarm state
or,
1: corresponding vital sign was in alarm state
NOTE: In order to maintain a consistent trend data format between the
NPB-3900 and NPB-4000 patient monitors, the NPB-3900 maintains a
field for “respiration rate alarm” and “temperature alarm”, even though
the NPB-3900 does not have an alarm for respiration rate or temperature.
For the NPB-3900, the fields for “respiration rate alarm” and
“temperature alarm” will always have a value of “0”.
VITALS:
heart rate, SpO2, (respiration rate), systolic pressure, diastolic pressure,
mean arterial pressure, temperature,
Field Name
Units
Format
heart rate
1/min
4 characters; leading zeroes
suppressed; right justified
SpO2
%
4 characters; leading zeroes
suppressed; right justified
respiration rate
-
value will always be “0”; right
justified
systolic pressure
mmHg
4 characters; leading zeroes
suppressed; right justified
diastolic pressure
mmHg
4 characters; leading zeroes
suppressed; right justified
mean arterial
pressure
mmHg
4 characters; leading zeroes
suppressed; right justified
temperature
degrees C
(no degrees F)
4 characters, including decimal
point; leading zero not
suppressed; right justified
10-3
Section 10: RS-232 Interface
NOTE: In order to maintain a consistent trend data format between the
NPB-3900 and NPB-4000 patient monitors, the NPB-3900 maintains a
field for “respiration rate”, even though the NPB-3900 does not measure
respiration rate. For the NPB-3900, the field for “respiration rate” will
always have a value of “0”.
If no vital sign was measured during a 20-second trend interval, characters in the
corresponding field will be blank (<sp><sp><sp><sp>,). If the vital sign
displayed dashes during a 20-second trend interval, characters in the
corresponding field will contain dashes (----,).
Example of several lines of a trend file:
10-4
01, 04,02,1998, 08,37,22, 0,0,0,0,0,0,0,
72,
96,
0, 140,
90, 106,37.8,
01, 04,02,1998, 08,37,02, 0,1,0,0,0,0,0,
69,
82,
0,
,
,
,38.0,
02, 04,01,1998, 22,43,05, 0,0,0,0,0,0,0, 103,----,
0,
,
,
,38.2,
02, 04,01,1998, 22,42,45, 0,0,0,0,0,0,0, 103,----,
0, 127,
73,
95,38.1,
APPENDIX - TECHNICAL SUPPLEMENT
A-1 General
A-2 Block Diagram
A-3 Isolated Patient Connection Section
A-4 Temperature Measurement Circuit
A-5 ECG Inputs
A-6 On/Off Power Control
A-7 Audio Volume and Speaker Drive
A-8 Power Supplies
A-9 NIBP Section
A-10 System A/D
A-11 Buttons and Lights
A-12 SpO2
A-13 Microcontroller
A-14 Program Storage/Execution
A-15 DRAM Control
A-16 Real Time Clock
A-17 UART Operation
A-18 FPGA Glue Logic
A-1 GENERAL
This section contains descriptions of the principles of operation of the major
functional modules of the monitor, including the overall block diagram, power
supply, isolated front end, NIBP control, the SpO2 processing module, and
microcontroller.
A-2 BLOCK DIAGRAM
The Monitor (see Figure A-1) contains an isolated front-end section, powered by
an isolated power supply, and in which the signals from SpO2, temperature, and
ECG sensors are processed. The plastic tubing provides sufficient isolation for
signals from the cuff in NIBP monitoring.
A single A/D converter is used to digitize processed temperature, NIBP, and
ECG inputs; the SpO2 module produces digitized data.
A microcontroller, Intel 386, requests and receives instructions from a flash
memory. The processor has a 16-bit data bus, and uses 19 of the 24-bit address
bus. These, and eight control signals, are used to read and write to the DRAM,
flash memory, UART, and FPGA (programmable gate array). Other interface
connections are made through the I/O port signals, timer signals, and interrupt
signals.
A-1
Appendix - Technical Supplement
The FPGA provides signals for control and data to the LCD. Bias voltage and
backlight power for the LCD are provided by the power supply section. The
FPGA processes front-panel button and Nellcor Puritan Bennett knob operations.
Circuit details for these blocks are contained in this section, of the manual . This
section provides a brief theory of operation of the circuits noted in the block
diagram. Portions of the schematic diagrams are reproduced for some
paragraphs.
Temp Probe
Switch
Keypad/Knob
ISOLATED FRONT END
TEMP
Probe
PS CLK
ISO PS
Heater
XFMR
TEMP
DIG
OPTO
OSC
MSTR
CLK
RTC
LCD Display
LCD CNTL/DATA
FPGA
FRONT END CNTL
DRAM CNTL
DRAM
Bias
Voltage
Backlight
Power
SPO2
DIG
OPTO
386EX
C STEP
DRAM DATA
SPO2
Input
Connector
A/D
A/D
CNTL
DRAM ADDRESS
ECG
LIN
OPTO
FPGA DATA
ECG Input
Connector
FPGA ADDRESS
CNTL
ADDRESS BUS
FLASH ADDRESS
SPO2 SERIAL CNTL
FLASH DATA
16 Bit Bi-directional bus
Speake
r
Pump
FLASH CNTL
Pressure Sensor
#1
NIBP
Amplifiers
Pressure Sensor
#2
NIBP
Fitting
Volume Control
Audio Driver
FLASH
UART/RS232
ON/OFF
Control
Proportiona
l
Valve
Back Light Power
Supply (300 VRMS)
Failure
Alarm
+5 V
Ven
t
RS-232
Connecto
r
ON/OFF Control
and Watchdog
Alarm
+5 V Regulator
LCD Bias Regulator
6V 4AH Battery
+3.3 V Regulator
Figure A-1: NPB-3900 Block Diagram
A-3 ISOLATED PATIENT CONNECTION SECTION
A-3.1 General
The connections to the patient consist of:
ECG (three directly connected leads)
Temperature (probe)
SpO2 (DS-100A sensor, etc.)
NIBP (pneumatic cuff)
A-2
Battery Charger
Charger
Connecto
r
External
Battery
Charger
16V RMS
AC INPUT
Appendix - Technical Supplement
The NIBP section is isolated by virtue of the plastic tubing used to connect to the
patient blood pressure cuff. The ECG, Temp, and SpO 2 sections are isolated by a
floating power supply, digital optocouplers, and linear optocouplers.
A-3.2 Isolated Power Supply
The patient connection electronics are powered by an isolated power supply. A
full bridge drives transformer T201 with a 100 kHz drive. EMI reducing
components serve to limit the sharp rising and falling edges of the waveform.
Rectifiers D10 and D11 with linear regulators U5 and U6 create ±5 VDC for the
floating circuits. LC filters are used to reduce ripple. D3 and D4 provide ±5.5
VDC for U72 to improve the output swing.
A-3.3 Digital Transfers
Two digital optocouplers, U200 and U201, are used to transfer data and clock
signals to the isolated front end. Serial shift register U66 receives the serial data,
which is loaded into the register outputs when one shot U4 times out at the end
of the clock burst. The eight bits thus loaded are:
MUX A,B,C
The analog MUX channel (1 of 8) selector
LSEL 1,2
The ECG lead selector (3 valid combinations)
0.5 HZ
Low freq. ECG cutoff selector
ECGRES
ECG quick baseline reset
Parity
As required to force ODD parity
Parity is forced by the host to ODD for each digital transfer. If EVEN parity is
sensed, the analog channel will be forced to plus full scale. The digital signal
PARCHK is high for EVEN parity and S3.5 thus forces PARSIG high, making
the analog output high. The listing of channels in section 0 indicates those which
may be used to judge a parity problem.
A-3.4 Linear Optical Coupler
The ECG and temperature measurements are transmitted from the floating
section via a linear optical coupler (U202). The coupler has an LED and two
matched photodiodes. One photodiode is used in a servo loop to control LED
illumination. The second photodiode controls the output voltage on the other
side of the isolation barrier. The two photodiodes are matched to produce a very
linear result. The coupler has a raw gain of 1.000 with a tolerance of +17.5% to 23.1%. All analog signals measured from the isolated front end are corrected for
gain and offset errors by reading the ground and precision reference located
within the isolated section.
A-3
Appendix - Technical Supplement
A-3.5 Analog Multiplexer
The analog signals from the floating section are selected by a multiplexer (U67).
The multiplexer selection is chosen by the digital byte loaded via the digital
optocouplers. The eight available channels and their use as a parity check are
shown in the following table.
Signal Name
Description
Parity Error Indication
ECG
ECG signal
N/A
TPROBE
Temperature Probe Code
>4 volts
PACEM
Digital Pacemaker Pulse
>4 volts
TEMP1
1st half of temperature range
N/A
TEMP2
2nd half of temperature range
N/A
LEG
LEG drive signal
N/A
+V4.096
Precision Reference
N/A
AGND
Analog Ground
>4 volts
The table shows that three channels can be used for parity checking, the other
channels may go to the positive limit during normal operation.
A-3.6 Voltage Reference and Ground
The system uses two measurements to establish the offset and gain of all signals
measured via the linear optical coupler. The measurements of ground (to
establish offset) and a precision (U82) +4.096 volt reference (to establish gain)
determine correction coefficients used to correct all signals transferred across the
isolation barrier.
A-4 TEMPERATURE MEASUREMENT CIRCUIT
A-4.1 General
Patient temperature is measured using a thermistor probe. To speed up oral
temperature measurements, the system controls a warmer in the probe tip and
applies a predictive algorithm to the measurement process. The warmer is
controlled to raise the probe temperature to 93 °F (typically) before the probe is
used by the patient. Typical oral temperature measurement time is 4 seconds.
The probe warmer (a 30-ohm resistor in the probe assembly) is driven by a 100
kHz waveform through an isolation transformer (T202). The RMS value of this
waveform is about 3 volts, providing 100 ma RMS through the probe warmer.
The waveform is duty-cycle modulated under system software control to regulate
the probe temperature.
A-4
Appendix - Technical Supplement
A-4.2 Temperature Probe
The temperature sensor is an accurate thermistor in the probe whose resistance
varies with temperature. The temperature circuit applies a constant voltage
(0.4551 volts) to the thermistor at all times. The current through the thermistor
varies with temperature based on its resistance value.
The temperatures (including ambient and over temperature) to be measured by
the NPB-3900 range from 16°C to 44.5°C (60.7 °F to 112.1 °F).
Resistance
Temperature C
Temperature F
Probe Current (µA)
20,000
25.00
77.00
22.76
8,900
44.53
112.16
51.13
13,742
33.78
92.80
33.12
30,100
15.93
60.67
15.12
The chart shows the probe resistance and corresponding current at room
temperature, the high and low extremes, and the resistance (13,742 ohms) for the
center current of the designated range.
A-4.3 Temperature Measurement Circuit
See Figure A-2. The first stage of the circuit is designed to produce an output
signal (TEMP1, from U72A) that spans the voltage range of +4 to -4 volts as the
thermistor covers the full temperature range. The output voltage is highest (+4)
at 112 °F, reaches zero at 93 °F, and goes to -4V at 60 °F. The second stage
signal (TEMP2, from U72B) is a simple analog inverter.
The A/D conversion system reads the result from the first stage (TEMP1) while
its output is positive, otherwise the result is read from the second stage
(TEMP2). The conversion circuit can read slightly negative voltages, so both
stages are active near zero. This arrangement is made so that maximum
resolution can be obtained over the required temperature range.
A-5
Appendix - Technical Supplement
FRONT
A
B
+5ISO
R219
103.5K .05% 5PPM
TP66
F
R190
1K
R217
222K .05% 5PPM
E
TP3
TP67
C1
TP22
C D
TEMP1
+V4.096
0.01UF
1
2 3 U72A
+
R11
20K
TP69
1A J1
1B J1
2A J1
2B J1
3A J1
3B J1
1
4
2
5
3
6
C166
U820.1UF
2 LM4040-4.1
1
25.5K
R19
TP23
C2
R12
5PPM
C6
0.1UF
R18
40.2K
R10
1K
.05%
5PPM
Warmed Probe with
Type Jumpers
+V2.5
7
TL032C
8K .05%
0.1UF
TP4
5 +U10
6 -
AD706J
HTR_DRV C136
HTR_RTN0.01UF
R20
40.2K
TP24
TP31
30.1K .05%
TP11
R218 10PPM
3 +U10
2 -
TP5
-V2.5
1
TL032C
TEMP1
R13
30.1K .05%
10PPM
+5ISO
R14
R21 40.2K
7
TEMP2
AD706J
R15
10K
1%
R16
6 U72B
5 +
10K
1%
R17
200K
1%
100K
1%
TPROBE
TP12
Figure A-2: Temperature Measurement Circuit
Data from the probe manufacturer indicates that the relationship between probe
resistance and temperature is:
Temp( Kelvin) =
1
(Ra + Rb ln( Rt ) + Rc(ln( Rt )) )
3
Where:
Rt = probe resistance in ohms
Ra = 9.69872E-4
Rb = 2.3283E-4
Rc= 8.062E-8
The probe resistance is measured by interpreting the TEMP1 and TEMP 2
voltages from the temperature circuit. The precise probe resistance is determined
from the TEMP1 voltage by this formula:
R PROBE =
24666.6
VTEMP1
+ 1.79549
V REF
If the TEMP1 voltage is zero or negative, substitute -TEMP2 voltage for TEMP1
in the equation above.
The voltages from the temperature circuit should be corrected for gain and offset
using the isolated ground and reference measurements. VREF would be assigned a
value of 4.096.
A-6
Appendix - Technical Supplement
A-4.4 Temperature Probe Keying
The temperature probe has jumper keys that are used to code the various probes
used with the system. Two pins of the probe’s connector (J1) are open or shorted
to ground to indicate the coding. A simple DAC is made using resistors to create
a voltage indicative of the coding arrangement.
Pin 3A
Pin 3B
Code
Voltage (±0.5 volts)
Open
Open
No Probe
3V
Open
Shorted
Cal Key
2V
Shorted
Open
Rectal Probe
1V
Shorted
Shorted
Oral-Axillary Probe
Zero
A-5 ECG INPUTS
A-5.1 General
The ECG section uses three-lead patient connection methodology. The input
signal comes from two leads, while the third lead is driven to minimize common
mode voltages. The three leads are called RA (right arm), LA (left arm) and LL
(left leg). The user can choose from three input lead selections so the signal can
come from RA-LA, RA-LL, or LA-LL.
A-5.2 Input ECG Lead Protection
The three input leads are protected from defibrillator pulses, static electricity,
and other interference sources by 1K resistors built into the ECG cable assembly
and on board MOV surge arrestors. RC filters serve protection and filtering
functions.
A-5.3 Input ECG Signal First Gain Stage.
See Figure A-3. The three input leads pass through analog multiplexers to
differential amplifier U80. Weak pull-ups on the two leads insure that an open
lead will be pulled up to +5V. The differential amplifier is configured for a gain
of 4 with resistors R284 and R285. The junction of the two resistors is the center
of the two input leads, and serves as a monitor for input common mode voltage.
Buffer U75B drives (AC coupled) the shield of the input cable to effectively
minimize input cable capacitance. Buffer U75B also drives integrator U75A with
the common-mode monitor signal.
A-7
Appendix - Technical Supplement
TP33
+5ISO
-5ISO
WHITE
A
TP8
J4
1
75.0K
1K
TP9
LSEL1
10
LSEL2
9
C162
D27
6
120PF
1SMB75C
R252
R266
20M
20M
VEE
B
INH
VSS
VDD
7
C165
0.1UF
8
14
TP44
B
R254
J4
15
2
11
75.0K
1K
1
C150
D25
1SMB75C
5
120PF
2
4
C
RED
8.25K
10
9
NC
3
4
-5ISO
AD620A
TP10
TP29
3
TP19
I/2Y
I/3Y
U78
MC34182D
7
A
B
VEE
VSS
INH
VDD
6
4
5
-VS
+
U75 A
1
LSEL2
REF
(1NA118)
CD4052
LSEL1
C147
0.47UF
8
1%
TP2
3
D24
1SMB75C
J4
TP18
+IN
C168
OIY
TP34
6
OUT
13
75.0K
D
1%
220PF
I/3X
I/0Y
I/1Y
1K
C148
120PF
+VS
-IN
1
TP25
8.25K
R285
I/1X
I/2X
R247
J4
OIX
I/0X
TP49
LL
2
TP1
R284
100
16
C155
12
BLACK
7
U80
100
R265
U79
A
0.1UF
LA
G=4
R287
R278
RA
+5ISO
VEE
R143
8
VDD
16
TP60
10K
TP55
3
TP63
-
MC34182D
2
C142
R227
0.01UF
10K
7
U75 B
+
6
5
Fc=1.6KHZ
TP28
12
14
R291
13
I/0X
I/1X
R1
OIX
75K
100K
J4
5
11
NC
1
5
2
I/2X
I/3X
I/0Y
I/1Y
I/2Y
LEG
TP64
15
E
+V2.5
OIY
R2
TP65
49.9K
3
NC
R234
1K
4
I/3Y
F
C4
J4
TP61
CD4052
6
0.1UF
R9
1.00MEG
Figure A-3: ECG Processing Circuitry, First Stage
A-5.4 ECG Lead Off Detection
The output from the third lead drive amplifier is one of the signals monitored by
the system. Since the third lead is usually the “leg” lead this integrator is called
the leg drive amplifier, and its monitored output is called LEG. Two resistors are
used to bias the output positive so that it can be monitored by the system A/D
converter. The monitored signal represents the LEG drive signal according to the
following table.
LEG Amplifier Output
LEG Monitor Signal
5
2.5
2
1.75
0
1.25
-2
0.75
-5
0
LEG drive signals (corrected for offset and gain errors) in excess of plus or
minus 2 volts (>1.75 or <0.75 on the monitor signal) are an indicator of a lead
off condition.
