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SERVICE MANUAL NPB-295 Pulse Oximeter Caution: Federal law (U.S.) restricts this device to sale by or on the order of a physician. To contact Mallinckrodt, Inc. representative: In the United States, call 1-800-635-5267; outside the United States, call your local Mallinckrodt representative. © 2002 Mallinckrodt Incorporated. All rights reserved. 061097C-1202 0123 Nellcor Puritan Bennett Inc. 4280 Hacienda Drive Pleasanton, CA 94588 USA Telephone Toll Free 1.800.NELLCOR Mallinckrodt Europe BV Hambakenwetering 1 5231 DD”s-Hertogenbosch The Netherlands Telephone +31.73.648.5200 Nellcor Puritan Bennett Inc. is a wholly owned subsidiary of Mallinckrodt, Inc. To obtain information about a warranty, if any, for this product, contact Mallinckrodt Technical Services or your local Mallinckrodt representative. Purchase of this instrument confers no express or implied license under any Mallinckrodt patent to use the instrument with any sensor that is not manufactured or licensed by Mallinckrodt. Nellcor Puritan Bennett, Nellcor, Durasensor, and Oxisensor II, are trademarks of Mallinckrodt Incorporated. 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; 4,653,498; 5,078,136; 5,351,685; 5,368,026; 5,533,507; and 5,662,106. TABLE OF CONTENTS List of Figures List of Tables Table Of Contents .................................................................................... List Of Figures.......................................................................................... List Of Tables ........................................................................................... Section 1: Introduction ............................................................................ 1.1 Manual Overview......................................................................... 1.2 Npb-295 Pulse Oximeter Description .......................................... 1.3 Related Documents ..................................................................... Section 2: Routine Maintenance ............................................................. 2.1 Cleaning....................................................................................... 2.2 Periodic Safety And Functional Checks ...................................... 2.3 Battery ......................................................................................... Section 3: Performance Verification........................................................ 3.1 Introduction .................................................................................. 3.2 Equipment Needed...................................................................... 3.3 Performance Tests ...................................................................... 3.4 Safety Tests................................................................................. Section 4: Power-On Settings And Service Functions ........................... 4.1 Introduction .................................................................................. 4.2 Power-On Settings ...................................................................... 4.3 Service Functions ........................................................................ 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 Error Codes ................................................................................. Section 6: Disassembly Guide ................................................................ 6.1 Introduction .................................................................................. 6.2 Prior To Disassembly .................................................................. 6.3 Fuse Replacement ...................................................................... 6.4 Monitor Disassembly ................................................................... 6.5 Monitor Reassembly.................................................................... 6.6 Battery Replacement ................................................................... 6.7 Power Entry Module (Pem) Removal/Installation........................ 6.8 Power Supply Removal/Installation............................................. 6.9 Cooling Fan Removal/Installation................................................ 6.10 Display Pcb Removal/Installation ................................................ 6.11 Uif Pcb Removal/Installation........................................................ 6.12 Alarm Speaker Removal/Installation ........................................... Section 7: Spare Parts ............................................................................ 7.1 Introduction .................................................................................. Section 8: Packing For Shipment............................................................ iii v vi 1-1 1-1 1-1 1-3 2-1 2-1 2-1 2-1 3-1 3-1 3-1 3-1 3-9 4-1 4-1 4-1 4-2 5-1 5-1 5-1 5-1 5-1 5-1 5-2 5-7 6-1 6-1 6-1 6-2 6-3 6-4 6-5 6-6 6-7 6-9 6-10 6-11 6-13 7-1 7-1 8-1 iii Table of Contents 11.10 iv 8.1 General Instructions..................................................................... 8.2 Repacking In Original Carton....................................................... 8.3 Repacking In A Different Carton .................................................. Section 9: Specifications ......................................................................... 9.1 General ........................................................................................ 9.2 Electrical....................................................................................... 9.3 Physical Characteristics............................................................... 9.4 Environmental .............................................................................. 9.5 Alarms .......................................................................................... 9.6 Factory Default Settings............................................................... 9.7 Performance................................................................................. Section 10: Serial Port Interface Protocol ............................................... 10.1 Introduction .................................................................................. 10.2 Configuring The Data Port ........................................................... 10.3 Connecting To The Data Port ...................................................... 10.4 Real-Time Printout ....................................................................... 10.5 Trend Data Printout...................................................................... 10.6 Nurse Call .................................................................................... 10.7 Analog Output .............................................................................. Section 11: Technical Supplement.......................................................... 11.1 Introduction .................................................................................. 11.2 Oximetry Overview....................................................................... 11.3 Circuit Analysis............................................................................. 11.4 Functional Overview .................................................................... 11.5 Ac Input ........................................................................................ 11.6 Power Supply Pcb Theory Of Operation...................................... 11.7 Battery .......................................................................................... 11.8 User Interface Pcb (Uif) ............................................................... 11.9 Front Panel Display Pcb And Controls ........................................ Schematic Diagrams ..................................................................................... 8-1 8-1 8-3 9-1 9-1 9-1 9-1 9-1 9-2 9-2 9-2 10-1 10-1 10-1 10-2 10-3 10-6 10-6 10-7 11-1 11-1 11-1 11-2 11-2 11-3 11-3 11-4 11-5 11-8 11-9 Table of Contents LIST OF FIGURES Figure 1-1: NPB-295 Front Panel ............................................................... 1-1 Figure 1-2: User Softkey Map ..................................................................... 1-2 Figure 1-3: NPB-295 Rear Panel................................................................ 1-3 Figure 3-1: NPB-295 Controls .................................................................... 3-2 Figure 3-2: Self-Test Display ...................................................................... 3-2 Figure 3-3: Adjusting %SpO2 Upper Alarm Limit ....................................... 3-3 Figure 3-4: Adjusting % SpO2 Lower Alarm Limit ...................................... 3-3 Figure 3-5: Adjusting High Pulse Rate Alarm ............................................. 