A-5.5 ECG Second Gain Stage
See Figure A-4. The ECG signal is AC coupled to gain amplifier U73B,
configured for a gain of 35. The low frequency RC cutoff frequency can be
selected to use a 6.8 Meg ohm resistor (0.05 Hz), 750 K resistor (0.5 Hz), or a
1K resistor (340 Hz). The 1K resistor is used to rapidly reset the ECG front end
during transient initial connections or in the event of other major signal
disturbances. The 6.8 Meg resistor is the default selection with digital bits 0.5 Hz
and ECGRES selecting the 750 K or 1 K respectively.
A-8
Appendix - Technical Supplement
+5ISO
-V2.5
R100
374K
1%
R245
TP48
C154
C113
R7
220PF
20K
TP46
Fc=.05HZ
R238
750K
R239
1K
TP58
R249
6.8M
TP53
+
7
U73
-
6
100K
TP45
R240
C152
3.92K
0.01UF
+
U73
3
AD712J
-
2
1
Fc=50HZ
G=2
R223
34.0K
R237
1K
TP59
470PF
0.5HZ
PARCHK
9
6
A
B
C
VDD
VSS
VEE
U2
-
2
3
1
1
BAW56 2
Q
5
12
PM
R
TP75
74HC123
R178
R5
100K
1%
1%
TP39
+5ISO
R255
R212
20K
31.6K
U1
TP52
B
A
B
0.047UF
95.3K
VDD
11
10
+
3
D2
C140
R241
1%
ECGRES
LM393
9
10
11
ECG
1%
TP57
2
1
D22
2.43K
TP47
C139
CEXT
Q
TP51
BAV99
3
AD712J
CREXT
U4
1%
2.43K
1%
7
6
TP56
R6
R251
TP62
5
0.047UF
1%
G=35
Fc=.5HZ
8mS
TP50
20K
TP41
7
TP30
1%
16
8
+
U3
3
C128
0.068UF
VEE
-
2
R8
+V2.5
100K
1%
1
LMC662
TP54
INH
TP43
12
13
2
1
AX
AY
AX/AY
BX
BY
BX/BY
PACEM
TP42
14
-V2.5
15
R4
R206
100K
100K
1%
1%
TP14
5
3
CX
CY
CX/CY
4
PARSIG
4053
Figure A-4: ECG Processing Circuitry, Second Stage
A-5.6 Pacemaker Detection
The ECG signal through the first two gain stages has an upper bandwidth of 1.8
kHz. This bandwidth is high enough to pass the rapid rise time, short width,
pacemaker signal. Differentiator U73A is tailored to recognize this fast rise/fall
signal, and will trigger comparator U2, and one-shot U4B. The one-shot is set for
a width of 8 msec and configured (with external blanking via D2) to be nonretriggerable. The width is enough to guarantee recognition by the system
sampling rate while the non-retriggerable attribute prevents double pulse
recognition. The output pulse is attenuated to become 0-2.5 volts. A voltage >
2.0 volt is considered a logical one.
A-5.7 Monitored ECG Signal
In addition to driving the pacemaker detection circuit, U73 also feeds the last
ECG gain stage U3A. This stage applies a two-pole 50 Hz upper bandwidth and
a gain of 2. The circuit includes an offset to center the output at 2.5 volts. The
resulting ECG signal is monitored by the system A/D converter. Signals >4 volts
or <0.5 volt are indicative of ECG signal overload.
A-6 ON/OFF POWER CONTROL
A-6.1 General
See Figure A-5. The NPB-3900 is turned ON and OFF by alternate button pushes
of the front panel membrane switch. The button is sensed at U301 pin 3. U302
pin 3 produces a pulse for each button push which toggles U303 pin 1 between
the ON and OFF state. A high level on U303 pin 4 resets the unit to the OFF
state from U301 pin 4 when the battery is first connected to the unit, and from
the ALARM signal if the unit operation stops because of watchdog time-out. The
rising edge of the ON signal sets U303 pin 13 which starts the power supplies in
the unit. Unit operation starts only via a push of the front panel button, but
operation will stop based on signals from three possible sources:
A-9
Appendix - Technical Supplement
•
A second push of the ON/OFF button.
•
A processor command PSOFF which will shut the unit OFF.
•
The absence of the watchdog pulse train WDT_PULSE, which triggers an
ALARM.
BAV70
2
D309
1
3
VBATT1
R302
100K
1%
C302
0.1UF
10%
ON/OF
TP420
R301
1.00K
3
1
1%
VBATT
C305
10UF
10%
25v
1
R304
100K
1%
TP460 40494
5
1
1
1
U302
3
1
5 D SE Q 1
U303
3 CL
Q 2
TP447
Q302
3
2
1
TP425
2N4401
R351
10K
1%
1
2
3
4
5
6
7
8
TP458
1
8
1%
9 D SE Q 13
U303
11 CL
Q 12
1
CLR
PWRUP
PWRUP
CLR
U305
VBATT1
TP403
Q12 VCC16
Q13 Q10 15
1
Q14 Q 14
TP450 R312 562K 1%
Q 13
Q
1
R 12
Q
PI 11
Q
1%
R311
49.9K
TP451
10
P0 10
Q
1
GN
P0 9
C307
4060
TP452 1
1
0.01UF 10%TP449
10 CD4013
TP448
1
4071
U302
9
8
PW RGND 500Hz oscillator =
about 15 second delay
R308
100K
1%
VBATT1
R350
10K
1%
PWRGND
O
R305 4 CD4013
4071
PWRGND
100K1%
TP429
D310
ALARM 2
1
BAV70
3
1
PWRRS
TP422
1
U301
R309 TP404
6
7
1
4049
ERLYWRN
R306
C306
49.9k
0.1UF
1%
10%
2N3906
1
1
2
TP444
3
Q301
R307
10K
1%
C308
0.1UF
10%
D304
BAV70
3
R313
100K
6
U301
Positive Pulse
during original
battery connection.
PSOFF
1
1=
0 = OFF Request
TP453
C304 TP456
1000PF10%
1
4049 TP441 R303
2
1
100K 1% 2
U301
BAV70 3
D301
2
TP457
2
PW RGND
100K 1%
R310
PWRGND
100K1%
ALAR
TP445
1
TP470
1
6
5
U302
4
4071
TP419
1
1
PW RGND
Figure A-5: Power ON/OFF Circuitry
A second push of the front panel button will drop the ON signal. While the unit
is still running (PWRUP is high) U302 pin 10 will go low allowing timer U305
to run and masking further ON/OFF button pushes (via D309) until the OFF
cycle is complete. The internal oscillator of timer U305 will create a rising edge
on U303 pin 11 after about 10 seconds, turning the unit OFF. When the timer is
started, the processor receives a signal from U301 pin 6 called ERLYWRN,
which is an early warning signal to indicate that power will be turned OFF. The
processor receives this signal as soon as the user requests the OFF state, and can
clean up stored parameters and make an orderly shutdown.
When the processor wants to shut the unit down, it issues a high PSOFF signal
which raises U302 pin 5. This resets the PWRUP flip-flop and shuts the unit
down. In a normal shutdown procedure, the user issues an OFF command, the
processor responds to the early warning signal, performs the shutdown procedure
(showing a shutdown screen), and terminates the process before U305 times out
by issuing the PSOFF signal.
A-6.2 Processor Watchdog
See Figure A-6. When the unit is powered up and running normally, it makes a
pulse train gated by the watchdog timer called the WDT_PULSE signal. While
this signal is present capacitor, C353 remains discharged. If something happens
to the processor, the watchdog will time out. Regardless of which level the
A-10
Appendix - Technical Supplement
WDT_PULSE goes to, capacitor C353 will charge up in about 500 msec. The
rising edge will clock the ALARM flip-flop (U304) and set the ALARM signal.
The ALARM signal is reset when the battery is first connected to the unit, or by
a push of the Alarm Silence push button on the front panel.
When the ALARM signal is set, it will raise U302 pin 4 and shut off the power
supplies in the unit. It will also reset the ON flip-flop to the OFF state.
A-6.3 Watchdog Alarm
See Figure A-5. When the alarm signal is set, voltage regulator U315 will turn
on, regulating the battery voltage to 5 VDC at pin 8. This 5 VDC will power the
speaker amplifier U313 and oscillator U314. The oscillator will produce an
alarm tone, which will drive the speaker until the alarm silence button is pressed.
ON
TP486
1
3
BAV70
R316
D306
GND
VBATT1
100K
1%
2
1
4049
4049
9
Q300
WDT_PULSE
C309
TP459
2
1
1000PF
10%
3 BAV70
D305
2
1
TP455
1
1%
2N4401
12
11
TP454
1
1
1
1.00K
10
3
TP442
R315
TP461
8
1
U301
U301
9
SET
D
Q
13
Q
12
ALARM
U304
C353
R314
10UF
100K
10%
1%
25V
11
R317
CLR
100K
1%
10
GND
4049
ALARM_SILENCE
CLK
15
14
TP446
TP443
PWRRST
1
13
1
U301
CD4013
U302
11
12
4071
Figure A-6: Watchdog Circuitry
A-7 AUDIO VOLUME AND SPEAKER DRIVE
See Figure A-7. The operational tones produced by the monitor produce the
SPKRFREQ signal. This signal is volume controlled by U310, a digital
potentiometer. The SPKRU/D and SPKR_ADJ_PLS digital signals control the
setting of the potentiometer. The attenuated waveform (from U310 pin 13) goes
to the speaker drive amplifier U313, which connects to the speaker.
A-11
Appendix - Technical Supplement
TP497
1
R318
1.00K
1%
VBATT1
4
7
1
U314
RESET
DISCH
VCC
8
NE555
TP498
3
OUT
2 TRIG
6 THRESH
5 CONT
1
GND
R319
21.5K
1%
1
2
3
4
TP400
1
ALARM
U315
IN
OUT
GND GND
GND GND
OFF SET
MAX603
8
7
6
5
C312
10UF
10%
25V
C31
0.1UF
10%
1
TP499
C310
0.01UF
10%
PWRGND
1
+5V
2
1
BAT54C
SPKRFREQ
TP418
C303
1
10%
0.1UF
C314
TP401
U310
SPKRU/D
SPKR_ADJ_PLS
1
2
3
4
5
6
7
8
U/D
NC1
NC2
INC
NC3
CS
NC4
GND
VCC
NC7
VB
VW
VH
NC6
NC5
VL
16
15
14
13
12
11
10
9
0.1UF
TP417
1
10%
C315
0.1UF
1
10%
1
C313
0.1UF
10%
R320
TP402
1
33.2K
R321
33.2K
TP494
TP495
3
D307
1%
1
2
3
4
R322
33.2K
1%
DS1666S-10
TP496
1
1%
U313
SD
VO2
BP
GND
IN+
VDD
INVO1
LM4862
BOOMER
2 PIN
HEADER
8
7
6
5
1
J4
SPKR
2
J4
C318
0.1UF
10%
PWRGND
Figure A-7: Audio Volume Circuitry
A-8 POWER SUPPLIES
A-8.1 General
The NPB-3900 unit is operated from a 6-volt 4-AH sealed lead-acid battery. The
battery charger provides enough power to charge the battery even when the unit
is operating. Fuse F301 (4A) provides the main power source for the internal
power supplies. Polyswitch F302 (a 1A resettable fuse) provides power to the
ON/OFF and ALARM circuits. If F301 blows, the alarm will still be activated.
A-8.2 General Buck Regulator Design
Several regulators in the NIBP3900 are buck-switching converter designs, a
simplified diagram of which is shown in Figure A-8. In a buck converter (which
provides a reduced, or bucked, output voltage), a series switch applies the input
voltage to the output through an inductor. When the inductor current has built to
a level sufficient to satisfy the load, the switch is opened. The current flowing in
the inductor causes its input lead to fly down until it is caught by the catch diode
at a voltage slightly below ground. The inductor current then diminishes until the
switching cycle is repeated.
A-12
Appendix - Technical Supplement
+
Switch
Inductor
Input
Storage
Cap
"A"
+
Output
Storage
Cap
Vout is more negative than Vin
Load
Vin
"A"
Voltage
Zero
Inductor
Current
On
Switch
Off
Figure A-8: Buck Power Regulator, Simplified Schematic & Waveforms
A-8.3 Battery Charger Power Supply
See Figure A-9. The transformer for mains isolation is external to the NPB-3900.
The external unit provides an isolated 15 VRMS to the DIN connector on the
back of the unit. This AC voltage is rectified by D318 and filtered to produce 16
to 25 VDC on C335. The battery charger is an integrated buck-switching
regulator. The power switch is internal, the output inductor is L306, and the
catch diode is D317.
The regulator contains an accurate output current sense resistor located between
pins 6 and 11, which is used to limit output current during charging. The specific
current limit value is adjusted by R331.
When not in current limit, the output voltage is set to 7.1 volts. In voltagecontrolled operation, attenuator R326/R327 drives U309 pin 5 to 2.5 volts. To
prevent battery drain when the unit is not operating, switches Q309 and Q310
disconnect the attenuator unless the charger receives power. These transistor
switches also drive the front panel LED (via CHRGLED) and provide a
processor input signal (CHRGST) to indicate that charger power is applied.
Diode D308 and transistor Q303 provide a redundant voltage limiting
mechanism at 8 volts in the event of a failure of the primary voltage regulation
mechanism.
A-13
Appendix - Technical Supplement
L307
AC1
20%
6.8UHY
RS403LR
1
D315
C354
2
0.1UF
3
D318
BAV70
2
10%
3
TP421
1
1
4
R354
10
2N4401
1%
3
R334
AC2
TP416
10K
1
Q309
1
1
C335
R333
10UF
Input
1%
TP413
C336
Transformer
2
10K
10%
1%
35V
PWRGND
C333
3300UF
C334
10UF
10%
0.1UF
10%
50V
10%
50V
PWRGND
D30
ZDIODE
7.5
Q303
TP410
3
2
TP405
1
TP440
1
C332
0.22UF
10%
TP411
1
BAV70 3
D316
1
2
3
4
5
6
7
8
U309
16
GN
GN
15
SW VCC2
14
BST VCC1
13
GN PROG
12
OVP VC
11
SNS BAT
10
GN
GN
9
GN
GN
LT1510
1
1
1
1
TP412
20% 33UHY
1
TP426
R300
1K
1%
VBAT
2N3906
1
C330
1UF
10%
25V
C331
0.1UF
10%
TP409
R332
1.00K
D317 1%
MBRS340T3
1
R331
3.65K
1%
1
R329
10K
1%
TP408
L306
2
2N4401
TP407
1
R330
301
1%
R328
10K
1%
3
R326
4.64K
1
TP414
1%
TP406
1
R327
2.49K
1%
C329
47UF
10%
16V
R352
100K
1%
CHRGST
R353
100K
1%
PWRGND
TP415
A-14
CHRGLED
1
Q310
1
Figure A-9: Battery Charger Circuitry
TP480
2
Appendix - Technical Supplement
A-8.4 Power Supply (3.3 volt)
See Figure A-10. The PWRUP signal enables/disables a buck-switching
regulator (U306) that produces a regulated 3.3 volts at C345. The power switch
is integrated within the IC, the catch diode is D312, and the output inductor is
L301.
3.3V REG
VBATT
U306
TP423
PWRUP
1
2
1
TP462
3
1
TP463
C349
C350
47UF
0.1UF
10%
10%
4
1
SHDN
V+
REF
LX
SS
GND
CC
OUT
8
L301
TP438
7
6
1
20%
+3.3V
22UHY
5
MAX763A
16v
C346
C348
1000PF
D312
C345
100UF
1
C347
TP464
330PF
10%
MBRS340T3
0.047UF
10%
C356
47UF
10%
10%
16v
16v
10%
GND
Figure A-10: 3.3V Regulated Supply
A-8.5 Power Supply (5.0 volt)
See Figure A-11. The PWRUP signal enables/disables a buck-switching
regulator (U308) that produces a regulated 5.0 volts at C340. The power switch
is Q308, the catch diode is D314, and the output inductor is L308.
5V REG
VBATT
IRF7204
R335
TP488
1
0.1
5%
2, 3
S
4
G
U308
1
TP424
PWRUP
1
1
C337
C338
0.1UF
22UF
10%
10%
25V
TP487
2
3
4
D
OUT
GND
5/3
EXT
SHDN
REF
CS
V+
8
7
6
5
Q308
5 , 6, 8, 7
L308
+5V
TP489
1
TP439
20%
MAX1626
C339
0.1UF
68UHY
1
C340
D314
MBRS340T3
100UF
10%
16V
10%
GND
Figure A-11: 5V Regulated Supply Circuitry
A-8.6 LCD Bias Power Supply
See Figure A-12. The LCD display requires a negative bias voltage (LCDBIAS)
that adjusts the contrast of the display. The bias supply is thus an adjustable
regulator, controlled by digital signals from the processor. The design is a
modified buck regulator whereby the switch is Q307, the output inductor is
L309, and the catch diode is D313. In the modified design, the output is taken
from the bottom of the catch diode in order to produce a negative voltage. The
output voltage is monitored by the regulator via R336. Output current is limited
by R337. The output voltage setpoint is established by a DAC inside U307 set by
processor signals LCDADJ and LCDCTRL.
A-15
Appendix - Technical Supplement
LCD BIAS
+3.3V
R337
TP468
1
0.33
5%
FZT951CT
3
LCDADJ
LCDCTRL
3
22UF
0.1UF
4
10%
10%
V+
2
C342
C341
8
CS
ADJ
DHI
CTRL
DLO
FB
GND
2
TP466
7
1
6
TP430
5
1
1
TP467
475
1%
MURS120T3
D313
R338
MAX749
25v
Q307
1
U307
1
LCDBIAS
TP465
1
R336
L309
1.2M
5%
20%
C344
47UHY
10UF
25V
C343
GND
100PF
10%
10%
Figure A-12: LCD Bias Supply Circuitry
A-8.7 Backlight Power Supply
See Figure A-13. The LCD display backlight is a cold cathode fluorescent light
(CCFL), which requires a high voltage during normal operation. The starting
voltage may be as high as 1000 VRMS, the running voltage is about 300 VRMS
at 3 ma. This voltage is produced by a resonant Royer oscillator which produces
a sinusoidal output waveform at about 50 kHz. The transistors Q305 and Q306
receive their base drive from the transformer. The output waveform is the result
of the transformer inductance resonating with C352 and the CCFL reflected
capacitance.