3-4 Figure 3-6: Adjusting Low Pulse Rate Alarm .............................................. 3-4 Figure 4-1: Service Function Softkeys........................................................ 4-2 Figure 4-2: Service Function Softkey Map.................................................. 4-3 Figure 4-3: Param Softkeys ........................................................................ 4-3 Figure 4-4: Print Softkeys ........................................................................... 4-4 Figure 4-5: Trend Printout........................................................................... 4-5 Figure 4-6: Errlog Printout........................................................................... 4-5 Figure 4-7: Instat Printout ........................................................................... 4-6 Figure 4-8: INFO Printout............................................................................ 4-6 Figure 4-9: Next Softkeys ........................................................................... 4-7 Figure 4-10: Alarms Softkeys ..................................................................... 4-7 Figure 6-1: Fuse Removal .......................................................................... 6-2 Figure 6-2: NPB-295 Corner Screws .......................................................... 6-3 Figure 6-3: Separating Case Halves........................................................... 6-4 Figure 6-4: NPB-295 Battery....................................................................... 6-5 Figure 6-5: Power Entry Module ................................................................. 6-6 Figure 6-6: Power Supply ........................................................................... 6-7 Figure 6-7: Cooling Fan .............................................................................. 6-9 Figure 6-8: Display PCB ........................................................................... 6-10 Figure 6-9: UIF PCB ................................................................................. 6-12 Figure 6-10: Alarm Speaker...................................................................... 6-13 Figure 7-1: NPB-295 Expanded View......................................................... 7-2 Figure 8-1: Repacking the NPB-295........................................................... 8-2 Figure 10-1: Data Port Softkeys ............................................................... 10-1 Figure 10-2: Data Port Pin Layout ............................................................ 10-3 Figure 10-3: Real-Time Printout ............................................................... 10-4 Figure 10-4: Trend Data Printout .............................................................. 10-6 Figure 11-1: Oxyhemoglobin Dissociation Curve ..................................... 11-2 Figure 11-2: NPB-295 Functional Block Diagram..................................... 11-3 Figure 11-3: UIF PCB Front End Red/IR Schematic Diagram ............... 11-11 Figure 11-4: Analog Front End Schematic Diagram............................... 11-13 Figure 11-5: Front End Power Supply Schematic Diagram.................... 11-15 Figure 11-6: SIP/SOP Interface Schematic Diagram ............................. 11-17 Figure 11-7: Data Port Drivers Schematic Diagram ............................... 11-19 Figure 11-8: CPU Core Schematic Diagram A ....................................... 11-21 Figure 11-9: CPU Memory Schematic Diagram B.................................. 11-23 Figure 11-10: Contrast and Sound Schematic Diagram A ..................... 11-25 Figure 11-11: UIF PCB Power Supply Schematic Diagram B ................ 11-27 Figure 11-12: Display Interface Schematic Diagram .............................. 11-29 Figure 11-13: UIF PCB Parts Locator Diagram ...................................... 11-31 Figure 11-14: Power Supply Schematic Diagram................................... 11-33 v Table of Contents Figure 11-15: Power Supply Parts Locator Diagram ..............................11-33 LIST OF TABLES Table 3-1: Table 3-2: Table 3-3: Table 3-4: Table 3-5: Dynamic Operating Range....................................................... 3-7 Earth Leakage Current Limits ................................................ 3-10 Enclosure Leakage Current Limits......................................... 3-11 Patient Leakage Current Limits.............................................. 3-12 Patient Leakage Current Test Configurations Mains Voltage on the Applied Part ....................................... 3-12 Table 4-1: Factory Default Settings........................................................... 4-2 Table 5-1: Problem Categories ................................................................. 5-2 Table 5-2: Power Problems....................................................................... 5-3 Table 5-3: Button Problems....................................................................... 5-4 Table 5-4: Display/Alarms Problems......................................................... 5-4 Table 5-5: Operational Performance Problems ........................................ 5-5 Table 5-6: Serial Port Problems ................................................................ 5-6 Table 5-7: Error Codes.............................................................................. 5-7 Table 6-1: Power Supply Leads Connections ........................................... 6-8 Table 7-1: Parts List .................................................................................. 7-1 Table 9-1: Default Settings........................................................................ 9-2 Table 10-1: Data Port Pin Outs ............................................................... 10-3 Table 10-2: Status Codes........................................................................10-6 Table 10-3: Nurse Call Relay Pin States................................................. 10-7 Table 10-4: Rating of Nurse Call Relay................................................... 10-7 vi SECTION 1: INTRODUCTION 1.1 1.2 1.3 1.1 Manual Overview NPB-295 Pulse Oximeter Description Related Documents MANUAL OVERVIEW This manual contains information for servicing the Nellcor model NPB-295 pulse oximeter. Only qualified service personnel should service this product. Before servicing the NPB-295, read the operator’s manual carefully for a thorough understanding of operation. Warning: Explosion hazard. Do not use the NPB-295 pulse oximeter in the presence of flammable anesthetics. 1.2 NPB-295 PULSE OXIMETER DESCRIPTION The NPB-295 is a portable pulse oximeter intended for use as a continuous noninvasive monitor of arterial oxygen saturation (SpO2) and pulse rate. It can be used on adult, pediatric and neonatal patients. Oxygen saturation and pulse rate are displayed digitally along with a plethysmographic waveform or a 10-segment blip bar that indicates pulse intensity. This monitor is intended for use in hospital and hospital-type facilities, during intra-hospital transport, and in home environments. Through the use of the four softkeys, the operator can access trend information, select an alarm limit to be changed, choose the language to be used, adjust the internal time clock, and change communications protocol. The NPB-295 can operate on AC power or on an internal battery. The controls and indicators for the NPB-295 are illustrated in Figures 1-1 through 1-3. 1 2 3 4 5 6 7 8 9 11 10 NPB-295 %SP02 BPM LIMITS 17 16 15 14 TREND SETUP 13 1. SpO2 Sensor Port 2. Low Battery Indicator 3. Power On/Off Button 4. AC/Battery Charging Indicator 5. Waveform Display 6. %SpO2 Indicator 7. Pulse Beats Per Minute display 8. Alarm Silence Indicator 9. Alarm Silence Button 100 110 LIGHT 12 10. Adjust Up Button 11. Adjust Down Button 12. Contrast Button 13. Softkeys 14. Menu Bar 15. Motion Indicator 16. Pulse Search Indicator 17. Speaker Figure 1-1: NPB-295 Front Panel 1-1 Section 1: Introduction Figure 1-2 illustrates the various functions that are available through the use of the softkeys, and how to access them. A complete explanation of the keys is provided in the NPB-295 operator's manual. BPM TREND LIMITS SETUP Normal Display Mode 95 65 %SPO2 LIGHT LCD display backlight ON or OFF EXIT SELECT Select alarm limit to be adjusted Return to main display VIEW CLOCK EXIT NEXT COMM BLIP PLETH VIEW EXIT NEXT ZOOM DUAL SPO2 PULSE Display SpO2 Data Display pulse trend data VIEW NEXT NEXT EXIT NCALL ANALOG NEXT Select Language Norm + or Norm - EXIT 0 Volt, 1 Volt, or Step Return to main display Select data from last 12/30 min. or last 1, 2, 4, 8, 12, or 24 hrs. Display both SpO2 and pulse trend data LANG Adjust baud rate and protocol SET EXIT HIST SELECT EXIT EXIT Return to main display DELETE PRINT Print trends YES Deletes all trend info NEXT EXIT Returns to prior menu Return