The backlight power supply can be disabled by the processor with the
BACKLITE_OFF signal, which cuts out the base drive signal.
BACKLITE
L310
+5V
TP491
20%
1
150UHY
TP492
5
B2
T303
C351
SEC1
1
J303
1
7
TP490
1
1
R343
BACKLITE_OFF
1
TP471
1
1.00K
1%
2
3
Q304
TP427
PRI2
1
SEC2
4
J303
TP493
1
20%
B1
2
2N3906
15PF
2, 4
TP428
R344
PRICT
C352
1
825
3
0.22UF
Q305
1
9
PRI1
10%
1%
3
2, 4
4
CTX210657
1
Q306
GND
3
Figure A-13: LCD Backlight Supply Circuitry
A-8.8 Isolated ±5-Volt Power
See Figure A-14. The isolated patient connection front end receives power from
full bridge driven transformer T1. The two drivers for T201 (U204 and U205)
receive complementary signals called FE_100KHZ. If power is removed from
the front end, both signals are brought to zero, stopping the transformer drive.
Inductors L200 and L201 along with capacitors C220 and C209 serve to reduce
the speed of the waveform edges for high speed EMI reduction.
Figure A-14 also includes the circuitry to supply for the heater, beginning with
the 100 kHz input to U206, and transformer coupled through T202 to the
connector.
A-16
Appendix - Technical Supplement
OPTOCOUPLERS
TP316
10UF
Isolation Barrier
L200
BEAD
10
T201
25V
U204
8
C215
7
6
0.1UF
C220
1
+5V
C214
TP314
5
1000PF
VS
OUT
IN
OUT
NC
GND
GND
1
2
TP311
6
4
C216
L201
1000PF
7
6
BEAD
C209
TP301
TP313
22UF
25V
U205
8
3
5
1000PF
R225
FE_100KHZ
3
MIC4452
8
C225
VS
VS
VS
OUT
IN
OUT
NC
GND
GND
1
2
TP308
FE_100KHZ
3
4
MIC4452
33.2
+5V
TP304
C212
10UF
C206
1000PF
10
T202
L202
TP306
25V
U206
8
C213
1
7
TP318
0.1UF
BEAD
8
6
C211
1000PF
R227
6
5
3
33.2
VS
VS
OUT
IN
OUT
NC
GND
GND
1
HTR_100KHZ
2
3
4
MIC4452
Figure A-14: Isolated ±5V Supply Circuitry
A-9 NIBP SECTION
A-9.1 General
The NPB-3900 contains a pneumatic noninvasive blood pressure system.
Mechanically the system consists of a pump, a proportional valve, and two
pressure sensors. During a blood pressure reading, the system pumps up the cuff
to a specific pressure then bleeds air slowly out while “listening” to the pressure
for the heartbeat. The relative loudness of the heartbeat during the test is used to
determine the systolic and diastolic pressure readings.
A-9.2 Power
See Figure A-15. The control and amplification circuits of the NIBP section have
their own power supply, regulated to +5 from the battery by linear regulator
U2S. The power for the NIBP section is labeled +5VREG, and is enabled by the
processor using NPANPWR.
VBATT
R263
100K
1%
TP359
1
Q205
NPANPWR
R254
1
(P1.1)
20K 1%
3
1
2
TP373
2N4401
1
2
3
VBATT
U210
CTRL
GND
VIN
VOUT
+5VREG
6
5
4
TK11450
C249
C239
10UF
0.1UF
Figure A-15: NIBP Power Sourcing Circuitry
A-17
Appendix - Technical Supplement
A-9.3 Pump Control
See Figure A-16. The air pump is powered from the battery voltage and (for
redundancy) requires that two semiconductor switches be activated for
operation. The NPPVEN signal must be high to turn on the Q210 P channel, and
PUMPPWM must be high to turn on the Q210 N channel. The PUMPPWM
signal can be pulse width modulated by the processor to control the speed of the
pump.
VBATT1
R243
100K
1%
3
TP303
4
Q210
SI9928DY
6
5
R244
33.2
PUMP+
5%
D201
MURS120T3
TP300
C241
3
0.01UF
PUMP-
Q200
1
10%
2
R247
10K
NPPVEN
1%
2N4401
TP328
8
7
SI9928DY
Q210
PUMPPWM
2
1
R246
100K
R245
1%
100K
1%
GND
Figure A-16: NIBP Pump Control Circuitry
A-9.4 Pressure Sensors
See Figure A-17. Two redundant pressure sensors (PS201 and PS202) monitor
the air pressure in the NIBP system. The sensors are powered from the NIBP
+5VREG power and produce an output of 0-5 volts from pressures of 0-360 mm.
Pressure sensor PS210 is used during the NIBP test. It is monitored directly by
the system A/D as an indicator of system pressure. The signal from PS1 is AC
coupled and amplified by U216 to produce the OSC signal monitored by the
system A/D. The OSC signal represents the oscillatory channel used to monitor
the small pressure variations caused by the heartbeat. The first U216 stage
provides AC coupling and buffering. The second stage provides low-pass
filtering and gain (Av=18) , the last stage provides additional AC coupling, gain
(Av=3.6), and adds a DC offset to center the output in the A/D range.
A-18
Appendix - Technical Supplement
Pressure sensor PS202 is monitored by the system A/D and is used as a safety
backup to limit the maximum pressure in the system regardless of software
commands. When the output of PS202 reaches 4.2 volts, comparator U216 will
trip, dropping the NPPVEN signal, which will stop the air pump (via Q210 P)
and open the bleed valve (via Q211 P).
+5VREG
+5VREG
4
5
6
NC
VCC
PS201
NC
VD
C1
GND
DMS873
3
R208
3.92K
LMC660
+
1 R255
U216
2
332K
-
C235
2
3
1.0UF
C233
0.1UF
1
+5VREG
R257
665K
R259
665K
1
+
13 U216
-
TP367
C234
0.1UF
TP368
R266
806K
LMC660
12
R219
10K
1%
C203
680PF
R256
TP387
NIBPRSR1
R218
68.1K
1%
+5VREG
R295
20K
1
10
1.0UF
R262
562K
1
C230
.47UF
LMC660
+
8 TP332 R249
1
9 U216
R269 33.2K
-
C240
14
562K
R286
243K
+5VREG
28K
R276
20K
+5VREG
VBATT2
3
4
+5VREG
4
NC
VCC
NC
VD
R273
3.92K
2
R268
R277
100K
1%
5
TP356
6
1
6
C248
C1
GND
Q211
TP388
1
68.1K
1 0.1UF
R264
68.1K
DMS873
R217
10K
1%
C246
10UF
35V
+
U216
-
7
R216
68.1K
1%
8
3
1
D205
1N4001
NPPVEN3
V201
1
23-Ohm
2
2N4401
Normally
Open
Proportional
Valve
TP357
1
1
U117
NPPVEN
7
8
R209
10K
74VHCT244
C228
.01UF
Q206
TP363
R265
100K
1%
12
6
1
74LVC541
TP370
(P3.7)
C267
680PF
5
TP364
LMC660
NIBPRSR2
C231
.47UF
SI9928DY
R253
100K
1%
PS202
5
R261
182K
3
OSC
R272
TP342
R288
20K
R252
562K
1
C293
0.1UF
30.1K
1
C232
.01UF
TP327
NIBPPWM
15
5
U114
BAT54C
TP312
1
Q211
2
3
1
1
TP326
D202
2
1
SI9928DY
Figure A-17: NIBP Pressure Sensors Processing Circuitry
A-9.5 Proportional Valve Control
See Figure A-18. The single valve used in the NPB-3900 NIBP section vents the
pneumatic system. The valve is normally open when no power is applied. Power
comes from Polyswitch F303 (1A). The valve will close in proportion to the
amount of current passing through it. The current is duty-cycle modulated by the
NIBPPWM signal, which turns on the N channel section of Q11.
A-19
Appendix - Technical Supplement
POLYSWITCH
F303
2
VBATT2
1
1.1A
POLYSWITCH
F302
2
1
VBATT1
1
VBATT
1.1A
SPADELUG
F301
2
2
1 P1
1
SPL301
4A
C301
BAT1
6V,4AH
C316
C317
0.1UF
1000PF
BATTERY
10%
SPL302
47UF
10%
10%
16v
2
GND
2 P1
1
SPADELUG
VBATT1
CLK
1
Q
2
VDD
U301
U304
CLR
CD4013
4
VSS
4049
14
14
VCC
VDD
8 CD4013
GND
7
VSS
4071
14
VCC
U304
3
1
Q
U303
D
SET
U302
6
5
7 CD4013
GND
7
Figure A-18: Proportional Valve Powering Circuitry
A-10 SYSTEM A/D
See Figure A-19. All analog information monitored by the NPB-3900 passes
through the 12-bit high speed sampling A/D, U207. The A/D full scale is set at
4.096 by reference diode D200.
(The schematic includes the circuitry that interfaces with the SpO 2 signal
processing component.)
A-20
Appendix - Technical Supplement
CLARE
Isolation Barrier
ADCS
SIEMENS
LOC-111EV-X1
D
E
F
G
ADCRX
IL300-DEFG-X1X6
.733-.805
ADCTX
.769-.855
.806-.886
.855-.950
.886-.994
.950-1.056
.975-1.072
1.056-1.175
ADCCLK
EOC
20
19
18
17
16
15
14
13
12
11
C200
120PF
100V
R207
IL-300
1
U202
80.6K
8
1%
BIN#
2
7
3
6
4
5
CONN TO AGND
TLC2262C
2
3
U203
+
1
VCC
U207
AIN0
EOC
AIN1
I/OCLK
AIN2
DATA/IN
AIN3
DATA/OUT AIN4
CS
AIN5
REF+
AIN6
REF-
AIN7
AIN10
AIN8
AIN9
GND
PWRUP
1
2
3
4
5
6
7
8
9
10
NIBPRSR1
NIBPRSR2
OSC
+3.3V
TP324
R235
49.9K
1%
+5VREG
R233
10K 1%
R232
10K
1%
TLC2543
TP317
VBATTAD
TP305
VOUT
R234
49.9K
1%
CONN VIA TO GND
AT PIN 10
AD_RTN
AT J20 PIN 9
R231
AGND
TP323
10K
+5V
1%
R242
10K
1%
L205
+5AD
TP321
BEAD
C210
0.1UF
+4REF
R230
1K
1
TP319
C219
0.1UF
D200
2
LM4040-4.1
Figure A-19: A/D Circuitry
Signals processed through the A/D Converter are listed in the following table,
and they correspond to channels identified in the schematic.
Channel
Signal
1
Isolated Front End Channels
2
NIBP Pressure Sensor 1
3
NIBP Pressure Sensor 2
4
NIBP Oscillatory channel
5
Battery Voltage (÷2)
6
Ground
7
+3.3 volt Power Supply
8
Ground
9
NIBP +5 volt power (÷2)
10
Ground
11
+5 volt power (÷2)
A-21
Appendix - Technical Supplement
A-11 BUTTONS AND LIGHTS
The NPB-3900 front panel contains 5 membrane switches and two lights brought
to the main board through J2. EMI-reducing R/C networks are applied to each
line.
Signal
Function
CHRGLED
LED, on when charger connected
STNDBY
LED, blinks when unit in standby mode
ON/OFF
Button, turns unit ON and OFF
ALARM_SILENCE
Button, silences ongoing alarms
NIBPPB
Button, initiates NIBP measurement
AUDTONVOL
Button, allows volume adjustment
LCDCONTRST
Button, allows LCD contrast adjustment
A-12 SpO2
A-12.1 General
See Figure A-20. The NPB-3900 contains a saturated blood oxygen measurement
system using pulse oximetry techniques for noninvasive monitoring. The SpO2
section is a separate minisystem with its own analog section, A/D converter, and
microprocessor. The SpO2 section resides in the isolated portion of the
NPB-3900 and receives +5ISO and -5ISO DC power via transformer T201. This
section communicates via RS-232 digital transfers through optical isolators
U208 and U209.
The SpO2 function is built around an 80C552 microcontroller, and the function
consumes approximately 0.5 watts.
The SpO2 function incorporates C-Lock ECG synchronization to allow
measurements on patients with low perfusion or in the presence of patient
motion. An ECG synchronization signal is used to prevent erroneous indications
in the SpO2 measurements during ECG measurements.
A-22
Appendix - Technical Supplement
Isolation Barrier
+3.3V
U208
+5ISO
R237
1
2
NC
VCC
VE
OUT
1.50K
JX2
AGND
AGND
ANODE
CATHODE
AGND
AGND
RCAL_RTN
RCAL
-LED
+LED
JX1
1
3
7
2
1
4
5
8
10
6
7
9
8
-5ISOSP
TX
3
4
-5ISO
L203
5
NC
GND
BEAD
SPO2
10
RX
+5ISOSP
+5ISO
L204
13
C217
0.1UF
6
2
SP02RX
R241
2.43K
+5ISO
BEAD
C218
0.1UF
5
CTS
12
R239
14
+3.3V
U209
R238
2.43K
3
11
R236
1.50K
CNW139
4
9
8
7
6
2.43K
AGND
8
7
6
VCC
VE
OUT
NC
5
NC
1
2
3
4
R240
SP02TX
1K 1%
GND
CNW139
Figure A-20: Interfacing with SpO2 Processing
A-12.2 Functional Interconnections
Other than supply voltages provided to the SpO2 function, there are three data
signals utilized in the SpO2 function:
CTS*
clear to send a logic signal (active low, designated by “*”)
transmitted to the module by the monitor function to suspend
data transmission from the SpO2 function
RX
is the receive data line to the SpO 2 function
TX
is the transmitted data line from the SpO 2 function
A-12.3 Oxichip Circuit
At the heart of the SpO2 function is the Oxichip  integrated circuit U1, which
provides variable LED drive, photodetector amplification, variable gain,
demodulation, filtering, and signal conditioning for the analog-to-digital
converter (ADC) input. The Oxichip circuit generates its own LED modulation
and photodetector demodulation timing. It requires a single clock at *x, the
desired LED switching frequency. A block diagram of the Oxichip is shown on
sheet 2 of the schematic. The Oxichip circuit pin descriptions are provided in
Table A-1.
Table A-1: Oxichip Circuit Pin Descriptions
Pin Name
Pin #,
type
Signal Description
CS*
1, DI
Chip Select, latches the data bus into the storage
registers. Connected to WR* U4 P3.6.
LE
2, DI
Latch Enable, enables writing to the storage register.
Connects to U4.P1.1.
CYCLE
3, DO
Indicates whether the Oxichip circuit is in Red or IR
cycle. High is Red, Low is IR. Connects to U4.P3.3.
CLH
4, LP
High side current limit protection. Connect to LED
supply voltage through 10-watt resistor in parallel
with a 220 µF capacitor.
A-23
Appendix - Technical Supplement
Table A-1: Oxichip Circuit Pin Description - (Continued)
Pin Name
A-24
Pin #,
type
Signal Description
LEDPOS
5, LO
+LED connection to sensor.
LEDNEG
6, LO
-LED connection to sensor.
CLL
7, LP
Low side current control. Connects to LED supply
return through 10 watt resistor.
GATE
8, DO
Combined gate signal, rising edge initiates a
COMPARE A/D conversion. Connects to
U4.STADC.
SATIN*
9. DO
LED on or off status indicator, high is off, low is on.
Connects to U3.P4.3.
RESET*
10, DI
Input to Schmitt Trigger for generating a reset.
SRT
11, DO
Output of Schmitt Trigger, active high reset pulse.
VSS
12, DP
Digital power return.
VSSA
13, AP
Analog power return.
FR3OUT
14, AO
Red filter chain, op amp 3 output.
FR3NEG
15, AI
Red filter chain, op amp 3 inverting input.
FR2OUT
16, AO
Red filter chain, op amp 2 output.
FR2NEG
17, AI
Red filter chain, op amp 2 inverting input.
FR1OUT
18, AO
Red filter chain, op amp 1 output.
FR1NEG
19, AI
Red filter chain, op amp 1 inverting input.
RED
20, AO
Red demod/demux output.
PGAOUT
21, AO
Programmable gain amplifier output.
SOUT
22, AO
Ambient light auto-null amp output.
SINNEG
23, AI
Ambient light auto-null amp inverting input.
SWITCH
24, AO
Ambient light auto-null switch output.
A2OUT
25, AO
Photodetector amp 2 output.
A2INNEG
26, AI
Photodetector amp 2 inverting input.
A1NPOS
27, AI
Photodetector amps 1 and 2 non-inverting inputs.
A1NNEG
28, AI
Photodetector amp 1 inverting input.
A1OUT
29, AO
Photodetector amp 1 output.
VREF
3125
30, AO
3.125 volt reference output.
Appendix - Technical Supplement
Table A-1: Oxichip Circuit Pin Description - (Continued)
Pin Name
Pin #,
type
Signal Description
VREF25
31, AO
2.5 volt buffered reference output.
VREF22
32, AO
2.2 volt reference output.
IR
33, AO
IR demod/demux output.
FI1NEG
34, AI
IR filter chain, op amp 1 inverting input.
FI1OUT
35, AO
IR filter chain, op amp 1 output.
FI2NEG
36, AI
IR filter chain, op amp 2 inverting input.
FI2OUT
37, AO
IR filter chain, op amp 2 output.
FI3NEG
38, AI
IR filter chain, op amp 3 inverting input.
FI3OUT
39, AO
IR filter chain, op amp 3 output.
LS
40, AO
Level shifted and multiplexed output to ADC.
VDDA
41, AP
Analog power.
VDD
42, DP
Digital power.
RED-IR*
43, DI
Multiplexer select input, high is Red, low is IR.
Connects to U4.P1.2.
CLK_16
44, DI
Clock speed select, high is 128xfMOD, low is
8xfMOD.
CLK
45, DI
Clock input.
D4
46, DI
Data bit 4. Connected to AD4.
D3
47, DI
Data bit 3. Connected to AD3.
D2
48, DI
Data bit 2. Connected to AD2.