to main display NO Return to prior trend menu Figure 1-2: User Softkey Map 1-2 EXIT Section 1: Introduction 1 2 3 TM 2X T 0.50A 250V R IPX1 NRTL/C 5 1. Equipotential (ground) Terminal 2. AC Inlet 3. DB-15 Interface Connector (Data Port) MADE IN U.S.A. NELLCOR PURITAN BENNETT EUROPE BV, 's-HERTOGENBOSCH, THE NETHERLANDS CISPR 11 Group 1 Class B 012 3 NPB-295 SN NELLCOR PURITAN BENNETT, INC. PLEASANTON, CA 94588, U.S.A. 100-120 V 200-240 V 50/60 Hz 20VA U.S. PATENTS: 4,621,643; 4,653,498; 4,700,708; 4,770,179; 4,869,254; Re. 35,122; 4,928,692; 4,934,372; 5,078,136 4 4. Fuse Receptacle 5. Voltage Selection Switch Figure 1-3: NPB-295 Rear Panel 1.3 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-295 operator’s manual. To understand the various Nellcor sensors that work with the monitor, refer to the individual sensor’s directions for use. 1-3 (Blank Page) SECTION 2: ROUTINE MAINTENANCE 2.1 2.2 2.3 2.1 Cleaning Periodic Safety and Functional Checks Battery CLEANING Caution: Do not immerse the NPB-295 or its accessories in liquid or clean with caustic or abrasive cleaners. Do not spray or pour any liquid on the monitor or its accessories. To clean the NPB-295, 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, fuse holder, or switches. Do not allow any liquids to penetrate connectors or openings in the instrument cover. Wipe sensor cables with a damp cloth. For sensors, follow each sensor's directions for use. 2.2 PERIODIC SAFETY AND FUNCTIONAL CHECKS The NPB-295 requires no calibration. The battery should be replaced every 2 years. See Battery Replacement on 6-5. The following checks should be performed at least every 2 years by a qualified service technician. 2.3 1. Inspect the exterior of the NPB-295 for damage. 2. Inspect safety labels for legibility. If the labels are not legible, contact Mallinckrodt Technical Services Department or your local Mallinckrodt representative. 3. Verify 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 the NPB-295. Contact Mallinckrodt Technical Services Department or your local Mallinckrodt representative. 5. Inspect the fuses for proper value and rating (F1 & F2 = 0.5 amp slow blow). BATTERY Mallinckrodt recommends replacing the instrument's battery every 2 years. When the NPB-295 is going to be stored for 3 months or more, remove the battery prior to storage. To replace or remove the battery, refer to Section 6, Disassembly Guide. If the NPB-295 has been stored for more than 30 days, charge the battery as described in paragraph 3.3.1. A fully discharged battery requires 14 hours with the monitor in standby, or 18 hours if it is in use, to receive a full charge. The battery is being charged whenever the instrument is plugged into AC. 2-1 (Blank Page) SECTION 3: PERFORMANCE VERIFICATION 3.1 3.2 3.3 3.4 3.1 Introduction Equipment Needed Performance Tests Safety Tests 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-295 cover. All tests except the battery charge and battery performance tests must be performed as the last operation before the monitor is returned to the user. If the NPB-295 fails to perform as specified in any test, repairs must be made to correct the problem before the monitor is returned to the user. 3.2 3.3 EQUIPMENT NEEDED Equipment Description Digital multimeter (DMM) Fluke Model 87 or equivalent Durasensor oxygen transducer DS-100A Oxisensor II oxygen transducer D-25 Pulse oximeter tester SRC-2 Safety analyzer Must meet current AAMI ES1/1993 & IEC 601-1/1998 specifications Sensor extension cable SCP-10 or MC-10 Serial interface cable EIA-232 cable (optional) Stopwatch Manual or electronic PERFORMANCE TESTS The battery charge procedure should be performed before monitor repairs whenever possible. Note: 3.3.1 This section is written using Mallinckrodt factory-set defaults. If your institution has preconfigured custom defaults, those values will be displayed. Factory defaults can be restored using the configuration mode procedure described in paragraph 4.3.3. Battery Charge Perform the following procedure to fully charge the battery. 1. Connect the monitor to an AC power source. 2. Verify the monitor is off and that the AC Power/Battery Charging indicator is lit. 3-1 Section 3: Performance Verification 3. 3.3.2 Charge the battery for at least 14 hours in standby. Power-up Performance The power-up performance tests (3.3.2.1 through 3.3.2.2) verify the following monitor functions: • Power-On Self-Test • Power-On Defaults and Alarm Limit Ranges Power On/Off Alarm Silence NPB-295 %SP02 BPM LIMITS TREND SETUP 100 110 LIGHT Softkeys Contrast Adjust Adjust Down Up Figure 3-1: NPB-295 Controls 3.3.2.1 Power-On Self-Test 1. Connect the monitor to an AC power source and verify the AC Power/Battery Charging 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 Power On/Off button. The monitor must perform the following sequence. a. Within 2 seconds all LEDs are illuminated, then all pixels on the LCD display are illuminated, after which the backlight comes on. b. The indicators remain lighted. c. The LCD display shows the Nellcor Puritan Bennett logo and the software version of the NPB-295 (Figure 3-2). NPB-295 Nellcor Puritan Bennett NPB-295 Version 1.1.0.5 Figure 3-2: Self-Test Display 3-2 Section 3: Performance Verification 3.3.2.2 d. A 1-second beep sound indicating proper operation of the speaker, and all indicators turn off except the AC Power/Battery Charging indicators. e. The NPB-295 begins normal operation. Power-On Defaults and Alarm Limit Ranges Note: When observing or changing default limits, a 10-second time-out is in effect. If no action is taken within 10 seconds, the monitor automatically returns to the monitoring display. Note: The descriptions that follow are based on the assumption that Pleth is the view that has been selected. The steps to change an alarm limit are the same if the view being used is Blip. 1. Ensure that the monitor is on. Press and release the Limits softkey. Verify the monitor emits a single beep and the plethysmograph waveform is replaced with a display of the alarm limits. The high alarm limit for %SpO2 will indicate an alarm limit of “100” inside a box (Figure 3.3). NPB-295 ALARM LIMITS BPM SPO2 170 100 UPPER 85 LOWER 40 SELECT %SP02 BPM 100 110 EXIT Figure 3-3: Adjusting %SpO2 Upper Alarm Limit 2. Note: 3. Press the Limits softkey. Press and hold the Down Arrow button. Verify the boxed number for %SpO2 upper alarm limit reduces to a minimum of “85.” A decimal point in the display indicates that the alarm limits have been changed from factory default values. Press the SELECT softkey. Verify the monitor emits a single beep and the box moves to the %SpO2 lower alarm limit of “85”. NPB-295 ALARM LIMITS BPM SPO2 170 100 85 40 UPPER LOWER SEL %SP02 BPM 100 110 EXIT Figure 3-4: Adjusting % SpO2 Lower Alarm Limit 4. Press and hold the Down Arrow button and verify the %SpO2 lower alarm limit display reduces to a minimum of “20”. 5. Press and hold the Up Arrow button and verify the %SpO2 lower alarm limit display cannot be raised past the upper alarm limit setting of “85”. 6. Press the Exit button. 3-3 Section 3: Performance Verification 7. Press the Limits softkey then press the SELECT softkey two times Verify the monitor emits a beep after each keystroke. The Pulse upper alarm limit should be “170” and should be boxed. NPB-295 ALARM LIMITS BPM SPO2 170 100 85 40 UPPER LOWER SEL %SP02 BPM 100 110 EXIT Figure 3-5: Adjusting High Pulse Rate Alarm 8. Press and hold the Down Arrow button. Verify the minimum displayed value is “40” for the Pulse upper alarm limit. 9. Press the exit button. 10. Press the Limits softkey then press the SELECT softkey three times. Verify the Pulse lower alarm limit display indicates an alarm limit of “40” and is boxed. NPB-295 ALARM LIMITS SPO2 BPM 170 100 UPPER 85 LOWER 40 SEL %SP02 BPM 100 110 EXIT Figure 3-6: Adjusting Low Pulse Rate Alarm 3-4 11. Press and hold the Down Arrow button. Verify the boxed Pulse lower alarm limit display reduces to a minimum of “30”. 12. Press and hold the Up Arrow button and verify the boxed Pulse lower alarm limit display cannot be adjusted above the Pulse high limit of “40”. 13. Press the Power On/Off button to turn the monitor off. 14. Press the Power On/Off button to turn the NPB-295 back on. 15. Press and release the Limits softkey. Verify the %SpO2 upper alarm limit display is boxed and indicates an alarm limit of “100”. 16. Press the SELECT softkey. Verify the %SpO2 lower alarm limit display is boxed and indicates an alarm limit of “85”. 17. Press the SELECT softkey a second time. Verify the Pulse upper alarm limit display is boxed and indicates an alarm limit of “170”. 18. Press the SELECT softkey a third time. Verify the Pulse lower alarm limit display is boxed and indicates an alarm limit of “40”. 