D1
49, DI
Data bit 1, Connected to AD1.
D0
50, DI
Data bit 0. Connected to AD0.
LIM
51, DO
Overcurrent limit indicator, high indicates current
limit has tripped. Connected to U4.P4.6.
EN*
52, DI
LED enable, high disables LED drive, low enables
LED drive. Connected to U4.P1.0.
A-25
Appendix - Technical Supplement
A-12.4 Preamplifier
NOTE: In the following discussion, parts that are internal to the Oxichip circuit
are noted with a “U1.” Prefix.
The current-to-voltage (I-to-V) converter has a gain of -249K V/A and a lowpass corner frequency of 30 kHz. The voltage amplifier has a gain of -2 V/V and
a low-pass corner frequency of 20 kHz. The voltage amplifier is disconnected
from the I-to-V converter during LED switching transients to prevent
transmission of the switching spikes into the Programmable Gain Amplifier
(PGA).
The ambient light canceller (ALC), which consists of U1.A3, R6, and C6,
generates a current opposing the DC current coming from the photodetector,
which is caused by ambient light. The ALC switches on during the Red cycle
and has a closed-loop frequency of 240 Hz. It can cancel up to 36 µa of DC
photocurrent. The response time to a change in LED drive is less than 2 ms.
The RC filter that removes sensor cable noise is comprised of R1 and C49.
Component CR4 serves as an ESD-protection diode.
A-12.5 Programmable Gain Amplifier (PGA), Demodulator and Demultiplexer
The PGA (U1.A4) provides a variable gain to accommodate a wide range of
signal strengths. As the PGA amplifies the signal from the preamp by a
programmable gain, the demodulator shifts the frequency down to baseband,
while the demultiplexer separates the IR and Red components of the signal. The
PGA has a programmable gain from 1 to 128 in powers of 2.
The PGA output goes to the peak detectors for status monitoring and to the
demodulator/demultiplexer (U1.A5, which is internal to the Oxichip circuit) for
signal processing.
There are two peak detectors: one detects positive peaks (above the 2.2-volt
reference) and one detects negative peaks, or valleys (below the 2.2-volt
reference). This measurement point is referred to as COMPARE2, or C2. The
peak and valley detector circuitry consists of CR3, R26, R41, R42, C42, and
C41.
The response of the peak detectors is nonlinear since the CR2 diode impedance
changes as the voltage on the diode changes. The changing time constant is
limited to no faster than 20.8 µs. The delay time constant is 19.8 ms.
A-12.6 Filters and Level Shifter
The filters and level shifters are shown on the schematic sheet 2.
The 10 Hz filters eliminate the high frequency components of the optical signal
and get it ready for conversion to a digital signal, thereby smoothing out the Red
and IR signal from the demutiplexer. The gain of the Red filter is eight, while the
gain if the IR filter circuit is five.
A-26
Appendix - Technical Supplement
The Red filter circuit components consist of U1.A6-8, R19-21, R31, R34-37,
C22, C29-30, and C37-38. The IR filter circuit components consist of U1.A1012, R22-24, R32-33, R38-40, C23-24, C31-32, and C39. The IR filter is identical
to the Red filter except for the component values in the last stage.
The level shifter moves the reference for the signal back to ground. The level
shifter (U1.A9) selects the desired signal and shifts the signal reference from 2.2
Vref to ground, or 0 volts. This circuit has a gain of two and an intentional offset
of 80-120 mV at the output.
A-12.7 LED Driver
The LED driver circuit generates regulated and programmable currents for
driving the sensor LEDs. The circuit switches the current in the proper phases of
the LED strobe cycle. The IR and Red currents can be programmed
independently. The LED currents are generated by forcing a programmable
voltage across R9, then switching the resulting current through the LEDs.
The LED driver is almost entirely contained within the Oxichip circuit. This
driver also has an over-current detection feature that shuts down all LED drive if
the average current exceeds 44 ma. The over-current trip level is set by passing
the LED current through R10 and C9 and comparing the voltage drop to VDD-0.3
V. Components CR5 and CR6 serve as ESD-protection diodes. See schematic
sheet 2.
A-12.8 References
There are three voltage references on the Oxichip circuit. The 3.125 V reference
is used for Rcal stimulus and the high resolution A/D converter reference. It is a
low-impedance output. The 2.2 V buffered reference is used as the signal ground
for the photodetector cathode and is a low-impedance output. The 2.2 reference
is used for signal ground in the rest of the circuit. It is a high-impedance output
and is filtered by C3.
A-12.9 Reset Schmitt Trigger
The power-on reset function is accomplished with a Schmitt Trigger inside the
Oxichip circuit and external components R45 and C44. The Schmitt Trigger
supplies an active high reset to the processor on RTS. Diode CR2 protects the
Oxichip circuit from the discharge of C44.
A-12.10 High Resolution A/D Converter
The oximetry function uses a Crystal Semiconductor CS510A 16-bit A/D
converter for the conversion of the filtered optical signals and for Rcal
measurements. This A/D converter is shown on schematic sheet 2 as U2.
A-12.11 Input Filter
The input filter of U2 is through the level shifter circuit, which consists of R18
and C13. The Rcal filter circuit consists of R17, C20-21.
A-27
Appendix - Technical Supplement
A-12.12 Power Decoupling
The power supply decoupling circuit consists of R29, R30, C16-18, C28, and
C26-27.
A-12.13 Status and Timing
The LED drive, ALC, demodulator, and demultiplexer require timing signals to
operate properly. All the proper timing sequences are provided by the state
machinethe OXICLK signalwithin the Oxichip circuit. The state machine
requires a clock from the CPU at 8x the desired LED strobe frequency.
A-12.14 Analog Power Regulation
The oximetry function analog functions are powered by Ù5 VDC. Analog
filtering is provided by R15-16 and C11-12.
A-12.15 Microcontroller
The oximetry module microprocessor is an 80C552 IC (U4) with 64K ROM
(U3), 32K RAM (U7) and an address latch (U6). The connection to the Oxichip
circuit gain is the data bus.
A-13 MICROCONTROLLER
A-13.1 General
See Figure A-21. The microcontroller is an Intel 386EX with a 16-bit data bus
and a 24-bit address bus, of which we use 19 bits. There are eight control signals
used, ADS#, W/R#, D/C#, M/IO#, WR#, RD#, BLE#, and BHE#. The processor
requests and receives instructions from the flash memory. The DRAM memory
is used for storage of variables, etc.
A-28
Appendix - Technical Supplement
386EX PIN
ASSIGNMENTS
WDTOUT
WDTOUT
ADS, W/R, D/C, M/
IO,
RD, WR, BLE, BHE
DBO-DB15
ADCCLK
ADCTX
ADCRX
UART
FPGA
DRAM
FLASH
SPO2TXX
SPO2TXX
EARLYWRNG
UARTINT
SSIOCLK
SSIOTX
SSIORX
A1-DB18
RST
CLK2
CS4
CS3
CS6
UCS
TXD0
TXD0
INT5,INT7
INT2
DREQ0
DACK0
DREQ
DACK
NC
NC
INT6
INT4
J204-1
J204-2
TXD1
RXD1
386EX
C STEP
CONTROL
SIGNALS
18 BIT
ADDRESS BUS
16 BIT
ADDRESS BUS
RESET
READY
P1.7
P1.5
40MHZ
READY
LCDCNTL
LCDADJ
P1.4
P1.3
P1.2
P1.1
P1.0
P2.7
P2.2
P2.1
P2.0
P3.7
CHRGST
JP120
JP101
JP102
FLSHBSY
SPKRU/D
RTCWR
RTCDATA
RTCCLK
NPPVEN3
RTCCE
PSOFF
NPANPWR
P3.6
P3.5
P3.3
P3.2
TMROUT0
TMROUT1
PROBEST
SPKR_ADJ_PLS
TMROUT1
TMROUT2
PS_100KHZ
Figure A-21: Microcontroller Signal Assignments
A-13.2 Signal Connections
The 386EX uses its data and address bus along with eight control signals to read
and write to the DRAM, flash, UART, and FPGA. Other interface connections
are made through the I/O port signals, timer signals, interrupt signals,
asynchronous port signals, and the synchronous port signals. These signals are
shown in Figure A-21.
A-13.2.1 Reset
This signal is an input to the 386EX and is generated by the voltage detector,
VR102, and FPGA circuits during power up. It resets all of the internal registers
and synchronizes the internal clocks.
A-13.2.2 40MHz Clock
The main system clock is generated by oscillator X103, which generates a
40MHz clock signal which is routed to the processor and FPGA. The processor
divides this clock by 2 and internally generates a PH1 clock and a PH2 clock.
These internal clocks control all of the processor’s signal generation.
A-29
Appendix - Technical Supplement
A-13.2.3 Ready
The processor generates the READY signal whenever it has been programmed to
generate READY signals. As an example, when a DRAM access occurs, which
has one wait state, the Chip Select Unit in the processor will generate the
READY signal to end the DRAM cycle.
A-13.2.4 Standby
This bit is port bit 1.5 and is programmed by the software to turn a LCD display
on and off to indicate that the NPB-3900 is on but in power save mode, and
touching any button or the knob will bring the LCD display back to life.
A-13.2.5 LCDCRTL and LCDADJ
These signals are used together to adjust the LCD contrast voltage up and down.
Software generates these signals via port bits 1.7 and 1.6, respectively. The
LCDCRTL signal selects the Dallas digital potentiometer and the LCDADJ
signal adjusts the potentiometer up to generate the proper negative bias voltage
to the LCD display. See paragraph 5.5.
A-13.2.6 NPANPWR
This signal is at port bit 3.3 and the software programs it high to turn the NIBP
power on. When low, the NIBP power is off.
A-13.2.7 SPKRU/D and SPKR_ADJ_PLS
These two bits, port bits 2.7 and TMROUT0 respectively, work together to
adjust the Dallas audio potentiometer to control the speaker volume.
A-13.2.8 RTCE, RTCWR, RTCDATA, RTCCLK
These signals are connected to port bits 3.6, 2.2, 2.1, and 2.0, respectively. They
are programmed by the software to generate the necessary signal levels to read or
write to the RTC.
A-13.2.9 PSOFF
Port bit 3.5 is used to turn the power supply of the NPB-3900 off. Software
controls this and it is usually activated after an EARLYWRNG signal
(INT5/INT7) has been received from the power supply to indicate that the off
button has been pushed.
A-13.2.10 PS_100KHZ
This signal is generated from the internal timer 2 unit and is programmed by
software to generate a 100 kHz signal which goes to the FPGA and in turn is
anded with the WDT signal to generate the SYNC ALRM to the power supply
circuits.
A-13.2.11 CHRGST
This input on port bit 1.4 is from the power supply circuit and is used to indicate
that the battery eliminator is connected to the NPB-3900 and is charging the
battery.
A-30
Appendix - Technical Supplement
A-13.2.12 PROBEST
Input port bit 3.2 is the probe status bit and is generated by a microswitch to
indicate whether the temperature probe is installed in its housing (low) or has
been removed (high).
A-13.2.13 NPPVEN3
This input port bit 3.7 comes from the NIBP circuit and indicates that the NIBP
circuit has been turned on and is enabled.
A-13.2.14 WDTOUT
This output is from the processor’s Watchdog Timer Unit and is a clock signal
that is combined with the PS_100KHZ signal. It is low and is kept low by the
software retriggering the WDT unit. If the software fails to update the WDT unit,
the signal will go high and the flip-flop is set high, inhibiting the signal thus
causing the power supply to shut down.
A-13.2.15 ADCCLK, ADCTX, ADCRX
These signals are connected to the Synchronous Serial Unit within the processor
and control the ADC in the NPB-3900. The processor’s DMA1 channel initiates
a DRAM memory transfer to the SSU and the 16-bit word is serially output to
the ADC and the front-end. Each data bit on the ADCTX line is strobed into the
ADC and the front end serial shift register on the leading edge of the ADCCLK
signal. At the same time, the ADC puts out the previous conversion’s data on the
ADCRX line. This data is input to the SSU and the data is read by software. The
first byte of the ADCTX line controls the ADC and the second byte is decoded
by the front end to choose the analog mux channel routed to the linear opto and
to select the ECG leads. The STXCLK signal is generated in the FPGA.
A-13.2.16 UART, FPGA, DRAM, FLASH CHIP SELECTS
These signals are generated by the processor’s Chip Select Unit and are
generated each time the address space which corresponds to the signal is
enabled. Only one of these signals can be true at a time and the software
programs the address space for each of these signals. These signals are all low
true. The DRAM is connected to CS6# and requires 1 wait state, the Flash is
connected to UCS# and requires one wait state, the FPGA is connected to CS3#
and requires 0 wait states, and the UART is connected to CS4# and requires one
wait state.
A-13.2.17 SpO2TX and SpO2RX
These signals are from the processor’s Asynchronous Serial Unit and is used to
interface to the SpO2 section. All data and control information is passed back
and forth between the processor and the SpO 2 section via these two signals.
A-13.2.18 EARLYWRNG and UARTINT
These two signals are interrupts, EARLYWRNG from the power supply circuit
and UARTINT from the UART. The EARLYWRNG signal is connected to
INT5 and INT7, and goes high to tell the processor that the unit’s off button has
been pushed. The UARTINT signal is generated by the UART to indicate that
the transmit buffer is empty or the receive buffer is full.
A-31
Appendix - Technical Supplement
A-14 PROGRAM STORAGE/EXECUTION
A-14.1 General
The program for the NPB-3900 is stored in a 256K X 16 flash, U111. The flash
is address-mapped in the upper 512k byte address space and requires one wait
state (100ns) for reading or writing to the flash. Upon powering up, the processor
requests and receives an instruction at location FFFFF0 hex, utilizing the address
bus, signal UCS# from the chip select unit within the processor, and the data bus.
The executable flash is a word oriented flash, that is, reading and writing is done
on a word basis, and byte reads and writes are not allowed.
The chip select unit has UCS# assigned to the executable flash. The executable
flash is assigned the upper 256k words, or 512k bytes in the system. The word
address space is 40000-7FFFF hex, which is 80000-FFFFF hex in bytes.
The executable flash requires one wait state for reading and writing. It has a long
delay from output data on to output data float. This requires that data buffers be
installed between the 386EX and the flash. Since doing this only for the flash is
awkward, the buffers were put in for all external devices.
The read cycle time for the executable flash is 100 nanoseconds (ns). The write
pulse width must be at least 50 ns. Refer to the timing diagrams for the flash for
minimum timing parameters. See Figure A22.
25ns
25ns
50ns
T1
25ns
50ns
T2W
50ns
T2
25ns
CLK2
PH2
UCS#
RD#
Figure A-22: Flash Timing Parameters
Writing to the flash has the same timing as above, except that the read signal is
replaced with the write signal.
A-32
Appendix - Technical Supplement
A-15 DRAM CONTROL
A-15.1 General
The DRAM control consists of one 256Kx16 DRAM chip (U113), three
74AC157 address mux chips, address resistors, and the FPGA control circuit.
CS6# has been assigned to the DRAM memory address space, 0-3FFFF hex
words, or 0-7FFFF hex bytes. The CS6# control register in the chip select unit
(CSU) must be programmed for 1 WAIT STATE. Since the data bus is 16 bits
wide and the DRAM is a x16 part, most transfers will be of the 16-bit variety.
However, 8-bit transfers are allowed, and we have made provisions for byte
addressing. This is done by using the upper and lower cas signals, UCAS and
LCAS.
A-15.2 DRAM Timing
See Figure A-23. For the DRAM design we must generate 6 signals: RAS#,
UCAS#, LCAS#, DRAMOE#, DRAMWR#, and CASADREN. All of these
signals are generated in the FPGA from the 386EX signals, ADS#, CS6#,
M/IO#, D/C#, WR#, and RD#. Since the CSU is programmed for one wait state,
the CSU generates the READY# signal, which terminates the transfer.
25ns
25ns
50ns
T1
50ns
50ns
T2W
T2
T1
CLK2
PH2
75ns
RAS#
CASADREN
50ns
50ns
U/LCAS
DRAMWR#
75ns
75ns
DRAMOE#
Figure A-23: DRAM Timing Parameters
The DRAM requires 130 ns total time, read/write and precharge for each cycle.
There is one wait state for each DRAM access and a total of three T states which
is 150 ns. Since the DRAM minimum access time is 130 ns, we have 20 ns of
A-33
Appendix - Technical Supplement
margin. We are using the Hitachi HM51W4260AL, which has a RAS# time of
70 ns, a precharge time of 50 ns, a CAS# time of 20 ns, and a WE# time of 15 ns.
The BLE# and BLH# signals are used to select byte-oriented reads and writes.
There are 2 CAS# lines, which are used to implement the byte writes.
The RAS# and CAS# requirements are shown in Figure A-24.
70NS
50ns
RAS#
0ns 10ns
ROW/COL ADDR
VALID ROW VALID COL
0ns 15ns
UCAS/LCAS#
20ns
20ns
Figure A-24: RAS and CAS Timing
A-15.3 DRAM FPGA CIRCUITS
The DRAM control circuits in the FPGA must decode the various 386EX control
signals and generate the DRAM signals. This is done by using CS6# to set a flipflop when ADS# and PH2 are true. When this is true, a flip-flop is set, which is
output as RAS# and is 75 ns long. This signal is generated for all DRAM
accesses and refresh. The DRAM output is enabled when either BLE# or BHE#
is true, which means a read is occurring. Since the DRAM outputs are bidirectional, we need to disable the DRAMOE# signal if a write is taking place.
The WR# signal being false allows DRAMOE# to occur, and if it is true, then
the DRAMWR# signal occurs. The BLE# and BHE# signals are also used to
generate the UCAS# and LCAS# signals during a read or write operation. Since
we are using RAS only for refresh, the CAS signals must be inhibited for refresh.
A-16 REAL TIME CLOCK (RTC)
A-16.1 General
The RTC is a 14-pin package (U120) with an internal crystal. Power connections go to
3.3V, which is separate from the main 3.3V and is generated from the battery via U103.
When power shuts off, this 3.3V will still power the RTC and it will continue to keep time.
The RTC is an Epson with part number RTC-4543SA. It interfaces to the processor via
four port pins, P3.6, P2.1, P2.2, P2.3, which are software pr ogrammable. The software
must generate the correct timing on these pins to read and write to the RTC.
A-34
Appendix - Technical Supplement
A-16.2 RTC Timing
A-16.2.1 Read Operation
CE
WR
CLK
DATA
Figure A-25: Read Timing
When the WR signal is low and the CE signal is high, the RTC enters the data
output mode.
At the first rising edge of the CLK signal, the clock and calendar data are loaded
into the shift register and the LSB of the seconds digit is output from the DATA
pin.
The remaining seconds, minutes, hour, day of the week, day, month, and year
data is shifted out in sequence and in synchronization with the rising edge of the
CLK signal so that the data is output from the DATA pin.
A-16.2.2 Write Operation
CE
WR
CLK
DATA
Figure A-26: Write Timing
When the WR signal is high and the CE signal is high, the RTC enters the data
input mode.
A-35
Appendix - Technical Supplement
In this mode, data is input in succession and in synchronization with the rising
edge of the CLK signal, to the shift register from the DATA pin, starting from
the LTS-B of the seconds digits.
After the last data is input to the shift register at the rising edge of the 52 nd clock
pulse, the contents of the shift register are transferred to the timer counter.
A-17 UART OPERATION
A-17.1 General
The NPB-3900 has one UART. CS4# selects the UART and data is written and
read via the data bus. A Maxim 211E (U119) translates the UART signals to
RS-232 voltage levels.
The NPB-3900 and recorder have RS-232 male interface connectors. They are
connected using a null modem cable with female connectors. The pin
assignments are shown below.
A-17.2 NPB-3900 Connections to Printer
Connector
Connector
NPB-3900
Null Modem Cable
Recorder
(Male)
Female --------------------------Female
Male
NC 1
1
1
1 NC
<<<<
RX 2
2
3
3 TX
<<<<
>>>>
TX 3
3
2
2 RX
->>>>
>>>> RESET 4
4
6
6 RESET >>>>
<< >> GND 5
5
5
5 GND
<<<<
DSR 6
6
4
4 NC
>>>>
RTS 7
7
8
8 CTS
>>>>
<<<<
CTS 8
8
7
7 RTS
<<<<
>>>> ALM 9
9
9
9 NC
<< >>
The RS-232 signal levels are defined in the following paragraphs.
Signals are considered to be in the MARK (“1”) state when the voltage is more
negative than - 3 volts with respect to ground. Signals are considered to be in the
SPACE (“0”) state when the voltage is more positive than + 3 volts with respect
to ground.
For data signal lines, TX and Rex, the signal is considered to be in the binary “1”
state when the voltage is more negative than - 3 volts. The signal is considered to
be in the binary “0” state when the voltage is more positive than + 3 volts.
A-36
Appendix - Technical Supplement
1
0
1
1
Figure A-27: Data Signal
Control signals, DSR, RTS, RST, and CTS are considered to be ON when the
voltage is more positive than + 3 volts, and considered to be OFF when the
voltage is more negative than - 3 volts.
OFF
ON
Figure A-28: Control Signal
A-18 FPGA GLUE LOGIC
The Actel FPGA (U105) is a 3.3V, 4000 gate device which contains
miscellaneous control and glue logic for the NPB-3900. It is packaged in a 100pin TSOP. The register map for writing and reading follows.
HEX
Address
Write
Read
# Bits
Data Bus Bits
300
Pump PWM
Same
8
D7-D0
302
Valve PWM
Same
10
D9-D0
304
Heater PWM
Same
10
D9-D0
306
Speaker Duty
Cycle
Same
16
D15-D0
308
Control Reg
Same
16
D15-D0
30A
Reset Knob
Int Knob/Misc
9
D11,D10,D7-D2
30C
WDTEN
Push Button
5
D7-D3
30E
LCD Data
Same
16
D15-D0
…
Frequency Rate
Variable
8
D8-D0
…
A-37
Appendix - Technical Supplement
The FPGA contains the following control circuits.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
DRAM control
PUSH BUTTON detect
RESET/CLOCK PHASE control
CONTROL REGISTER control
READ-BACK multiplexer
PUMP/VALVE PWM
TEMPERATURE PROBE HEATER PWM
SPEAKER FREQUENCY generator
KNOB detect
A/D CONVERTER SELECT control
Miscellaneous circuits
A-18.1 DRAM CONTROL
The DRAM control circuits consist of a small state machine to generate RAS#,
LCAS#, UCAS#, DRAMOE#, WRITE#, CASADREN#, FDRRD, and
ENDTABFR. The process of reading, writing, and refreshing the DRAM is
controlled by these circuits.
A-18.2 PUSH BUTTON DETECT
When a membrane switch is pressed, a low true signal occurs. All of the
membrane switches are ored together to generate the PBINTPD signal which is
read via address 30A hex, bit 6, of the status register. The software polls the
status register at a known rate and checks to see if this bit is set.
A-18.3 RESET/CLOCK PHASE CONTROL
When power is turned on, a reset signal is entered on pin 64. The RESETFF is
set true on the next CLK_40MHz rising clock edge and RESET exits on pin 47.
This is the master reset signal for the whole board and the 386EX. At the same
time, it is required to make sure that the control circuits are in sync with the
386EX, and this is done by generating our own phase 1 (CLK_PH1) and phase 2
(CLK_PH2) signals. CLK_PH1 starts as soon as RESET goes low. CLK_PH2
always follows CLK_PH1 and is the inverse of CLK_PH1. These clocks are
50% duty cycle clocks running at 20MHz(50 ns period). Each T state of the
processor is composed of 2 phases or clock states, first CLK_PH1, then
CLK_PH2, and is 50 ns long.
A-18.4 CONTROL REGISTER DECODE CONTROL
The CONTROL REGISTER is a 16-bit register with miscellaneous
programmable control bits. These 16 bits are programmable and can be read
back via the READ BACK MULTIPLEXER.
A-38
Appendix - Technical Supplement
A-18.5 READ-BACK MULTIPLEXERS
The read-back multiplexers allow the software to read back the registers
programmed, the knob and push buttons, and other miscellaneous signals. The
explanation of this circuit is in the register section on the page 3 schematic
explanation.
A-18.6 PUMP PWM CONTROL
This circuit consists of an 8-bit holding registers and 8-bit up/down counter,
being clocked at 313 kHz. This circuit is used to control the NIBP pump by
generating a pulse width modulated signal that drives the pump. The pump PWM
signal exists on pin 3. The enable for this signal is the PWM_GO signal in the
CONTROL register.
The software loads a value into the 8-bit holding register. The counter is clocked
by a 313 kHz clock. When the counter overflows, the value in the holding
register is loaded into the counter synchronously with the 313 kHz clock. The
counter operates as a count-up then count-down circuit, always generating the
same frequency, but with different duty cycles.
Once a value is loaded into the counter, the counter counts up until it overflows.
If PUMP_PWM_GO is true, then the PUMP_PWM_FF is output on pin 3. When
the counter overflows, the PUMP_PWM_FF changes state, and the counter is
reloaded with the holding register’s value. Now the counter counts down until it
overflows, at which time, the flip-flop changes state, the holding register’s value
is reloaded, and counting continues in the up direction. Since the same value is
loaded each time, the total time for a count up and a count down is 313 kHz
divided by 255, and, therefore, the signal frequency remains the same. The duty
cycle changes as the software programs the holding register, thus allowing for a
fully off to a fully on signal.
A-18.7 VALVE PWM CONTROL
This circuit consists of a 10-bit holding register and 10-bit up/down counter,
being clocked at 5MHz. This circuit is used to control the NIBP VSO valve by
generating a pulse width modulated signal which drives the valve. The valve
PWM signal exits on pin 74. The enable for this signal is the VALVE_GO signal
in the CONTROL register.
The software loads a value into the 10-bit holding register. The counter is
clocked by a 5MHz clock. When the counter overflows, the value in the holding
register is loaded into the counter synchronously with the 5MHz clock. The
counter operates as a count up then count down circuit, always generating the
same frequency, but with different duty cycles. Once a value is loaded into the
counter, the counter counts up until it overflows. If VALVE_GO is true, then the
VALVE_PWM_FF is output on pin 74. When the counter overflows, the
VALVE_PWM_FF changes state, and the counter is reloaded with the holding
register’s value. Now the counter counts down until it underflows, at which time,
the flip-flop changes state, the holding register’s value is reloaded, and counting
continues in the up direction. Since the same value is loaded each time, the total
A-39
Appendix - Technical Supplement
time for a count up and a count down is 5mHz divided by 1023, and, therefore,
the signal frequency remains the same. The duty cycle changes as the software
programs the holding register, thus allowing for a fully off to a fully on signal.
A-18.8 TEMPERATURE PROBE HEATER PWM CONTROL
The NPB-3900 has a predictive temperature probe which has a heater at the tip
of the probe. This heater is controlled by software programming a PWM. It
works exactly the same as the VALVE PWM, except it has a 100 kHz clock, and
its output is gated with the 100 kHz clock. The PWM controls the number of 100
kHz pulses put out to the heater.
A-18.9 SPEAKER FREQUENCY GENERATOR
The speaker requires tones from about 300 Hz to 1 kHz with a 55% duty cycle.
In order to give software full control over both the frequency and duty cycle,
there are two software programmable 8-bit up counters, one for generating the
low portion of the TONE_OUT and one for generating the high portion. The
TONE_OUT flip flop is jammed reset when the FREQ_GO bit in the
CONTROL REGISTER is low. This enables the SPEAKER LOW counter. The
software programs the high and low values into the respective holding registers,
then sets the FREQ_GO bit. The TONE_OUT on pin 55 is low, and remains low
until the SPEAKER LOW counter overflows, which sets the TONE_OUT high
and loads the SPEAKER HIGH counter. This counter now increments until it
overflows, which now sets the TONE_OUT signal low and reloads the
SPEAKER LOW counter. This process continues until the software turns off the
TONE_OUT signal by resetting the FREQ_GO bit in the CONTROL
REGISTER.
A-18.10 KNOB DETECT
The rotating knob on the front of the unit has an optical interface. It is supplied
with 5 volts and it and generates two signal channels (A and B) that are input to
the FPGA on pins 93 and 94. When the knob rotates clockwise the square wave
on CHANNEL A leads the square wave on CHANNEL B by 90 degrees. When
rotating counterclockwise, CHANNEL B leads CHANNEL A by 90 degrees.
This circuit exclusively ors the channels and generates an edge each time a
channel input changes state. One flip flop is set on the rising edge and another is
set on the trailing edge. These 2 flops are ored together and exit on pin 62, which
is for debugging purposes only. Thus, the software polls the status register and if
the KNOB INTERRUPT is high in bit 7 of hex address 30A, software reads the
status of the two input channels in bits 4 and 5 of the same register. Software
keeps track of these bits and can determine which one changes first to determine
the direction. It is up to the software to keep up with the knob rotation and in
which direction it is turning.
A-18.11 A/D CONVERTER SELECT CONTROL
The ADCS signal is used to reset and enable the ADC (U207, A/D Converter).
When powering up, the reset signal into the FPGA is ored into the ADCS signal
or gate and goes high, then low when reset goes away. On the high to low
A-40
Appendix - Technical Supplement
transition the ADC resets itself and is ready for a new command. A
programmable bit in the Control register, bit 7, can also be set by software to
perform this function. When the ADC is commanded to take a conversion and
EOC goes low, indicating the ADC is busy, the ADCS signal goes high as
recommended by the vendor to keep noise out of the ADC.
A-18.12 MISCELLANEOUS CIRCUITS
The master clock from the 40MHz oscillator enters the FPGA on two pins, 39
and 75. CLK2_40MHZ is the 40MHz internal clock for the FPGA. A separate
clock is required for the I/O flops, and this is generated as IOCLK from the same
40MHz internal clock coming in on a different pin.
A-41
Appendix - Technical Supplement
(1X)
3
REAR CASE ASSEMBLY
RIBBON CABLE FROM REAR CONNECTOR PCB
9
45
20
GASKET INSTALLED IN CASE GROOVE
FRONT CASE ASSEMBLY
4
CONNECT TO MATING NIBP
FITTING ON MAIN BOARD
(FRONT CASE ASSY)
8
TABS ON HOOD FIT INTO
HOLES IN CONNECTOR PANEL.
NOTE: REMOVE HOOD BEFORE FRONT
AND REAR CASE ARE DISASSEMBLED.
Figure A-29
NPB-3900 Top Assembly Drawing (Sheet 1 of 2)
A-43/A-44 (BLANK)
Appendix - Technical Supplement
44
CONNECT BATTERY CABLE RED WIRE TO + ON BATTERY AND ON
MAIN BOARD (TOP LUG). BLACK WIRE TO - ON BATTERY AND ON
MAIN BOARD (BOTTOM LUG). NOTE: THE END OF THE CABLE WITH
FERRITES GOES TO THE MAIN BOARD.
(4X)
BATTERY COVER (MODELS 3910, 3930)
1
BATTERY COVER (MODELS 3920, 3940)
2
6
(MODELS 3920, 3940)
7
(MODELS 3920, 3940)
FRONT CASE
ASSEMBLY (REF)
24
3
REAR COVER
(SUPPLIED WITH FEET &
REAR COVER GASKET)
REF
SEE SHEET 1
(2X)
(MODELS 3920, 3940)
(MODELS 3920, 3940)
25
(2X)
5
(2X)
DRESS CABLE THRU HOLE IN
BATTERY COVER, OVER LEFT SIDE
OF BATTERY HOUSING AND
CONNECT TO J3 ON CONNECTOR BOARD
Figure A-29
NPB-3900 Top Assembly Drawing (Sheet 2 of 2)
A-45/A-46 (BLANK)
Appendix - Technical Supplement
(4X)
(4X)
12
13
16
SPEAKER CABLE TO BE CONNECTED
TO J4 ON MAIN BOARD
SEE SHEET 2
15
11 FRONT COVER (SUPPLIED WITH
KEYPAD, DISPLAY WINDOW & GASKET)
18
MATES WITH J20
ON MAIN BOARD
(1X)
(1X)
MAIN PCB (3910) 26
SUPPLIED WITH
ITEM 18
(1X)
(2X)
MAIN PCB (3920/3940) 27
MAIN PCB (3930) 28
17
DISPLAY BACKLIGHT CONNECTOR
MATES WITH J303 ON MAIN BOARD
SEE SHEET 2
14
REMOVE PROTECTIVE LINER
FROM ADHESIVE STRIP
NOTE ORIENTATION: NOTCH
MUST BE ON TOP WITH ADHESIVE
STRIP TOWARDS FRONT CASE
19
KEYPAD CABLE FEEDS THRU SLOT
IN FRONT COVER AND MATES TO
J2 ON MAIN BOARD
SEE SHEET 2
Figure A-30
NPB-3900 Front Case Assembly Drawing (Sheet 1 of 2)
A-47/A-48 (BLANK)
Appendix - Technical Supplement
30
TUBING & NIBP PANEL FITTING
JUMPERS JP101 & JP102
CONNECT TUBE TO FITTING
J4 MATES WITH SPEAKER CABLE
FUSE F301
SEE DETAIL A
J20
35
40
MATES WITH BATTERY CABLE.
RED (+) LEAD ON TOP.
(3910)
41
(3920)
42
43
SLOT ON PC BOARD FITS
OVER TAB IN CASE
31
(3930)
(3910)
32
(3940)
(3920)
33
34
(3930)
(3940)
INSTALL SHIELD OVER "D" CONN
BEFORE FASTENING BOARD TO PANEL
(2X)
(1X)
SLOT ON PC BOARD FITS
AROUND PLASTIC BOSS
AND SCREW HOLDS
BOARD TO FRONT CASE
FEED CABLE THRU HOLE
IN BOARD AND CONNECT TO J9
(2X)
30
REF
(SUPPLIED WITH NIBP PNEUMATIC TUBING & FITTINGS)
J2 (FAR SIDE) MATES WITH KEYPAD CABLE
J303 (FAR SIDE) MATES WITH BACKLIGHT CABLE
DETAIL A
Figure A-30
NPB-3900 Front Case Assembly Drawing (Sheet 2 of 2)
A-49/A-50 (BLANK)
Appendix - Technical Supplement
9
(REF)
GASKET INSTALLED IN CASE GROOVE
23
45
(REF)
24
(REF)
20
25
21
(2x) (REF)
Figure A-31
NPB-3900 Rear Case Assembly Drawing
A-51/A-52 (BLANK)
Appendix - Technical Supplement
6
1
4
5
LED assembly is pre-installed
in Front Panel (7)
2
7
8
Printer Assembly
(complete)
Switch
(replacement)
11
10
3
Pins to be pushed
out if door assembly
is to be replaced.