19. Press the Power On/Off button to turn the monitor off. Section 3: Performance Verification 3.3.3 Hardware and Software Tests Hardware and software testing includes the following tests: 3.3.3.1 • Operation with a Pulse Oximeter Tester • General Operation Operation with a Pulse Oximeter Tester Operation with an SRC-2 pulse oximeter tester includes the following tests: 3.3.3.1.1 • Alarms and Alarm Silence • Alarm Volume Control • Pulse Tone Volume Control • Dynamic Operating Range • Nurse Call • Analog Output • Operation on Battery Alarms and Alarm Silence 1. Connect the SRC-2 pulse oximeter tester to the sensor-input cable and connect the cable to the monitor. Set the SRC-2 as follows: SWITCH RATE LIGHT MODULATION RCAL/MODE POSITION 38 LOW OFF RCAL 63/LOCAL 2. Press the Power On/Off button to turn the monitor on. After the normal power-up sequence, press the following softkeys; Setup, View, and Pleth. Verify the %SpO2 and Pulse initially indicates zeroes. 3. Move the modulation switch on the SRC-2 to LOW. 4. Verify the following monitor reactions: a. The plethysmograph waveform begins to track the artificial pulse signal from the SRC-2. b. The pulse tone is heard. c. Zeroes are displayed in the %SpO2 and Pulse displays. d. After about 10 to 20 seconds, the monitor displays saturation and pulse rate as specified by the tester. Verify the values are within the following tolerances: Oxygen Saturation Range = 79% to 83% Pulse Rate Range = 37 to 39 bpm e. 5. The audible alarm sounds and both the %SpO2 and Pulse displays flash, indicating that both parameters have violated the default alarm limits. Press and hold the Alarm Silence button on the front of the monitor for less than 3 seconds. 3-5 Section 3: Performance Verification 3.3.3.1.2 6. Verify the %SpO2 display indicates “60” and the Pulse display indicates “SEC” while the Alarm Silence button is pressed. 7. When the button is released the alarm is silenced. 8. With the alarm silenced, verify the following: a. The alarm remains silenced. b. The Audible Silence indicator lights. c. The %SpO2 and Pulse displays continue to flash. d. The pulse tone is still audible. e. The audible alarm returns in approximately 60 seconds. 9. While pressing the Alarm Silence button, press the Down Arrow button until the Pulse display indicates “30”. 10. Press the Up Arrow button and verify the displays indicate 60 SEC, 90 SEC, 120 SEC, and OFF. Release the button when the display indicates “OFF”. 11. Press and release the Alarm Silence button. Verify the Alarm Silence Indicator flashes. 12. Wait approximately 3 minutes. Verify the alarm does not return. 13. After 3 minutes, the alarm silence reminder beeps three times, and will continue to do so at approximately 3-minute intervals. Alarm Volume Control After completing the procedure in paragraph 3.3.3.1.1: 1. 3-6 Press and hold the Alarm Silence button and verify the following: a. “OFF” is displayed for approximately 3 seconds. b. After 3 seconds: • a steady tone is heard at the default alarm volume setting • the %SpO2 display indicates “VOL” • the Pulse display indicates the default setting of 5. 2. While still pressing the Alarm Silence button, press the Down Arrow button until an alarm volume setting of 1 is displayed. 3. Verify the volume of the alarm has decreased but is still audible. 4. Continue pressing the Alarm Silence button and press the Up Arrow button to increase the alarm volume setting to a maximum value of 10. 5. Verify the volume increases. Press the Down Arrow button until a comfortable audio level is attained. 6. Release the Alarm Silence button. The tone stops. Section 3: Performance Verification 3.3.3.1.3 3.3.3.1.4 Pulse Tone Volume Control 1. Press the Up Arrow button and verify the beeping pulse tone sound level increases. 2. Press the Down Arrow button and verify the beeping pulse tone decreases until it is no longer audible. 3. Press the Up Arrow button to return the beep volume to a comfortable level. Dynamic Operating Range The following test sequence verifies proper monitor operation over a range of input signals. 1. Connect the SRC-2 to the SCP-10 or MC-10, which is connected to the NPB295, and turn the NPB-295 on. 2. Place the SRC-2 in the RCAL 63/LOCAL mode. 3. Set the SRC-2 as indicated in Table 3-1. Note: An “*” indicates values that produce an alarm. Press the Alarm Silence button to silence the alarm. Table 3-1: Dynamic Operating Range SRC-2 Settings RATE MODULATION SpO2 Pulse Rate 38 HIGH2 LOW 79 - 83* 35 - 41* 112 HIGH1 HIGH 79 - 83* 109 - 115 201 LOW LOW 79 - 83* 198 - 204* 201 LOW HIGH 79 - 83* 198 - 204* Note: 4. 3.3.3.1.5 LIGHT NPB-295 Indications Allow the monitor several seconds to stabilize the readings. Verify the NPB-295 readings are within the indicated tolerances. Nurse Call Note: The Nurse Call tests must be performed with the instrument operating on AC power. 1. Connect the negative lead of a voltmeter to pin 5 and positive to pin 11 of the data port on the back of the instrument (Figure A-2 in Appendix). Ensure that the audible alarm is not silenced or turned off. 2. Set the SRC-2 to create an alarm condition. 3. Verify an output voltage at pins 5 and 11 between +5 and +12 volts DC. 4. Press the Alarm Silence button. With no active audible alarm, the output voltage at pins 5 and 11 must be between -5 and -12 volts DC. 5. With the instrument in an alarm condition, use a DVM to verify there is no continuity between pins 8 and 15 and that there is continuity between pins 7 and 15. 3-7 Section 3: Performance Verification 6. 3.3.3.1.6 Adjust the alarm limits so that there is no alarm condition. Use a DVM to verify there is continuity between pins 8 and 15 and that there is no continuity between pins 7 and 15. Analog Output Note: 1. Connect the negative lead of a voltmeter to pin 10 and positive to pin 6 of the data port on the back of the instrument (Figure A-1 in Appendix). 2. Press the following softkeys: Setup, Next, Next, and Analog. Press the 1-volt softkey. 3. Verify the output voltage is 1.0 ± 0.025 volts DC. 4. Leave the negative lead connected to pin 10 and verify 1.0 ± 0.025 volts DC on pins 13 and 14. Note: Move the positive lead back to pin 6. 6. Press the following softkeys; Setup, Next, Next, and Analog. Press the 0-volt softkey. 7. Verify the output voltage is 0.0 ± 0.025 volts DC. 8. Leave the negative lead connected to pin 10 and verify 0.0 ± 0.025 volts DC on pins 13 and 14. 9. If step 8 takes more than 2 minutes to complete, the analog output will time out. Repeat step 2 to initiate the analog output. Disconnect the voltmeter from the instrument. Operation on Battery Power 1. With the instrument operating on AC, turn on the backlight. 2. Disconnect the instrument from AC and verify the AC/Battery Charging indicator and the backlight turn off. 3. Verify the instrument continues monitoring normally and that the low battery indicator is not lit. Note: 4. 3.3.3.2 If step 4 takes more than 2 minutes to complete, the analog output will time out. Repeat step 2 to initiate the analog output. 5. Note: 3.3.3.1.7 The Analog Output tests must be performed with the instrument operating on AC power. If the low battery indicator is illuminated, perform the procedure outlined in step 3.3.1. Connect the instrument to AC and verify the backlight and AC/Battery Charging indicator turn on and that the instrument is monitoring normally. General Operation The following tests are an overall performance check of the system: 3-8 • 3.3.3.2.1 LED Excitation Test • 3.3.3.2.2 Operation with a Live Subject Section 3: Performance Verification 3.3.3.2.1 LED Excitation Test This procedure uses normal system components to test circuit operation. A Nellcor Oxisensor II oxygen transducer, 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. 3.3.3.2.2 1. Connect the monitor to an AC power source. 2. Connect an SCP-10 or MC-10 sensor input cable to the monitor. 3. Connect a D-25 sensor to the sensor-input cable. 4. Press the Power On/Off button to turn the monitor on. 5. Leave the sensor open with the LEDs and photodetector visible. 6. After the monitor completes its normal power-up sequence, verify the sensor LED is brightly lit. 7. 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. 8. Open the sensor and notice that the LED intensity increases. 9. Repeat step 7 and the intensity will again decrease. This variation is an indication that the microprocessor is in proper control of LED intensity. 10. Turn the NPB-295 off. Operation with a Live Subject Patient monitoring involves connecting the monitor to a live subject for a qualitative test. 3.4 1. Ensure that the monitor is connected to an AC power source. 2. Connect an SCP-10 or MC-10 sensor input cable to the monitor. 3. Connect a Nellcor Durasensor oxygen transducer, model DS-100A, to the sensor input cable. 