Door
(replacement)
9
Figure A-32
P-3900 Assembly Drawing
A-53/A-54 (BLANK)
Appendix - Technical Supplement
KEYSTONE
ELECTRONICS
4900
SPL301
MAIN
(+)
SYSTEM
AMP
102972-2
(2)
(-)
PCB
41206
JP101
1
MODEL
1
SELECTION
6V,8AH
BATTERY
2
P1.2
2
P1.1
JP102
SPL302
KEYSTONE
ELECTRONICS
4900
3M 929665-01-12-1
ECG
J2
1
RCAL
2
+LED
3
-LED
PCB
4
SP02
41207
ANODE
5
6
BGND
7
8
9
CATHODE
1
2
2
3
3
-5ISO
4
4
5
5
AGND
6
6
LINCATH
7
7
LINCOLL
8
SIG_RET
9
9
10
10
11
11
AC1
12
12
AC2
13
13
14
14
BGND
15
15
BGND
16
16
ANODE
17
17
18
18
BGND
19
19
BGND
20
20
21
21
RCAL
22
22
-LED
23
23
+LED
24
24
HTR_RTN
5
4
PROBE TYPE
6
HEATER
THERMOMETER
SHIELD
HTR_PWR
CATHODE
ECG
3B
2B
1B
3A
1A
LL
2A
J4
LA
RA
ECG CONN
J1
EDAC 392-006-520--201
SHIM 6-18818
6
5
4
3
3
2
2
RCAL_RTN
1
1
J20
1
AGND
AGND
AMP 747150-2
J3
DDAT
DCLK
+5ISO
8
BERG 67118-512
TEMP
PROBE
J8
3
VIA KNOB
4
5
RIBBON CABLE
TO
1
2
TO KNOB
6
GND
GND
PB
TEMP
NIBP
POWER
PUMP
INPUT
PROBE
SWITCH
CHANNEL B
CHANNEL A
+5V
AMP 640456-6 (MALE)
MOLEX
22-12-2024
SWITCHCRAFT
60NC4F
MOLEX
22-12-2024
J5
7
GND
GROUND
8
PUMP+
9
PUMP-
10
TMPSW
11
TMPGND
12
AC2
13
AC2
13
1
2
AC1
15
15
AC1
16
16
3
PWRGND
17
17
4
PWRGND
18
18
PWRGND
19
19
PWRGND
20
2
3
4
5
TO LCD
VIA RIBBON
CABLE
6
7
8
9
1
2
TMPSW
TMPGND
3
4
1
2
CTS
8
PWRGND
RTS
7
NURSE_CALL
DSR
6
9
GROUND
5
10
RESET
4
J2_
ITT CANNON DE9P-F179-K87
DB-9
FLM
LP
CP
M
LCDBIAS
RS232
+5V
GND
LCDBIAS
DISPD0
10
DISP01
11
DISP02
12
DISP03
13
ASSY
SHELL
3428-6002
1
NC
CABLE
41208
14
20
3M
J1
13
TXDATA
JAE IL-G-4P-S3T2-E
PCB
12
RXDATA
HARNESS
CONNECTOR
11
3
BACKLIGHT
9
10
SHELL
J303
TO LED
8
20 PIN CONN
SAMTEC MTLW-108-07-T-S-280
PWRGND
AC2
7
RXDATA
AC1
PWRGND
6
CTS
2
5
6
CHRGLED
TXDATA
STANDBY
8
SWITCH PANEL
4
5
PB4IN
2
7
3
4
20 WIRE RIBBON
CABLE ON
2
3
DSR
NURSE_CALL
1
6
2
RTS
PB3IN
PWRGND
5
VIA RIBBON
1
PB2IN
ALARM/SILENCE
J3
J4_
J1
1
1
4
RESET
PUMP-
3
ON/OFF
PUMP+
2
TO MEMBRANE
SWITCH PANEL
J306
1
20 PIN CONN
J2
J4
1
2
DISPOFF
14
AMP 1-535541-2 (MALE)
MOLEX
TO
SPEAKER
22-11-2022
Figure A-33
NPB-3900 Interconnect Diagram
A-55/A-56 (BLANK)
Appendix - Technical Supplement
74VHCT244
TP232
1
TP254
1
2
18
74VHCT244
J1
1
FLM
LP
1
6
14
LCDCP
U101
475
C139
4
M
5
6
+5V
LCD
TP271
LCDLP
74VHCT244
U101
R127
3
CP
74VHCT244
100PF
U101
LCDM
+5V
7
GND
TP293
1
TP500
1
TP501
1
12
8
DISPD2
12
DISPD3
4
16
11
TP502
1
TP503
1
TP504
1
14
6
74VHCT244
14
LCDD1
74VHCT244
U114
13
DISPOFF
LCDD0
U114
74VHCT244
10
DISPD1
2
18
9
DISPD0
LCDBIAS
74VHCT244
8
LCDBIAS
HEADER
1
4
2
LCDBIAS
DISPLAY
TP263
LCDFLM
U101
16
12
LCDD2
U114
8
LCDD3
74VHCT244
U114
9
11
LCDDISPOFF
U114
R112
10K
74VHCT244
U114
TP121
7
TP284
DRAMOE
BD12
CS3
CS4
BD8
BD9
BD10
BD11
BD0
BD1
BD2
BD3
BD4
BD5
BD6
+3.3V
A1
A2
A3
A4
CS6
TP264
TP185
TP221
TP204
TP138
TP112
1
1
1
1
74LVC541
C119
1000PF
C114
1000PF
C111
1000PF
ALRMSIL
NIBPPB
AUDTONVOL
LCDCONTRST
KNOBPB
KNOBCHB
KNOBCHA
ADCSOUT
74VHCT244
TP329
ADCS
1
7
1
1
1
1
.01UF
LCDD2
IN
LCDD3
ENDTABFR
LCDD1
LCDD0
1
OUT
1
TP146
1
MN13811-J
2
+3.3V
TP145
VR102
COM
100K
TP147
1
TP150
1
TP211
1
TP220
1
TP229
1
88
87
86
30
28
27
29
29
30
28
27
26
26
25
24
25
24
22
21
20
19
23
23
22
21
19
VCC2
18
18
17
16
17
16
15
15
13
12
11
14
14
12
13
11
10
9
8
6
7
5
4
3
2
GND3
82
36
40
41
42
CLKB
43
CLKA
44
42
45
46
46
48
49
81
1
44
47
47
82
TP133
43
45
14V40A
83
TP167
1
48
TP262
1
49
50
IOPCL
11
3
A25
P1.6/HOLD
A24
A23
A22
P1.3/DSR0#
A21
P1.2/DTR0#
A20
P1.1/RTS0#
A19
P1.0/DCD0#
CAS2/A18
CS2/P2.2
A11
CS1/P2.1
A10
CS0/P2.0
A9
P3.7/COMCLK
A7
A8
A4
A3
A2
TMROUT1/P3.1
A1
TMROUT0/P3.0
BHE
BLE
94
95
TO VIA
96
1
D15
INT6/TMRCLK1
D14
INT7/TMRGATE1
D13
TP203
R122
TP219
RESET
89
TP209
1
TP189
PS_100KHZ
D12
92
1
TO VIA
91
1
C116
0.1UF
BUSY#/TMRGATE2
D11
TMRCLK2/PEREQ
D10
D9
TMROUT2/ERROR#
D8
118
112
DREQ
DACK
TO VIA
TP210
117
TP330
128
TP272
113
1
1
1
J204
RXD1/DRQ1
D7
TXD1/DACK1#
D6
D5
DCD1/DRQ0
CS5/DACK0#
D4
CTS1#/EOP#
D3
D2
TP194
1
1
98
77
2
79
TP197
1
78
TP199
3
1
STXCLK/DSR1
D1
D0
SRXCLK/DTR1#
JTAGCLK
RESET
1
25
TP241
JTDTA
1
JTMD
1
26
TP235
119
TO VIA
C118
0.1UF
TP258
1
99
9
+3.3V
15
28
+3.3V
38
47
60
71
R103
STXCLK
81
2.43K
TP202
TP159
1
88
U101
74VHCT244
ADCCLK
5
15
109
121
STXCLK
UCS
ADCTX
TD1
NC
GND4
52
53
54
10K
51
52
54
53
55
55
56
VSV
56
VCC5
60
61
62
59
58
57
59
60
62
61
63
63
64
65
64
66
66
65
VPP
GND5
70
VKS
67
68
69
71
71
70
72
73
72
73
74
IOCLK
75
74
76
78
79
77
76
77
79
78
10K
53
52
51
50
49
48
45
44
43
42
39
37
A5
3
A15
5
A6
6
A16
11
A7
10
A17
14
A8
13
1
TP249
TP170
TP116
TP168
TP297
TP206
TP102
TP233
TP153
TP333
TP151
15
TP296
3
5
6
22
21
20
19
18
16
14
13
12
11
10
8
7
6
5
+3.3V
TP156
1
TP236
TP251
1
1
TP214
TP164
1
D15
D14
2
3
4
1
TP118
1
TP242
TP276
1
TP119
1
TP123
1
PD1
1
GND
PD1
16
ADS
PD1
31
A18
PD1
2
RESETIN
PD1
17
CS6
PD1
32
A19
PD1
3
M/IO
PD1
18
CS3
PD1
33
CLKOUT
TP124
1
TP287
TP290
TP243
1
4
RD
PD1
19
PD1
CS4
34
5
D/C
PD1
20
PD1
RTCWR
RAS
35
1
TP244
DREQ
TP286
1
TP230
PD1
6
WR
PD1
21
RTCDATA
PD1
36
LCAS
PD1
7
LCDADJ
PD1
22
RTCCLK
PD1
37
UCAS
PD1
8
DACK
PD1
23
RTCCE
PD1
38
PS_100KHZ
PD1
9
PUMPON
PD1
24
WRITE
PD1
39
NIBPPWM
PD1
10
BS8
PD1
25
ENDTABFR
PD1
40
LCDCP
PD1
PD1
11
READY
12
LBA
PD1
PD1
26
PD1
EOCIN
27
PD1
WDTOUT
41
1
9
11
12
13
14
15
D5
D4
TP245
1
TP217
1
16
17
18
D3
D2
TP231
1
TP246
1
LCDFLM
42
8
10
D9
D8
D7
D6
TP108
1
PD1
6
7
1
1
PD1
5
D11
D10
TP115
1
1
D13
D12
TP226
1
19
20
21
22
23
D1
D0
TP218
1
TP237
STXCLK
1
24
PD1
13
BHE
PD1
28
DRAMOE
PD1
43
CASADREN
PD1
14
UCS
PD1
29
GND
PD1
44
LCDLP
PD1
15
BLE
PD1
30
RESET
PD1
45
ADCS
U102
G
TD0
CS6
TP180
114
24
1DIR
1OE
1B1
1A1
1B2
1A2
GND1
1B3
1B4
GND8
U109
VCC1
1B5
1B6
GND2
1A3
1A4
VCC4
1A5
1A6
GND7
1B7
1A7
1B8
1A8
2B1
2A1
2B2
2A2
GND3
GND6
2B3
2A3
2B4
2A4
VCC2
2B5
2B6
GND4
VCC3
2A5
2A6
GND5
2B7
A27
2B8
2A8
2DIR
2OE
C138
0.1UF
C129
1000PF
C155
TP238
48
47
46
45
44
43
BD15
BD14
1
BD13
BD12
VSS1
VSS2
VCC2
VCC3
WDTOUT
1
1
TP215
CLKOUT
TP163
VCC5
VSS5
VCC6
VSS6
VCC7
VSS7
VCC8
VSS8
VCC9
VSS9
VCC10
VCC11
127
VSS10
386EX
VSS11
VSS12
+5V
1
9
64
8
83
7
97
100
6
116
130
5
74LVC541
U117
AE
BE
12
10
69
1
13
11
0.1UF
46
19
VCC
U114
4
4
GND
+5V
10
1
2
BD4
BD5
BD6
BD7
TP105
1
2
RTS
2
N.C.
1
TXDATA
C135
1000PF
C1-
C2+
V+
C2-
C1+
V-
VCC
R5IN
GND
R5OUT
R1IN
T3IN
T4IN
R1OUT
T1IN
R4OUT
T2IN
R4IN
R2OUT
EN
R2IN
SHDN
T2OUT
R3OUT
T1OUT
R3IN
T3OUT
T4OUT
9
I/O14
I/O13
I/O3
I/O12
VCC2
42
41
40
VSS2
I/O4
I/O11
I/O5
I/O10
44
43
37
I/O6
I/O9
I/O7
I/O8
BD15
BD14
BD13
BD12
39
38
1
RN101
14
3
13
36
35
TP110
14
1
33
Y
VCC
U102
GND
TP104
12
1
RN101
13
16
4
WRITE
RAS
TP103
1
33
15
16
17
18
+3.3V
19
8
20
C104
0.1UF
21
22
NC1
NC4
NC2
LCAS
WE
UCAS
RAS
OE
NC3
A8
A0
A7
A1
A6
A2
A5
A3
A4
VCC3
VSS3
32
BD11
BD10
BD9
BD8
31
30
29
28
TP266
1
LCAS
UCAS
DRAMOE
27
26
25
24
23
B
U106
Y
4
TP161
7
TP149
1
B
U106
Y
1
U106
Y
9
TP247
12
TP234
1
U106
A/B
G
6
1
TP269
1
RN101
10
7
TP274
1
33
A
B
TP265
5
RN101
11
33
A
B
RN101
12
33
A
Y
VCC
U106
GND
1
RN101
9
8
TP275
1
33
16
+3.3V
8
C113
0.1UF
A
B
U108
Y
BD11
BD10
1
4
TP216
B
U108
Y
B
U108
Y
TP224
1
33.2
R129
7
TP240
1
TP109
A
R126
1
A
DRAM-A9
1
33.2
NOT USED (FUTURE)
9
+3.3V
A
B
U108
Y
12
16
A/B
VCC
U108
G
TP152
C115
0.1UF
8
GND
VHC157
TP100
TP294
TP101
41
40
1
TP298
TP288
1
39
BD9
BD8
BD7
BD6
38
37
36
35
TP282
1
TP279
1
TP187
1
TP278
1
34
BD5
BD4
33
32
TP177
1
TP176
1
31
BD3
BD2
30
29
TP175
1
TP174
1
28
BD1
BD0
27
26
TP273
1
TP172
1
25
C152
0.1UF
15
1
1
17
TP225
1
18
19
21
22
23
74LVC541
RXDATA
TP248
1
1
TP193
9
11
BD4
BD5
BD6
BD7
74LVC541
NSCALL
TP255
1
TP173
7
13
26
27
7
8
10
24
CS4
25
6
9
1
U117
DSR
5
11
D4
CTS*
D5
RESE
D6
DTR
U124
D7
RTS
ST16C1550J28
RX
A0
(UART)
TX
A1
CS*
A2
23
C132
C162
1000PF
0.1UF
RESET
22
21
20
19
BLE
A1
A2
+3.3V
74LVC541
TP171
TP260
1
5
1
U117
CTS
28
15
R131
10K
1
1
4
16
16
17
48
1
2
3
4
5
6
7
8
18
19
20
21
22
23
24
25
15
FLASHBSY
1
NURSECALL
11
A19
A18
A17
A16
A15
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
25
24
26
OE
2
12
CE
JP104
RST
WE
1
U117
TP222
28
UCS
+3.3V
1
16
20
WR
TP154
BD0
BD1
BD2
BD3
1
U119
74VHC240
U112
N.C.
10K
8
10
I/O15
I/O1
I/O2
TP295
18
C131
0.1UF
R125
3
DTR
74LVC541
U117
20
74VHCT244
U117
TP207
0.1UF
C151
16
17
14
RSGND
36
N.C.
74LVC541
RN101
15
VSS1
I/O0
42
0.1UF
1
0.1UF
C156
R111
10K
3
17
31
MAX211E
TP200
C153
JTOUT
1
VSS3
VSS4
1
7
VCC1
1
RD
TP191
FLT
VCC1
VCC4
9
TP285
A
15
1
1K
+3.3V
UCS
1
TRST
TP188
5
6
TP106
1
U111
1
103
Y
U102
1
R116
1
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
23
ENDTABFR
74LVC16245
1
7
VHC157
2
13
WR
C196
56PF
TP117
1
BLE
1
CLK10MHZ
TP157
1
BHE
1
R135
10K
R158
10K
1
1
Y
A
B
1
4
33
A/B
TP268
14
1
17
3
R123
NIBPPWM
TMS
TP280
ADCRX
54
FETX
3
+5V
56
55
R149
33.2
TP114
TP259
U101
1
1
57
2
WDTOUT
TCK
VCC12
74VHCT244
R119
2
10
ADDRESS BUS
TP253
1
B
RN101
16
33
U102
A
SSIOTX/RTS1#
SSIORX/RI1#
REFRESH#/CS6
76
TP186
58
INT4/TMRCLK0
INT5/TMRGATE0
RTCCLK
9
A14
TP136
TP169
10
TP113
1
1
3
U113
1
1
1
93
1K
A5
INT2/P3.4
P3.2/INT0
1
1K
1
R148
P3.5/INT3
INT1/P3.3
TP212
62
B
TP198
VHC157
11
2
1
R147
TO VIA
1K
74
TP126
SPKR_ADJ_PLS
C198
0.1UF
75
A20
A19
A18
A17
A16
A15
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
63
4
RTCDATA
8
26
80
TP141
TP223
1
11
Y
A
TP155
A9
CD*
82
TP179
1
15
1
DSR*
84
TP281
1
1
TMROUT1
A6
1
A19
RI
85
TP227
1
UARTINT
NPANPWR
PROBEST
ERLYWRN
P3.6/PWRDOWN
VDD
N.C.
N.C.
13
R109
INT
1
FCE
14
1K
CLK
WR
10
A4
U102
A18
A17
DQ15
A16
DQ13
DQ14
A15
DQ12
A14
DQ11
A13
DQ10
A12
DQ9
A11
DQ8
A10
DQ7
A9
DQ6
A8
DQ5
DQ4
A7
DQ3
A6
A5
DQ2
A4
DQ1
A3
DQ0
45
43
41
39
36
34
32
30
44
42
40
38
35
33
31
29
BD15
BD14
BD13
BD12
BD11
BD10
BD9
BD8
BD7
BD6
BD5
BD4
BD3
BD2
BD1
BD0
+3.3V
47
3
RESET
A2
A1
A0
VCC
37
+3.3V
18
(TIE TO GND
AT J306 PIN 12)
86
TP192
RTCCE
PSOFF
DATA
A3
A13
B
12
RTC-4543SA
TP139
87
NPPVEN3
TMPGND
FSEL
6
11
13
UARTINT
122
A14
A12
N.C.
RESET
3
123
TP335
1
A15
A13
N.C.
CE
14
A2
A12
TP111
27
TP336
1
CAS0/A16
0.1UF
1K
VCC
1
P2.7/CTS0#
TXD0/P2.6
CS3/P2.3
C126
5
A10
59
CS4/P2.4
N.C.