4. Clip the DS-100A to the subject as recommended in the sensor's directions for use. 5. Press the Power On/Off button to turn the monitor on and verify the monitor is operating. 6. The monitor should stabilize on the subject's physiological signal in about 15 to 30 seconds. 7. Verify the oxygen saturation and pulse rate values are reasonable for the subject. SAFETY TESTS NPB-295 safety tests meet the standards of, and are performed in accordance with, IEC 601-1 (EN 60601-1, Second Edition, 1988; Amendment 1, 1991-11, Amendment 3-9 Section 3: Performance Verification 2, 1995-03) and UL 2601-1 (August 18, 1994), for instruments classified as Class 1 and TYPE BF and AAMI Standard ES1 (ANSI/AAMI ES1 1993). 3.4.1 • Ground Integrity • Electrical Leakage Ground Integrity This test checks the integrity of the power cord ground wire from the AC plug to the instrument chassis ground. The current used for this test is <6 volts RMS, 50 or 60 Hz, and 25 A. 3.4.2 1. Connect the monitor AC mains plug to the analyzer as recommended by the analyzer operating instructions. 2. Connect the analyzer resistance input lead to the equipotential terminal (grounding lug) on the rear panel of the instrument. 3. Verify the analyzer indicates 100 milliohms or less. Electrical Leakage The following tests verify the electrical leakage of the monitor: • Earth Leakage Current • Enclosure Leakage Current • Patient Leakage Current • Patient Source Current (Mains on Applied Part) Note: 3.4.2.1 For the following tests, ensure that the AC switch on the rear of the instrument is configured for the AC voltage being supplied. Earth Leakage Current This test is in compliance with IEC 601-1 (earth leakage current) and AAMI Standard ES1 (earth risk current). The applied voltage for AAMI ES1 is 120 volts AC 60 Hz, for IEC 601-1 the voltage is 264 volts AC, 50 to 60 Hz. All measurements shall be made with the power switch in both the “On” and “Off” positions. 1. Connect the monitor AC plug to the electrical safety analyzer as recommended by the analyzer operating instructions. 2. The equipotential terminal is not connected to ground. Table 3-2: Earth Leakage Current Limits AC POLARITY 3-10 LINE CORD NEUTRAL CORD LEAKAGE CURRENT Normal Closed Closed 500 µA Reversed Closed Closed 500 µA Normal Open Closed 1000 µA Normal Closed Open 1000 µA Section 3: Performance Verification 3.4.2.2 Enclosure Leakage Current This test is in compliance with IEC 601-1 (enclosure leakage current) and AAMI Standard ES1 (enclosure risk current). This test is for ungrounded enclosure current, measured between enclosure parts and earth. The applied voltage for AAMI/ANSI is 120 volts AC, 60 Hz, and for IEC 601-1 the applied voltage is 264 volts AC, 50 to 60 Hz. 1. Connect the monitor AC plug to the electrical safety analyzer as recommended by the analyzer operating instructions. 2. Place a piece of 200 cm2 foil in contact with the instrument case making sure the foil is not in contact with any metal parts of the enclosure that may be grounded. 3. Measure the leakage current between the foil and earth. Note: The analyzer leakage indication must not exceed values listed in Table 3-3. Table 3-3: Enclosure Leakage Current Limits AC LINE CORD 3.4.2.3 NEUTRAL LINE CORD POWER LINE GROUND CABLE IEC 601-1 AAMI/ANSI ES1 STANDARD Closed Closed Closed 100 µA 100 µA Closed Closed Open 500 µA 300 µA Closed Open Closed 500 µA 300 µA Open Closed Closed 500 µA 100 µA Open Open Closed 500 µA 300 µA Open Closed Open 500 µA 300 µA Patient Applied Risk Current This test is in compliance with AAMI Standard ES1 (patient applied risk current), and IEC 601-1 (patient auxiliary current). The leakage current is measured between any individual patient connection and power (earth) ground. The applied voltage for AAMI/ANSI is 120 volts AC, 60 Hz, and for IEC 601-1 the applied voltage is 264 volts AC, 50 to 60 Hz. 1. 2. Configure the electrical safety analyzer as follows: Function: Patient Leakage Range: µA Connect the monitor AC plug to the electrical safety analyzer as recommended by the analyzer operating instructions for Patient Leakage Current. 3. Connect the electrical safety analyzer patient leakage input lead to all pins of the monitor's patient cable at the end of the cable. 4. The equipotential terminal is not connected to ground. 5. All functional earth terminals are not connected to ground. 6. Measure the leakage current between the patient connector and earth. 3-11 Section 3: Performance Verification Table 3-4: Patient Leakage Current Limits 3.4.2.4 IEC 601-1 AAMI/ANSI ES1 STANDARD AC LINE POLARITY NEUTRAL LINE POWER LINE GROUND CABLE Normal Closed Closed 100 µA 10 µA Normal Open Closed 500 µA 50 µA Normal Closed Open 500 µA 50 µA Reverse Closed Closed 100 µA 10 µA Reverse Open Closed 500 µA 50 µA Reverse Closed Open 500 µA 50 µA Patient Isolation Risk Current - (Mains Voltage on the Applied Part) This test is in compliance with AAMI Standard ES1 (patient isolation risk current [sink current]), and IEC 601-1 (patient leakage current). Patient Leakage Current is the measured value in a patient connection if mains voltage is connected to that patient connection. The applied voltage for AAMI/ANSI is 120 volts AC, 60 Hz, and for IEC 601-1 the applied voltage is 264 volts AC, 50 to 60 Hz. Warning: AC mains voltage will be present on the patient cable terminals during this test. Exercise caution to avoid electrical shock hazard. 1. 2. Configure the electrical safety analyzer as follows: Function: Patient Leakage (Mains on Applied Part) Range: µA Connect the monitor AC plug to the electrical safety analyzer as recommended by the operating instructions for patient sink (leakage) current. 3. Connect the electrical safety analyzer patient leakage input lead to all connectors in the patient cable at the patient end of the cable. 4. The equipotential terminal is not connected to ground. 5. All functional earth terminals are not connected to ground. 6. The analyzer leakage current must not exceed the values shown in Table 3-5. Table 3-5: Patient Leakage Current Test Configurations Mains Voltage on the Applied Part AC LINE POLARITY 3-12 NEUTRAL LINE POWER LINE GROUND CABLE IEC 601-1 AAMI/ANSI ES1 STANDARD Normal Closed Closed 5 mA 50 µA Reverse Closed Closed 5 mA 50 µA SECTION 4: POWER-ON SETTINGS AND SERVICE FUNCTIONS 4.1 4.2 4.3 4.1 Introduction Power-on Settings Service Functions INTRODUCTION This section discusses how to reconfigure power-on default values, and access the service functions. 4.2 POWER-ON SETTINGS The following paragraphs describe how to change power-on default settings. Through the use of softkeys shown in Figure 1-2, the user can change: • alarm limits • type of display • baud rate • time and date • trends to view A decimal point is added to the right of a display when the alarm limit for that display has been changed to a value that is not a power-on default value. If the new value is saved as a power on default value, the decimal point will be removed. By using the service functions, changes can be saved as power-on default values. Some values cannot be saved as power-on default values. A SpO2 Low limit less than 80 will not be saved as a power-on default. Audible Alarm Off will not be accepted as a power-on default. An attempt to save either of these values as default will result in an invalid tone. Both values can be selected for the current patient, but they will be lost when the instrument is turned off. 4.2.1 Factory Default Settings Factory power-on default settings for the NPB-295 are listed in Table 4-1. Following the procedures listed in the paragraphs that follow can change these settings. 4-1 Section 4: Power-On Settings and Service Functions Table 4-1: Factory Default Settings Parameter 4.3 4.3.1 Default Value SpO2 High 100% SpO2 Low 85% Pulse Rate High 170 bpm Pulse Rate Low 40 bpm Alarm Volume Level 5 Alarm Silence Duration 60 seconds Alarm Silence Restriction Sound Reminder Pulse Beep Volume Level 4 Data Port Mode ASCII Baud Rate 9600 Display Pleth Trend Saturation Contrast Mid-range Language English Nurse Call Polarity Positive (NCALL+) SERVICE FUNCTIONS Introduction These functions can be used to select institutional defaults, and to access information about the patient or instrument. A Mallinckrodt Customer Service Engineer should only access some of the items available through the service functions. These functions will be noted in the text. 4.3.2 Accessing the Service Functions The sensor cable must be disconnected from the instrument to access service functions. Simultaneously press the 4th softkey from the left and the contrast button for more than 3 seconds. The menu bar will change to the headings listed in Figure 4-1. Note: If a “Sensor Disconnected” prompt appears on the screen, press the Alarm Silence button and repeat the above procedure. Note: If the above steps are performed with a sensor cable connected, only the Param and Exit softkeys appear on the screen. NPB-295 %SP02 BPM PARAM PRINT NEXT ----- EXIT Figure 4-1: Service Function Softkeys 4-2 Section 4: Power-On Settings and Service Functions Figure 4-2 can be used as a quick reference showing how to reach different softkey functions. Items reached through the Param softkey can be accessed during normal operation. Functions provided by the Print and Next softkeys cannot be accessed when a sensor cable is connected to the instrument. Each of the various functions is described in the text to follow. Param Paragraph 4.3.2.2 Yes Paragraph 4.3.2.3 Exit Save Reset Next Print Trend Exit Paragraph 4.3.2.1 and 4.3.2.4 Errlog Paragraph 4.3.2.1 Instat Contrast Info No Yes No Next Alarms Downld Exit Exit SELECT Figure 4-2: Service Function Softkey Map 4.3.2.1 Exit & Next Softkeys NEXT There are not enough buttons to display all of the options that are available at some levels of the menu. Pressing the Next button allows you to view additional options available at a given menu level. EXIT To back up one menu level, press the Exit button. The service functions can be exited by repeatedly pressing the Exit button. 