5
A11
6
66
65
61
RXD0/P2.5
FOUT
3
A18
IOR
R105
1K
C103
0.1UF
124
GND
A1
A
2
U112
17
126
125
TP337
1
67
BD0
BD1
BD2
BD3
17
3
RD
129
TP148
7
2
1
4
3910
1
SET
A10
74VHC240
1
28
3920
ON
131
TP228
1
CS4
CS3
RTCWR
RTCDATA
RTCCLK
1
1
D0
ON
ON
1
SP02TX
SP02RX
1
1
D1
OPEN
SPKRU/D
1
1
D2
3930
68
1
D3
3940
OPEN
1
1
GND
MODEL
OPEN
ON
70
10K
XTAL2
JP101
OPEN
C101
0.1
72
10K
IOW
JP102
10k
BACKLITE_OFF
XTAL1
R104
TMPSW
1
WR
1
1
CASADREN
SPKRFREQ
BLE
CLTS
KNOBINT
P1.7/HLDA
P1.5/LOCK#
P1.4/RIO#
CAS1/A17
132
TP125
JP103
2
GND
OFF
74VHCT244
U101
16
101
1
LBA
GND
GND
1
TP134
TP292
15
102
TP183
FLASHBSY
JP102
RD
1
7
R115
14
105
104
1
TP165
6
R113
13
106
TP261
TP267
RTCWR
12
107
TP182
1
4
5
WR
2
108
TP252
1
1
CHRGST
34
35
120
1
R114
1
M/IO
4
TP205
1
111
TP140
1
DCST
2
WR
D/C
3
CLK10MHZ
2
RD
LBA
W/R
1
1
SMI
SMIACT
LCDCTRL
LCDADJ
JP120
1
1
U107
TP166
PS_100KHZ
DACK
DREQ
HTR_100KHZ
FE_100KHZ
+3.3V
10K
JP101
+3.3V
READY
NMI
TP160
NSCALL
73
1
TP158
27
READY
10K
R142
10K
30
29
TP195
90
TP196
1
R108
M/IO
STXCLK
LCDCP
FE_100KHZ
LCDM
TP283
1
R107
W/R
D/C
BS8
TP181
32
READY
1K
+3.3V
CLK2
NA
R101
1.2M
TP277
1
ADS
CLK2
33
TP250
BS8
1
TP144
41
TP143
1
R110
TP256
TP270
10k
40
TP331
2
Q101
3
115
CLK2
1
1
ADS
RESET
TP201
1
TP127
STNDBY
110
RESET
LCDFLM
LCDLP
RAS
LCAS
R102
80
80
+3.3V
2N3906
2
RTCCE
9
1
R106
GND
8
U120
D/C
CLK2
M/IO
RD
WR
BD14
BHE
BD15
WDTOUT
RESET
UCAS
39
41
OUT
MAX604
1
38
40
VCC6
4
37
38
ACT100QF
TP162
1
35
HCLK
U105
VCC7
84
83
34
VCC4
GND6
85
84
81
TMROUT1
VCC3
95
86
85
33
33
PRB
96
PRA
89
3
IN
BD13
ADS
W/R
UCS
+3.3V
32
32
97
93
92
90
WDT_PULSE
2
0.1UF
94
93
TP239
U103
1
C122
31
31
99
96
1
TP257
CASADREN
VBATT1
98
97
91
R134
100K
99
95
+3.3V
C100
TP131
HM51S4260ATT
TP289
74LVC541
1
DCLK
98
TP107
TP122
13
+3.3V
R128
TP299
100
94
U101
1K
EOC
1
1000PF
0.1UF
BY
GND1
BYTE
GND2
AMD29LV400
27
46
C143
C133
0.1UF
1000PF
TP190
C120
1000PF
1
10
C191
.01UF
VCC1
C190
.01UF
GND2
C189
.01UF
+5V
MODE
6
6
1
2
J8
4
1
J8
5
J8
GND1
CONN
1
1
C141
6
5
3
KNOB
1
SDI
J8
R124
10K
C134
+3.3V
U117
14
EOCIN
TP213
4
R117
2.43K
TP120
3
J8
R118
2.43K
WRITE
R152
10K
R120
2.43K
TP334
1
13
+3.3V
J8
PUMPON
1
BD7
PUMPPWM
TP178
1
74VHC240
1
+3.3V
N.C.
20
AE
19
BE
+5V
VCC
U101
GND
10
74VHCT244
R145
CLK2
1
33.2
R121
TP338
TP291
1
2
18
U112
N.C.
8
12
TP208
4
ST
VDD
3
1
C121
0.1UF
C127
1000PF
74VHC240
N.C.
1
2
OUT
33.2
C107
CLTS
U112
C102
1000PF
X103
1
1
VSS
1
6
74VHC240
R130
10K
TP142
74VHC240
TP184
U112
14
20
AE
U112
19
BE
SG-636SCM
+3.3V
VCC
10
U112
11
9
+3.3V
GND
74VHC240
74VHC240
C130
0.1UF
56PF
C136
1000PF
U112
N.C.
13
7
C108
0.1UF
C109
1000PF
C112
0.1UF
C117
1000PF
C105
0.1UF
C110
0.1UF
C124
1000PF
C125
0.1UF
C128
1000PF
74VHC240
N.C.
1
20
G1
19
C106
56PF
10
74LVC541
U112
5
+3.3V
VCC
U117
G2
15
NOTE: C108,C109,C112 AND C117 ARE DECOUPLING CAPS FOR U105
GND
C105,C110,C124 AND C125 ARE DECOUPLING CAPS FOR U107
74VHCT244
U114
C137
0.1UF
N.C.
3
17
Figure A-34
Main PCB Schematic Diagram (Sheet 1 of 5)
A-57/A-58 (BLANK)
Appendix - Technical Supplement
+5VREG
R208
+5VREG
3.92K
+5VREG
VBATT
R257
3
4
NC
VCC
665K
PS201
R263
100K
5
1%
Q205
R254
NPANPWR
3
1
2
3
1
1
(P1.1)
20K
1%
2
TP373
VBATT
3
VD
+
U210
CTRL
C1
VOUT
12
TP367
+
1
332K
-
R259
GND
LMC660
R255
1
U216
2
C233
0.1UF
1
6
6
5
4
VIN
GND
+5VREG
2N4401
C230
.47UF
C203
680PF
8
TP327
1
OSC
1
33.2K
R269
R262
562K
R256
562K
R249
TP332
U216
C293
0.1UF
30.1K
R272
R219
10K
1%
10UF
C239
+
9
-
0.1UF
1
C249
10
1.0UF
-
C234
TP368
LMC660
C240
14
U216
13
665K
DMS873
TK11450
R266
806K
LMC660
C235
2
NC
1.0UF
TP359
1
0.1UF
R218
68.1K
1%
+5VREG
TP342
TP387
R286
1
28K
1
243K
NIBPRSR1
R295
20K
R276
20K
+5VREG
C232
.01UF
R288
20K
+5VREG
+5VREG
R273
3.92K
Plug In
Patient Connector
Isolation Barrier
4
NC
VCC
PS202
VBATT2
R252
562K
3
Q211
6
3
R261
Board
SI9928DY
NC
VD
5
C1
GND
1
R253
+
C231
.47UF
C267
680PF
R268
1
2
2N4401
10UF
35V
TP370
1
12
TP357
8
1
NPPVEN3
1%
U117
(P3.7)
NPPVEN
NIBPRSR2
R200
2.43K
8
VCC
7
VE
6
OUT
NC
1
7
NIBPPWM
15
BAT54C
5
2
1
3
1
1
2
TP326
1
D202
NC
4
R204
NC
1
SI9928DY
Q211
TP312
U114
2 +5V
5
8
10K
74VHCT244
68.1K
1%
3
R201
2.43K
R209
C228
.01UF
R216
U200
Normally Open
Proportional Valve
74LVC541
C246
R217
10K
3
1
100K
1%
-
1
23-Ohm
TP364
1
Q206
TP363
R265
U216
6
TP356
7
68.1K
R264
68.1K
V201
1N4001
100K
1%
LMC660
5
SPARK
GAP
D205
1
DMS873
SG201
4
TP388
R277
100K
1%
C248
0.1UF
6
5
182K
2
ADCTX
1.50K
GND
CNW139
U201
R202
2.43K
8
VCC
7
VE
6
OUT
ADCS
ADCRX
2 +5V
ADCTX
ADCCLK
R205
3
R203
5
2.43K
NC
4
CNW139
20
VCC
19
OPTOCOUPLERS
18
C200
3
+5ISO
4
-5ISO
5
AGND
6
AGND
7
LINCATH
CLARE
1000PF
100V
IL-300
1
8
9
U202
2
7
11
AGND
12
HAC1
13
HAC2
14
HTR_PWR
16
.733-.805
.769-.855
15
.806-.886
.855-.950
14
.886-.994
.950-1.056
13
G
.975-1.072
301
1%
3
6
4
5
2
3
-
TP317
AIN2
CS
AIN5
REF+
AIN6
REF-
AIN7
AIN10
AIN8
AIN9
GND
R234
NIBPRSR2
4
STNDBY
R251
TP303
C205
1000PF
1TP307
7
6
C201
5
1%
+5VREG
R232
10K
33.2
1%
PUMP+
5%
D203
ALRMSIL
ALARM_SILENCE
D201
CONN VIA TO GND
AT PIN 10
MURS120T3
MURS120T3
TP300
TP396
1
C241
AGND
+5V
16
17
10UF
L200
18
25V
8
C215
7
19
BEAD
20
10
21
C225
T201
6
0.1UF
C220
1
TP314
1000PF
5
TP323
U204
VS
VS
OUT
IN
OUT
NC
GND
GND
6
8
3
L201
24
7
TP301
6
BEAD
C209
TP313
1000PF
R225
5
33.2
VS
OUT
IN
OUT
NC
GND
GND
C216
BEAD
FE_100KHZ
TP308
2
2
C210
1
0.1UF
3
+3.3V
R246
R213
GND
J2
PB2IN
1TP315
4
J2
PB3IN
J2
PB4IN
33.2
C222
C223
.01UF
1K
1
+5V
3
C221
1000PF
AUDTONVOL
R230
1000PF
+3.3V
D200
TP306
1TP310
C227
.01UF
R214
100K
1%
1%
1%
+4REF
ALARM_SI
100K
R245
100K
4
J2
33.2
PUMPPWM
TP321
1
2
C208
1000PF
1
Q210
TP319
C212
R211
TP302
NIBPPB
L205
+5AD
1TP309
C229
.01UF
R212
100K
1%
TP328
SI9928DY
MIC4452
TP304
1%
7
25V
VS
+3.3V
2N4401
8
22UF
U205
23
NPPVEN
1%
4
R210
33.2
R247
10K
10K
3
MIC4452
8
1000PF
2
R242
FE_100KHZ
TP311
2
Q200
1
10%
1%
10K
1
3
0.01UF
PUMP-
R231
+5V
C214
J2
1000PF
1%
R244
1%
10K
TLC2543
1
C207
0.1UF
R248
10k
R233
VOUT
ON/OFF
SI9928DY
R235
49.9K
TP324
9
+3.3V
Q210
+3.3V
8
10
7
301
4
1%
VBATTAD
AT J20 PIN 9
TP316
1TP325
J2
3
49.9K
OSC
TP305
6
15
LM4040-4.1
10UF
C206
1000PF
10
T202
L202
1
TP318
BEAD
8
6
3
0.1UF
25V
8
7
6
C211
R227
C213
1000PF
5
33.2
2
22
C204
1000PF
1%
NIBPRSR1
3
5
6
J2
2
AIN3
AIN4
1TP322
1K
+
AD_RTN
CONN TO AGND
AIN1
I/OCLK
DATA/OUT
11
1
U203
EOC
DATA/IN
12
1.056-1.175
TLC2262C
SIG_RTN
AGND
IL300-DEFG-X1X6
F
E
1%
80.6K
8
BIN#
R206
LINCOLL
10
D
R207
17
SIEMENS
LOC-111EV-X1
R250
100K
10%
U206
VS
VS
OUT
IN
OUT
NC
GND
GND
1
R221
100K
1%
C219
0.1UF
HTR_100KHZ
2
R224
1TP320
LCDCONTRST
3
5
33.2
4
C202
.01UF
MIC4452
C224
1000PF
8
J2
+3.3V
U208
1
+5ISO
R237
NC
VCC
2
1.50K
JX2
JX1
AGND
AGND
ANODE
CATHODE
AGND
AGND
RCAL_RTN
RCAL
-LED
+LED
3
8
2
L203
-5ISOSP
4
-5ISO
6
TP345
4
R241
GND PROBE POINTS (THRU-HOLE)
V+
C236
2.43K
GND
TX
TP355
+5VREG
SP02RX
5
NC
BEAD
0.1UF
CNW139
9
4
8
7
OUT
1.50K
V-
1
2
4
1
5
VE
3
R236
3
1
7
8
10
SPO2
L204
C218
C217
0.1UF
0.1UF
U209
R238
2.43K
5
9
+3.3V
13
3
7
+5ISO
BEAD
2
6
+5AD
+5ISO
6
10
11
RX
+5ISOSP
11
CTS
8
VCC
7
VE
6
OUT
8
NC
R239
14
2.43K
AGND
TLC2262C
2
6
3
12
V+
1
5
NC
4
SP02TX
R240
1K
5
1%
U203
+
U203
V-
7
TLC2262C
DCLK
1
AIN0
R243
PWRUP
U216
DDAT
2
U207
1%
0.01UF
LMC660
1
CHRGLED
R215
1.0K
C226
J20
VBATT1
EOC
ADCCLK
1.50K
GND
C242
0.1UF
4
GND
GND
CNW139
AD_RTN
See sheets 4 & 5
Figure A-34
Main PCB Schematic Diagram (Sheet 2 of 5)
A-59/A-60 (BLANK)
Appendix - Technical Supplement
POWER ON/OFF
C308
0.1UF
D304
BAV70
VBATT1
F303
2
1
F302
2
P1
3
TP441
U301
VBATT1
1%
100K
CLK
SET
Q
1
Q
2
R305
1
4A
C317
1000PF
10%
10%
10%
2
P1
VCC
Q13
Q10
Q14
Q8
Q6
Q9
Q5
6
7
8
PI
Q4
P0
1
VBATT1
Q
2
CLR
TP450
13
VCC
GND
8 CD4013
4049
VSS
4071
7
10
10
3
1
TP463
C350
47UF
0.1UF
10%
10%
4
1
C306
V+
GND
CC
OUT
L301
TP438
7
LX
SS
0.047UF
10%
10%
1%
10
4049
ALARM_SILENCE
6
1
10K
7
1%
D312
10%
C345
MBRS340T3
C356
10K
47UF
1%
10%
10%
1
R318
1.00K
VBATT1
1%
1%
10K
4
ALARM
7
6
1
3
4
U302
TP470
TP445
8
VCC
1
DISCH
1
4071
NE555
TP498
R319
Q301
U314
RESET
1
5
21.5K
2
1%
6
2
TP400
3
OUT
5
3
1
ALARM
TRIG
4
THRESH
CONT
GND
1
C341
22UF
0.1UF
10%
LCDCTRL
3
4
CTRL
DLO
FB
GND
25v
10%
Q307
TP466
1
6
TP430
5
1%
475
MURS120T3
D313
R338
1
RTS
3
4
TXDATA
5
6
RXDATA
7
8
25V
GND
2
TP495
3
D307
1
C303
2
U310
NURSECALL
SPKRU/D
1
DSR
2
CTS
3
RSGND
SPKR_ADJ_PLS
PUMP-
9
10
PUMP+
11
12
TMPGND
5
AC2
13
14
AC2
6
AC1
15
16
AC1
7
17
18
GND
8
19
20
NC1
NC7
NC2
VB
INC
VW
NC3
VH
CS
NC6
NC4
NC5
GND
0.1UF
16
1%
33.2K
10%
2
15
14
TP417
3
R322
TP494
C315
4
13
1
12
1
0.1UF
10%
GND
BP
GND
IN+
VDD
IN-
VO1
8
1
7
J4
SPKR
6
5
2
J4
LM4862
11
TP496
BOOMER
1
10
9
VL
0.1UF
10%
GND
25V
10%
10%
GND
5V REG
VO2
1%
33.2K
DS1666S-10
10UF
100PF
SD
C344
47UHY
20%
U313
1
L309
5%
1.2M
VBATT
2 PIN
HEADER
1
VCC
1%
33.2K
R321
C318
1
R336
U/D
1
10%
TP401
C314
R320
TP402
0.1UF
10%
TMPSW
GND
TP465
C343
C313
TP418
4
GND
LCDBIAS
J306
DTR
1
1
TP467
MAX749
C312
10%
+5V
2
7
5
1
FZT951CT
8
CS
6
0.1UF
1
DHI
7
10%
0.1UF
ADJ
SET
C311
GND
3
V+
OFF
8
0.01UF
2N4401
SPKRFREQ
2
GND
C310
1
1
GND
GND
10%
TP468
U307
OUT
GND
10UF
TP499
R337
5%
U315
IN
MAX603
1
1
1
16v
16v
1
11
U302
4049
R310
BAT54C
C342
1
13
12
PWRRST
TP497
U301
6
TP419
2
TP425
LCDADJ
CD4013
SPEAKER
3
1%
22UHY
20%
1
0.33
ALARM
TP443
1
Q302
5
LCD BIAS
TP446
15
14
U301
GND
+3.3V
12
TP449
1%
R351
1000PF
100K
8
TP404
R309
GND
2
TP444
+3.3V
100UF
330PF
13
Q
500Hz oscillator =
1%
R350
8
C346
TP464
25V
10K
1
C347
10%
10%
MAX763A
C348
10UF
1%
1
10%
Q
CLR
GND
49.9k
0.1UF
7
1
REF
16v
U302
C307
10K
R306
U306
TP462
C349
R314
CLK
1
PSOFF
SHDN
11
R317
9
1
ERLYWRN
R307
2
C353
100K
1
SET
D
4071
VBATT
1
2N4401
about 15 second delay
VBATT1
3.3V REG
1
2
8
9
U304
BAV70
D305
TP454
U301
TP452
GND
R308
1
TP423
3
TP461
1
1
1
U301
1
1%
12
11
1
2
1.00K
TP455
10
3
TP442
R315
100K
2N3906
PWRUP
1000PF
10%
4071
TP451
9
P0
TP459
C309
WDT_PULSE
1%
49.9K
R311
4049
9
Q300
PWRUP
1
1
11
0.01UF
GND
7 CD4013
12
1%
562K
R312
12
GND
VBATT1
1
4049
1
1
4060
during original
14
VDD
VSS
4
14
VCC
U304
CD4013
14
VDD
U304
1
U302
CLK
1
Q
U303
3
SET
U301
D
Q
2
PWRUP
TP448
14
1%
6
5
13
CD4013
10
TP403
1
battery connection.