4.3.2.2 Param When the Param softkey is pressed, the function of the softkeys changes as shown in figure 4-3. These options can be accessed without disconnecting the sensor cable from the instrument. NPB-295 %SP02 BPM RESET SAVE ----- EXIT Figure 4-3: Param Softkeys 4-3 Section 4: Power-On Settings and Service Functions RESET The Reset button is used to return to the factory default settings. If Yes is pressed, the instrument sounds three tones and the settings return to factory default values. When No is pressed, there are no changes made to the settings stored in memory. SAVE When adjustable values are changed from factory default, the Save button can be used to preserve the settings as institutional power-on default values. Pressing Yes stores the current settings in memory. The instrument sounds three tones indicating that the changes have been saved as power-on default values. The new saved values will continue to be used through power-on and off cycles until they are changed and saved again, or until they are reset. If No is pressed, the changed values will not be saved. Note: 4.3.2.3 An invalid tone indicates a parameter value cannot be saved as a power on default (refer to paragraph 4.2). Along with the invalid tone, a message will be displayed indicating which parameter could not be saved as a power-on default. Print PRINT Accessing the Print softkey makes four printouts available. Refer to the Appendix for information about how to make connections to the data port and how data is presented in a printout. The appropriate printout can be selected by pressing the corresponding softkey. Figure 4-4 represents the softkey configuration after the Print softkey has been selected. Up to 24 hours of trend data can be viewed on the printouts described below. When the instrument is turned on, trend data is recorded every 2 seconds. As an example, an instrument that is used 6 hours a week would take approximately 4 weeks to fill its memory. . The 24 hours of stored trend data is available for downloading to Score software for 45 days. There are no limitations for displaying or printing data. Note: The two-letter codes and the symbols that occur in the printout are described in Table 10-3. NPB-295 %SP02 BPM TREND ERRLOG INSTAT ----- INFO Figure 4-4: Print Softkeys 4-4 Section 4: Power-On Settings and Service Functions TREND A Trend printout will include all data recorded for up to 24 hours of monitoring since the last Delete Trends was performed. A new trend point is recorded every 2 seconds. Figure 4-5 is an example of a Trend printout. NPB-295 Version 1.0.0.000 TIME 01-Jul-97 14:00:00 01-Jul-97 14:00:05 01-Jul-97 14:00:10 01-Jul-97 14:00:15 01-Jul-97 18:00:43 01-Jul-97 18:00:48 NPB-295 Version 1.0.0.000 Time 01-Jul-97 18:00:53 01-Jul-97 18:00:58 01-Jul-97 18:01:03 01-Jul-97 18:01:08 01-Jul-97 18:01:13 Output Complete TREND SpO2 Limit: 30-100% PR (bpm) PA 120 220 124 220 190 220 190 220 --------Trend SpO2 Limit: 80-100% %SpO2 PR (bpm) PA ------------98 100 140 98 181* 190 99 122 232 PR Limit: 100-180 bpm %SpO2 100 100 100 100 ----- PR Limit: 60-180 bpm Figure 4-5: Trend Printout The first two lines are the column heading lines. The first line includes information about the: • type of instrument delivering the information • software level, type of printout • alarm parameters The second line is the headings for the columns. The first and second lines are printed out every 25 lines, or when a change to an alarm limit is made. Patient data is represented with a date and time stamp for the data. In the example above, the “- - -” means that a sensor was connected but no data was being received (patient disconnect). Patient data that is outside of an alarm limit is marked with an *. At the end of the printout “Output Complete” will be printed. This indicates that there was no corruption of data. If the Output Complete statement is not printed at the end of the printout, the data must be considered invalid. ERRLOG (Mallinckrodt Customer Service Engineer Only) A list of all the errors recorded in memory can be obtained by pressing the Errlog softkey. The first two lines are the column heading lines. The type of instrument producing the printout, software level, type of printout, and the time of the printout are listed in the first line. The second line of the printout is column headings. If nothing prints out, there have been no errors. An example of an Errlog printout is shown in Figure 4-6. NPB-295 Version 1.0.0.000 Op Time Error 10713:21:03 52 00634:26:01 37 Output Complete Error Log Task 12 4 Time: Addr 48F9 31A2 14600:00:07 Count 100 3 Figure 4-6: Errlog Printout INSTAT (Mallinckrodt Customer Service Engineer Only) 4-5 Section 4: Power-On Settings and Service Functions The Delete softkey, described in operator's manual, allows the user to delete the most recent trend data. The current trend data, along with the deleted trends, can be retrieved from the instrument through an Instat printout. The oldest deleted trend is Trend 1 on the Instat printout. If a Trend 1 already exists in memory from an earlier Delete, the next deleted trend will become Trend 2. Every time a Delete is performed from the User Softkeys the number of existing trends will increase by 1. The current trend will have the largest trend number. Figure 4-7 illustrates an Instat printout. The first two lines are the column heading lines. Line one is for instrument type, software revision level, type of printout, and alarm parameter settings. The second line contains the column headings. A trend point is recorded for every 2 seconds of instrument operation. Up to 24 hours of instrument operation data can be recorded. The final line on the printout shows Output Complete. This indicates that data has been successfully transmitted with no corruption. If there is no Output Complete line printed, the data should be considered invalid. NPB-295 Version 1.0.0.000 Instrument TIME Trend 01 %SpO2 PR (bpm) 01-Jul-97 14:00:00 ----01-Jul-97 14:00:05 ----01-Jul-97 14:00:10 100 120 01-Jul-97 14:00:15 100 120 NPB-295 Version 1.0.0.000 Instrument TIME Trend 01 %SpO2 PR (bpm) 01-Jul-97 14:24:24 79* 58* 01-Jul-97 14:24:29 79* 57* 01-Jul-97 14:24:29 0* 0* NPB-295 Version 1.0.0.000 Instrument TIME Trend 01 %SpO2 PR (bpm) 11-Jul-97 7:13:02 99 132* 11-Jul-97 7:13:07 99 132* 11-Jul-97 7:13:12 99 132* 11-Jul-97 7:13:17 99 132* 11-Jul-97 7:13:22 99 132* 11-Jul-97 7:13:27 99 132* 11-Jul-97 7:13:32 99 132* Output Complete SpO2 Limit: 30-100% PA SpO2 Status --SD --PS 220 220 SpO2 Limit: 80-100% PA SpO2 Status 220 PS SL PL 220 PS SL PL --PS LP SL PL SpO2 Limit: 80-100% PA SpO2 Status 220 PH 220 PH 220 PH 220 PH 220 PH 220 PH 220 PH PR Limit: 100-180 bpm UIF Status Aud BU LB AO L BU LB AO BU LB BU LB PR Limit: 60-180 bpm UIF Status Aud BU LB M BU LB AS M BU LB AS H PR Limit: 60-180 bpm UIF Status Aud BU M BU M BU M BU M BU M BU M BU M Figure 4-7: Instat Printout INFO (Mallinckrodt Customer Service Engineer Only) Pressing the INFO softkey produces a printout of instrument information (Figure 4-8). A single line will be printed. The data presented in the printout going from left to right is: • instrument type (NPB-295) • Version is the software version level • type of printout (INFO) • CRC number (Cyclic Redundancy Check) • time in seconds (current operating time/total operating time). NPB-295 Version XXXXXX INFO CRC:XXXX SEC: 123456789/987654321 Figure 4-8: INFO Printout 4-6 Section 4: Power-On Settings and Service Functions Next Additional options can be accessed from the main Service Functions menu by pressing the Next softkey. When Next is pressed, the softkeys change to the functions shown in Figure 4-9. NPB-295 %SP02 BPM DOWNLD ALARMS NEXT EXIT ----- Figure 4-9: Next Softkeys DOWNLD When Downld is selected, the instrument will display the revision of the Boot Code. To exit Downld, cycle power to the instrument by pressing the Power On/Off button. Consult the DFU provided with any downloads or upgrades to the FLASH firmware. ALARMS Pressing the Alarms softkey can change characteristics of the audible alarm. When the Alarms softkey is pressed, the softkey's functions change as shown in Figure 4-10. NPB-295 ALARMS ALLOW OFF? OFF REMINDER? SEL %SP02 YES YES BPM ----- EXIT Figure 4-10: Alarms Softkeys SELECT The Sel softkey is used to select what function of the audible alarm is going to be changed. A box can be cycled between two choices: Allow Off and Off Reminder. When Allow Off is selected, a choice is given between allowing an audible alarm Off or disabling the audible alarm Off. Pressing the Up or Down arrow key cycles between Yes and No. If Yes is selected, the operator has the option of selecting Audible Alarm Off. If No is selected, the operator is not given the option of selecting Audible Alarm Off as an alarm silence duration choice. If the audible alarm is set to Off, a reminder tone can be sounded every 3 minutes to notify the user of this condition. The Up and Down arrow keys can be used to change the choice from Yes to No. Selecting Yes enables the Reminder. Selecting No disables the Reminder when the audible alarm is set to Off. 4-7 (Blank Page) SECTION 5: TROUBLESHOOTING 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.1 Introduction How to Use this Section Who Should Perform Repairs Replacement Level Supported Obtaining Replacement Parts Troubleshooting Guide Error Codes INTRODUCTION This section explains how to troubleshoot the NPB-295. 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 Mallinckrodt Technical Services or your local Mallinckrodt representative. 5.4 REPLACEMENT LEVEL SUPPORTED The replacement level supported for this product is to the printed circuit board (PCB) and major subassembly 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 when you started troubleshooting) and continue troubleshooting as directed in this section. 5.5 OBTAINING REPLACEMENT PARTS Mallinckrodt Technical Services provides technical assistance information and replacement parts. To obtain replacement parts, contact Mallinckrodt Technical Services or your local Mallinckrodt representative. Refer to parts by the part names and part numbers listed in Section 7, Spare Parts. 5-1 Section 5: Troubleshooting Troubleshooting guide Problems with the NPB-295 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 Mallinckrodt Technical Services or your local Mallinckrodt representative. Table 5-1: Problem Categories Problem Area 1. Power • No power-up on AC and/or DC • Fails power-on self-test • Powers down without apparent cause 2. Buttons • 5.6.1 5.6.2 Monitor does not respond properly to buttons 3. Display/Alarms • Displays do not respond properly • Alarms or other tones do not sound properly or are generated without apparent cause 4. Operational Performance • Displays appear to be operational, but monitor shows no readings • Suspect readings 5. Data Port • Refer to Paragraph 5.6.3 5.6.4 5.6.5 NPB-295 serial port not functioning properly All of the categories in Table 5-1 are discussed in the following paragraphs. 5-2 Section 5: Troubleshooting 5.5.1 Power Power problems are related to AC and/or DC. Table 5-2 lists recommended actions to power problems. Table 5-2: Power Problems Condition Recommended Action 1. Battery Low indicator lights steadily while NPB-295 is connected to AC and battery is fully charged. 1. Ensure that the NPB-295 is plugged into an operational AC outlet and the AC indicator is on. 2. Check the fuses. The fuses are located in the Power Entry Module as indicated in paragraph 6.3 and Figure 6-3 of the Disassembly Guide section. Replace if necessary. 3. Open the monitor as described in section 6. Verify the power supply’s output to the battery while on AC. Disconnect the battery leads from the battery and connect a DVM to them. The voltage measured should be 6.80 ± 0.15 volts DC and the current should be 400 ± 80 mA. Replace power supply if above values are not met. 4. Check the ribbon connection from the bottom enclosure to the UIF PCB, as instructed in paragraph 6.5 of the Disassembly Guide section. If the connection is good, replace the UIF PCB. 2. The NPB-295 does not operate when disconnected from AC power. 1. The battery may be discharged. To recharge the battery, refer to paragraph 3.3.1, Battery Charge. The monitor may be used with a less than fully charged battery but with a corresponding decrease in operating time from that charge. 2. If the battery fails to hold a charge, replace the battery as indicated in Section 6, Disassembly Guide. 3. Battery Low indicator on during DC operation and an alarm is sounding. 4. Battery does not charge. There are 15 minutes or less of usable charge left on the NPB-295 battery before the instrument shuts off. At this point, if possible, cease use of the NPB-295 on battery power, connect it to an AC source and allow it to recharge (approximately 14 hours). The NPB-295 may continue to be used while it is recharging. (A full recharge of the battery while the monitor is being used takes 18 hours.) 1. Replace battery if more than 2 years old. 2. Open the monitor as described in Section 6. Verify the power supply’s output to the battery while on AC. Disconnect the battery leads from the power supply and connect a DVM to them. The voltage measured should be 6.8 ± 0.15 volts DC and the current should be 400 ± 80 mA. Replace power supply if above values are not met. 5-3 Section 5: Troubleshooting 5.5.2 Buttons Table 5-3 lists symptoms of problems relating to nonresponsive buttons and recommended actions. If the action requires replacement of a PCB, refer to Section 6, Disassembly Guide. Table 5-3: Button Problems Condition 5.5.3 Recommended Action 1. The NPB-295 responds to some, but not all buttons. 1. Replace Top Housing assembly. 2. The NPB-295 turns on but does not respond to any of the buttons. 1. Replace Top Housing assembly. 2. If the buttons still do not work, replace the UIF PCB. 2. If the buttons still do not work, replace the UIF PCB. Display/Alarms Table 5-4 lists symptoms of problems relating to nonfunctioning displays, audible tones or alarms, and recommended actions. If the action requires replacement of a PCB or module, refer to Section 6, Disassembly Guide. Table 5-4: Display/Alarms Problems Condition 1. Display values are missing or erratic. Recommended Action 1. If the sensor is connected, replace the sensor connector assembly. 2. If the condition persists, replace the sensor extension cable. 3. If the condition still persists, replace the UIF PCB. 2. Display pixels do not light. 1. Check the connection between the UIF PCB and the Display PCB. 2. If the condition does not change, replace the Display PCB. 3. If the condition still persists, replace the UIF PCB. 3. Alarm sounds for no apparent reason. 1. Moisture or spilled liquids can cause an alarm to sound. Allow the monitor to dry thoroughly before using. 2. If the condition persists, replace the UIF PCB. 4. Alarm does not sound. 1. Replace the speaker as described in Section 6, Disassembly Guide. 2. If the condition persists, replace the UIF PCB. 5-4 Section 5: Troubleshooting 5.5.4 Operational Performance Table 5-5 lists symptoms of problems relating to operational performance (no error codes displayed) and recommended actions. If the action requires replacement of a PCB or module, refer to Section 6, Disassembly Guide. Table 5-5: Operational Performance Problems Condition Recommended Action 1. The Pulse AMPLITUDE indicator seems to indicate a pulse, but the digital displays show zeroes. 1. The sensor may be damaged; replace it. 2. SpO2 or Pulse values change rapidly; Pulse AMPLITUDE indicator is erratic. 1. The sensor may be damp or may have been reused too many times. Replace it. 2. If the condition still persists, replace the UIF PCB. 2. An electrosurgical unit (ESU) may be interfering with performance: • Move the NPB-295 and its cables and sensors as far from the ESU as possible. • Plug the NPB-295 power supply and the ESU into different AC circuits. • Move the ESU ground pad as close to the surgical site as possible and as far away from the sensor as possible. 3. Verify the performance with the procedures detailed in Section 3. 4. If the condition still persists, replace the UIF PCB. 5-5 Section 5: Troubleshooting 5.5.5 Data Port Table 5-6 lists symptoms of problems relating to the data port and recommended actions. If the action requires replacement of the PCB, refer to Section 6, Disassembly Guide. Table 5-6: Serial Port Problems Condition 1. No printout is being received. 