25v
CLK
15
R
Q7
GND
TP422
16
Positive Pulse
10%
VBATT1
Q12
U301
10UF
1
SPADELUG
5
PWRRST
4
5
C305
GND
4
3
1
4049
TP460
16v
2
TP429
1
2
BAV70
1%
1
SPL302
3
D310
ALARM
100K
D301
47UF
2
BATTERY
R304
BAV70
C301
C316
0.1UF
1
SPL301
BAT1
6V,4AH
100K
1%
Q
CLR
2
1%
100K
11
U305
1
CD4013
4
SET
D
U303
TP447
1
CLR
4071
GND
9
ON
U303
3
U302
2
1
VBATT
1
3
1
R303
2
1
D
R316
D306
8
1%
GND
3
1
4049
TP420
1%
1.00K
5
BAV70
1
R313
100K
10%
3
TP458
0 = OFF Request
6
1
1000PF
R301
ON/OFF
1
1 = ON
1
TP456
C304
1
VBATT1
1
2
3
1%
10%
F301
2
TP457
100K
1.1A
SPADELUG
3
TP453
R302
C302
0.1UF
POLYSWITCH
TP486
BAV70
2
GND
VBATT2
1
1.1A
ON
10%
1
D309
2
POLYSWITCH
C319
C320
1000PF
1000PF
C321
C322
C323
1000PF
1000PF
1000PF
C324
C325
1000PF
C326
1000PF
C327
1000PF
C328
1000PF
1000PF
IRF7204
R335
BACKLITE
TP488
1
5%
0.1
GND
2, 3
S
4
G
2
TP424
PWRUP
3
4
1
1
C337
0.1UF
C338
OUT
7
EXT
SHDN
CS
REF
V+
Q308
475
5 , 6, 8, 7
L308
TP439
25V
1
1
7.5V
MBRS340T3
3
1
R343
BACKLITE_OFF
TP408
2
16V
0.1UF
1
10%
1
TP471
1
1.00K
1%
2
3
Q304
2, 4
TP428
C352
1
Q305
1
825
2, 4
Q306
1%
TP405
3
1
6.8UHY
4
CTX210657
1
GND
20%
PRI1
10%
3
1K
AC1
4
9
3
0.22UF
1%
2N4401
L307
1
SEC2
PRICT
R344
R300
CHARGER
TP427
J303
TP493
1
1
GND
1
20%
15PF
B1
2
2N3906
Q303
TP426
10%
C351
SEC1
PRI2
C340
100UF
D314
C339
T303
J303
1
22UF
B2
7
TP490
ZDIODE
68UHY
20%
MAX1626
TP487
5
1
1
5
1
150UHY
TP492
1%
D308
+5V
TP489
6
10%
10%
TP491
20%
D
8
GND
5/3
L310
+5V
R323
U308
1
TP440
1
RS403LR
1
1
C332
D315
0.1UF
2
0.22UF
3
D318
2
10%
BAV70
3
10%
TP421
5
1
6
3
R354
10
TP416
1
C336
10UF
10%
GND
35V
7
D316
8
10K
VCC2
BST
VCC1
GND
PROG
OVP
10K
1%
BAT
GND
GND
GND
GND
14
C333
C334
6.8UF
6.8UF
10%
0.1UF
10%
10%
50V
10%
50V
50V
C335
20%
2N3906
TP410
13
12
1
R329
9
TP409
1
D317
4.64K
1
1
1%
TP414
TP406
R328
10K
TP412
S3
R352
R326
TP407
1%
CHRGLED
1
Q310
R331
4.99K
33UHY
3
1UF
10%
25V
C331
0.1UF
TP480
2
1%
C330
10
S2
1
10K
11
L306
1
C355
3300UF
S1
VBATT
15
10%
Q309
1
1
TP413
R333
VC
SNS
16
LT1510
2
2
1%
GND
SW
3
R334
AC2
Input
BAV70
U309
GND
2N4401
1%
Transformer
4
1
1
4
3
1
C354
2
TP411
C329
S5
CHRGST
FOR SHIELD
16V
S6
R332
R330
1.00K
301
2.49K
R327
R353
1%
1%
1%
100K
S7
1%
MBRS340T3
AVAILABLE
PIN LOCATIONS
1%
47UF
10%
1
1%
S4
100K
GND
GND
S8
TP415
GND
1
Figure A-34
Main PCB Schematic Diagram (Sheet 3 of 5)
A-61/A-62 (BLANK)
Appendix - Technical Supplement
TP34
TP11
TP31
SHT5
TP38
AD7
TP39
AD6
AD5
TP41
AD4
AD3
AD2
AD1
A7
TP78
A6
TP79
A5
TP80
A4
TP81
A3
TP82
A2
TP83
A1
TP84
A15
TP88
TP36
A14
TP89
TP40
A13
TP90
TP45
A12
TP91
TP46
A11
TP92
TP47
A10
TP93
TP48
A9
TP49
TP86
TP74
AD0
TP73
A0
TP85
A8
TP64
TP87
TP67
SHT5
TP18
SHT5
TP12
TP43
TP19
SHT5
TP20
SHT5
TP14
SHT5
SHT5
TP8
TP32
TP33
TP35
TP42
TP44
TP10
TP37
TP13
TP65
SHT5
SHT5
SHT5
SHT5
SHT5
SHT5
SHT5
SHT5
SHT5
SHT5
SHT5
SHT5
SHT5
SHT5
SHT5
TP58
TP60
SHT5
TP61
TP62
SHT5
TP63
TP52
TP21
TP23
TP25
TP27
TP29
TP22
TP24
TP26
TP28
TP30
Figure A-34
Main PCB Schematic Diagram (Sheet 4 of 5)
A-63/A-64 (BLANK)
Appendix - Technical Supplement
TP16
TP15
TP17
TP1
TP50
TP53
TP55
TP5
TP56
SHT4
SHT4
TP66
SHT4
TP7
SHT4
TP59
TP57
SHT4
SHT4
SHT4
TP54
TP94
SHT4
SHT4
SHT4
SHT4
SHT4
TP51
TP77
SHT4
SHT4
SHT4
TP3
SHT4
SHT4
SHT4
SHT4
SHT4
SHT4
TP69
TP70
TP72
TP71
TP76
TP75
SHT4
SHT4
TP4
TP68
TP9
TP2
SHT4
TP6
SHT4
Figure A-34
Main PCB Schematic Diagram (Sheet 5 of 5)
A-65/A-66 (BLANK)
Appendix - Technical Supplement
+5ISO
TP33
1
D24
120PF
1
1SMB75C
1
LSEL2
9
J4
4
NC
A
VEE
B
VSS
INH
VDD
1
16
TP60
1
2
10K
C142
2
2 0.01UF
R227
-
7
1
U75 B
10K
1
+
ECGRES
11
0.5HZ
10
6
9
PARCHK
5
6
TP28
11
NC
1
5
2
4
2
75K
1
100K
1
R2
2
+V2.5
I/3X
OIY
R241
TP65
VDD
B
VSS
C
VEE
2 0.047UF
14
AX/AY
2
-
2
2
TP75
1
TP42
15
BX/BY
-V2.5
R4
2
1
4
CX/CY
1
2
R206
100K
100K
1%
1%
U82
1
UNUSED
+5ISO
PARSIG
CY
U66
C7-C110
16
VCC
C121
C111
0.1UF
8
GND
C125-C126
C129-C135
TP32
14
13
1
1
11
+5ISO
QA
G
QB
QC
SCK
QD
MAXA
1
MAXB
9
TP36
MAXC
10
LSEL1
11
LSEL2
12
0.5HZ
13
1
3
TP13
1
4
TP17
1
5
TP37
1
6
ECGRES
TP38
1
7
PARITY
9
QH
8
TP35
1
2
QF
RCK
1
15
QE
12
2
1.00MEG
SER
SCLR
QH
1
2
4
1TP40
FRONT VIEW
A
U65
C137-C138
B
C
EVEN
5
C141
TP26
D
E
ODD
F
G
VCC
H
GND
1
6
C151
14
+5ISO
7
I
0.1UF
.05%
C167
1
R190
1K
R22
1
1
R12
12
2
16
+5ISO
R23
1K
TEMP2
1
LEG
5
1
I/O0
O/I
TP70
I/O5
I/O6
+
5
R30
R166
I/O7
100K
100K
1%
1%
2
2
B
R3
Q
13
Q
4
R25
R29
1
TP73
R31-R99
R
7
6
C112
LMC662
120PF
1
40.2K
2
6
LINCATH
7
R191-R205
LINCOLL
8
R207-R211
-
2
1%
+5.5ISO
1
1
TL032C
1
R21
-
1
BAW56
U72
B
1
C123
2
7
GND
R220-R222
AC1
12
BAT54C
2
R224-R226
AC2
13
HTR_PWR
14
GND
SET
20V
TP7
5
1
MAX603
10V
C127
22UF
6
C122
22UF
2
20V
2
2
AD706J
OFF
470UF
0.1UF
16V
U5
GND
4
C3
8
OUT
GND
3
1
C120
10UF
TEMP2
IN
2
+5ISO
2
40.2K
7
+
3
1
D3
2
6
D11
TP6
R15
499
1
1
-5.5ISO
1%
1
3
D4
BAW56
1
3
2
2
C176
C124
10UF
0.1UF
3
C5
470UF
4
10V
1
1
16V
1
1%
1
1%
2
2
2
2
-5ISO
R17
1
VO2
SEN
SHDN
VIN
U6
BAT54A
R235-R236
BGND
16
R242-R244
ANODE
17
CATHODE
18
BGND
19
BGND
20
RCAL_RTN
21
RCAL
22
-LED
23
R256-R264
+LED
24
R267-R277
6
VST
R248
R250
R253
R288-R290
5
SHDN
R246
R286
7
VO1
TP20-TP21
MAX664
U7-U9
TPROBE
1
TP12
15
R279-R283
2
8
GND
R228-R233
BGND
D10
2
1
1
1%
1
R28
TP16
10K
R213-R216
11
2
10PPM
-V2.5
1
U10
1
TP11
10
R179-R189
HTR_RTN
1
3
.05%
1
1
.05%
1
5
100K
R176-R177
5
499
1
2
30.1K
2
10PPM
200K
R167-R174
4
AGND
R27
TP15
1%
R13
R16
3
-5ISO
AGND
2
1
R24
1
1
+
2
R218
1%
+5ISO
R144-R165
AGND
9
3
30.1K
2
1
10K
2
SIG_RET
1
TP31
R14
1
DCLK
1
49.9K
R101-R142
DDAT
1
1
TP68
U3
-
4051
1
A
1
I/O4
2
PARSIG
2
1
74HC123
TP71
SIG_RET
R20
TP24
D26
A
J3
I/O3
1
TP74
3
TP5
+5ISO
CEXT
3
+5ISO
I/O2
5PPM
TEMP1
CREXT
14
I/O1
4
40.2K
0.1UF
1K
1
TL032C
R18
C6
.05%
Type Jumpers
15
+V4.096
2
5PPM
R10
Warmed Probe with
14
PACEM
TEMP1
D23
15
U4
2
6
.05%
8K
C2
0.1UF
7
-
1
0.01UF
HTR_RTN
+V2.5
1
6
TPROBE
1
U10
TP23
C136
0.047UF
2
3
J1
HTR_DRV
TP4
+
5
1
5
J1
1
J1
AD706J
2
3B
2
1
TP27
INH
13
ECG
+
2
3A
J1
VDD
1
C115
1%
-5ISO
8
1%
1
A
C
7
R19
1
2B
4
2
2A
U72
3
1
1
J1
LM4040-4.1
VSS
1
-
20K
TP69
J1
2
9
6
2
2
1
1
R11
MAXC
25.5K
0.1UF
100K
VEE
B
2
C166
U82
U67
A
1
10
1
11
2
MAXA
MAXB
D12-D21
130us
2
+V4.096
1
1
2
TP72
1
1
2 0.01UF
3.92K
2
2
TP67
1
D5-D9
R175
+V2.5
TP3
2
TEMP1
C1
TP22
D
5PPM
2
2
.05%
2
2
R217
1
1
1
222K
D1
+5ISO
5PPM
1
103.5K
E
1B
C163-C164
C169-C175
+5ISO
1
1A
C153
C156-C161
C119
74HC280
74HC595
C144-C146
PARCHK
R219
TP66
C
J4
R291
QG
B
C176
1
TP43
10
F
1
PACEM
LMC662
0.1UF
A
HIGHEST
1
TP54
6
R9
1%
D27
1
TP61
C4
1
1
U3
4053
1
2
R8
100K
+
3
TP41
CD4052
J4
TP30
1
I/3Y
F
+5ISO
1
+V2.5
0.068UF
CX
3
1%
1TP39
20K
1%
1
7
TP14
I/2Y
PM
74HC123
R255
8
BY
5
1
2
R212
16
1K
I/1Y
R
Q
100K
1%
ECG
C128
BX
1
R234
NC
11
5
12
R178
C140
1
1
AY
2
1
1
49.9K
3
I/0Y
BAW56
1
TP75
1
2.43K
LEG
TP64
I/2X
1
Q
31.6K
A
AX
13
3
U2
2
B
TP52
B
TP47
INH
12
R1
2
2
5
1
I/1X
15
E
R291
1
13
OIX
1
14
J4
U1
1
-
1
D22
R5
G=2
1
95.3K
MC34182D
3
2
BAV99
3
1
AD712J
Fc=50HZ
470PF
2
1%
1TP63
2
Fc=1.6KHZ
I/0X
U73
-
2
C139
1%
TP57
1
3
R143
8
12
1
2
1
TP55
+
U75 A
7
6
D
1
2
MC34182D
U78
3
1
2
2
1
10
2 0.01UF
2
34.0K
1K
TP59
CD4052
LSEL1
1
R237
TP19
I/2Y
1
C148
3.92K
A
10
2
1
1
I/1Y
1
75.0K
2
-
+
1
D2
2
R247
2
3
6
1
LM393
2
J4
1K
6.8M
R223
2
RED
R249
1K
OIY
I/0Y
TP49
LL
R239
AD712J
I/3Y
C
R238
750K
TP10
1
9
U4
TP51
+
TP29
CEXT
1
1%
2.43K
1
4
AD620A
(1NA118)
3
2
CREXT
6
1
1
2
1
TP2
220PF
I/3X
1
TP56
7
2
5
-5ISO
-VS
1
C168
I/2X
7
U73
TP58
R6
2
1
1%
100K
C152
1
2
C150
120PF
1
2
2
2
4
0.047UF
1
D25
1SMB75C
1
2
TP45
R240
1
8mS
TP50
1
20K
1
R251
1
TP53
+
2
1
1%
C113
R7
1
1
1
11
220PF
TP46
Fc=.05HZ
TP62
5
OIX
I/1X
15
1
+IN
1
1
1
75.0K
2
2 0.47UF
5
REF
3
2
R254
2
2
2
J4
1
13
374K
20K
1
1%
G=35
Fc=.5HZ
OUT
8
1
2
1%
8.25K
C147
1
6
TP18
R285
1
14
TP44
B
1K
1%
8.25K
C155
0.1UF
I/0X
BLACK
0.1UF
16
2
TP25
1
1
VDD
1
2
VSS
1
R284
2
1
B
INH
12
LA
C165
8
1
1
100
1
VEE
6
120PF
R265
2
A
C162
D27
1SMB75C
7
C154
1
LSEL2
9
1
U79
R245
TP48
1
TP34
+VS
-IN
2
10
2
2
LSEL1
TP1
1
75.0K
2
1K
1
2
2
1
2
J4
2
RA
7
U80
100
TP9
1
R100
20M
2
1
20M
R287
TP8
R278
G=4
R266
2
A
1
WHITE
+5ISO
R252
1
+5ISO
1
1
-V2.5
-5ISO
U11-U64
R26
HTR_DRV
1
J2
J2
J2
7
BGND
5
ANODE
9
CATHODE
U68-U71
2
10.0
U74
U76-U77
U81
4
J2
8
J2
J2
J2
J2
J2
6
RCAL_RTN
1
RCAL
3
-LED
2
+LED
NOTES
UNLESS OTHERWISE SPECIFIED
3
V-
2
4
C117
V-
0.1UF
AGND
ANALOG
GROUND
DGND
DIGITAL
GROUND
MGND
CGND
CHASSIS
GROUND
+5.5ISO
4
0.1UF
U75
V-
4
1
U10
V-
4
U4
0.1UF
GND
8
5
8
2
1
V-
4
1
1
C118
C143
0.1UF
74HC123
0
U73
2
LA-LL
U3
16
VCC
C116
V+
V+
U72
C149
V-
AD706J
RA-LL
0
8
1
RA-LA
1
8
V+
6
LM393
+
U2
-
NC
7
4
0.1UF
-5ISO
2
LINB3
1
V+
TL032C
4.THE FOLLOWING SYMBOLS REPRESENT GROUND TERMINATIONS:
0
8
V+
MC34182D
LS2(B)
LMC662
3.ALL INDUCTOR VALUES ARE IN MICROHENRIES.
8
C114
0.1UF
V+
AD712J
8
2
0
0
U2
3
1
1
2
0
LM393
1
1
2
LS1(A)
2
LEAD
2.ALL CAPACITOR VALUES ARE IN MICROFARADS AND ARE 50V.
1
+5ISO
1.ALL RESISTOR VALUES ARE IN OHMS AND ARE 1/4W,5%.
-5.5ISO
MECCA
GROUND
Figure A-35
NPB-3900Patient Connector PCB Schematic Diagram
A-67/A-68 (BLANK)