2. The RS-232 nurse call is not working. Recommended Action 1. The unit is running on battery power. Connect to an AC source. 2. The monitor’s baud rate does not match the printer’s. Change the baud rate of the monitor following instructions in paragraph 4.2.4. 3. The monitor’s data port protocol setting is incorrect. Change the monitor’s data port protocol setting following instructions in Appendix A. 4. If the condition persists, replace the UIF PCB. 1. The unit is running on battery power. Connect to an AC source. 2. Verify connections are made between pins 5 (GND) and 11 (nurse call) of the data port. 3. Verify output voltage between ground pin 5 and pin 11 is –5 to –12 volts DC (no alarm) and +5 to +12 volts DC (during alarm). 4. If the condition persists, replace the UIF PCB. 5-6 Section 5: Troubleshooting 5.6 ERROR CODES An error code is displayed when the NPB-295 detects a non-correctable failure. When this occurs, the unit stops monitoring, sounds a low priority alarm that cannot be silenced, clears patient data from the display, and displays an error code. Table 5-7 provides a complete list of error codes and possible solutions. Table 5-7: Error Codes Code 1 4 Meaning POST failure Battery dead 5 Too many microprocessor resets within a period of time 6 7 Boot CRC error Error on UIF PCB 8 11 12 Boot CRC Error Flash ROM corruption Excessive resets 52 Loss of settings 76 80 Error accessing EEPROM Institutional default values lost and reset to factory default values 81 Settings lost (settings that were different from power on default values have been lost) 82 Time clock lost 84 Internal communications error Possible Solutions Replace UIF PCB 1. Check the voltage selector switch. 2. Charge battery for 14 hours 3. Leads of battery reversed; refer to paragraph 6.5 4. Replace battery 1. Cycle power 2. Replace UIF PCB if code 5 repeatedly occurs 3. Replace Power Supply Replace UIF PCB 1. Cycle power to clear error. 2. Check voltage selector switch for proper setting. 3. Replace UIF PCB 1. Cycle power 2. Replace UIF PCB if code repeatedly occurs 1. Cycle power 2. Check and reset settings if necessary 3. Check battery 4. Replace UIF PCB if code repeatedly occurs Replace UIF PCB 1. Cycle power 2. Replace UIF PCB if code 80 repeatedly occurs 1. Cycle power 2. Check and reset settings if necessary 3. Check battery 4. Replace UIF PCB if code repeatedly occurs 1. Reset time clock 2. Battery power was lost; check the battery 3. Replace the Power Supply 1. Cycle power 2. Replace UIF PCB if code repeatedly occurs 5-7 (Blank Page) SECTION 6: DISASSEMBLY GUIDE 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 6.9 6.10 6.11 6.12 6.1 Introduction Prior to Disassembly Fuse Replacement Monitor Disassembly Monitor Reassembly Battery Replacement Power Entry Module Removal/Installation Power Supply Removal/Installation Cooling Fan Removal/Installation Display PCB Removal/Installation UIF PCB Removal/Installation Alarm Speaker Removal/Installation INTRODUCTION The NPB-295 can be disassembled down to all major component parts, including: • PCBs • battery • cables • chassis enclosures The following tools are required: • small, Phillips-head screwdriver • medium, Phillips-head screwdriver • small blade screwdriver • needle-nose pliers or 1/4-inch socket • torque wrench, 10 inch-pounds (1.13 Newton-meters) WARNING: Before attempting to open or disassemble the NPB-295, disconnect the power cord from the NPB-295. Caution: Observe ESD (electrostatic discharge) precautions when working within the unit. Note: 6.2 Some spare parts have a business reply card attached. When you receive these spare parts, please fill out and return the card. PRIOR TO DISASSEMBLY 1. Turn the NPB-295 Off by pressing the Power On/Standby button. 2. Disconnect the monitor from the AC power source. 6-1 Section 6: Disassembly Guide 6.3 FUSE REPLACEMENT 1. Complete procedure in paragraph 6.2 2. Disconnect the power cord from the back of the monitor. 3. Use a flat blade screwdriver to remove the fuse drawer from the Power Entry Module. Press down on the tab in the center of the fuse drawer with the screwdriver until a click is heard. Pull the drawer out as shown in Figure 6-1. Figure 6-1: Fuse Removal 4. 6-2 Put new, 5 x 20 mm, slow blow 0.5 amp, 250 volt fuses in the drawer and reinsert the drawer in the power entry module. Section 6: Disassembly Guide 6.4 MONITOR DISASSEMBLY Caution: Observe ESD (electrostatic discharge) precautions when disassembling and reassembling the NPB-295 and when handling any of the components of the NPB-295. 1. Set the NPB-295 upside down, as shown in Figure 6-2. Corner screws Figure 6-2: NPB-295 Corner Screws 2. Remove the four corner screws. 3. Turn the unit upright. 4. Separate the top case from the bottom case of the monitor being careful not to stress the wire harnesses between the cases. 5. Place the two halves of the monitor on the table as shown in Figure 6-3. 6. Disconnect the Power Supply from J6 on the UIF PCB. 6-3 Section 6: Disassembly Guide J6 Power supply harness Figure 6-3: Separating Case Halves 6.5 MONITOR REASSEMBLY 1. Place the two halves of the monitor on the table as shown in Figure 6-3. 2. Connect the Power Supply to J6 on the UIF PCB. 3. Place the top case over the bottom case being careful to align the lens, Power Entry Module, and the fan with the slots in the top case. Caution: When reassembling the NPB-295, tighten the screws that hold the cases together to a maximum of 10 inch pounds. Over-tightening could strip out the screw holes in the top case, rendering it unusable. 4. 6-4 Install the four corner screws. Section 6: Disassembly Guide 6.6 BATTERY REPLACEMENT Removal 1. Follow the procedure in paragraphs 6.2 and 6.4. 2. Remove the two screws from the battery bracket and lift the battery out of the bottom case as shown in Figure 6-4. 3. Be sure to note the polarity of the leads. Use needle-nose pliers to disconnect the leads from the battery. Note: The lead-acid battery is recyclable. Do not dispose of the battery by placing it in the regular trash. Dispose of properly or return to Mallinckrodt Technical Services for disposal. Figure 6-4: NPB-295 Battery Installation 4. Connect the leads to the battery. • Red wire connects to the positive terminal • Black wire connects to the negative terminal. 5. Insert the new battery into the bottom case with the negative terminal towards the outside of the monitor. 6. Install the bracket and grounding lead with the two screws. 7. Complete the procedure in paragraph 6.5. 8. Turn the monitor on and verify proper operation. 6-5 Section 6: Disassembly Guide 6.7 POWER ENTRY MODULE (PEM) REMOVAL/INSTALLATION Removal 1. Complete the procedures in paragraphs 6.2 and 6.4. 2. Push the top of the Power Entry Module (PEM) in from the outside of the case, and lift up. 3. Use needle-nose pliers to disconnect the leads from the PEM (see Figure 6-5). G N L Equipotential lug Figure 6-5: Power Entry Module Installation 6-6 4. Refer to Table 6-1 and connect the leads to the PEM. 5. Install the PEM in the bottom case with the fuse drawer facing down. A tab in the bottom case holds the PEM in place. Insert the bottom wing of the PEM between the tab and the internal edge of the side wall of the bottom case. Push the PEM down and towards the outside of the monitor until it clicks into place. 6. Position the ground line from the PEM so that it does not come into contact with components of the Power Supply PCB. 7. Complete the procedure in paragraph 6.5. Section 6: Disassembly Guide 6.8 POWER SUPPLY REMOVAL/INSTALLATION Removal 1. Complete the procedures in paragraphs 6.2 and 6.4. 2. Disconnect the leads from the battery. 3. Complete the procedure in paragraph 6.7 steps 2 through 3. 4. Use a 10-mm wrench to disconnect the Power Supply ground lead from the equipotential lug (Figure 6-5). 5. Disconnect the fan wire harness from J1 on the Power Supply PCB (see Figure 6-7). 6. Remove the seven screws shown in Figure 6-6. 7. Lift the Power Supply out of the bottom case. Figure 6-6: Power Supply 6-7 Section 6: Disassembly Guide Installation 8. Reconnect the AC leads W1, W2, and W3 to the PEM following the instructions in Table 6-1 below and Figure 6-5. Table 6-1: Power Supply Leads Connections Power Supply Lead W1 W2 W3 W4 W5 9. Wire Color or Label Green & Yellow Brown/Labeled “L” Blue/Labeled “N” Red Black Connects To Equipotential Lug “L” on the Power Entry Module “N” on the Power Entry Module Positive Battery Terminal Negative Battery Terminal Place the Power Supply in the bottom case. Caution: When installing the Power Supply, tighten the seven screws to a maximum of 10 inch-pounds. Over tightening could strip out the screw holes in the bottom case, rendering it unusable. 6-8 10. Install the seven screws in the power supply and tighten. 11. Connect the cooling fan harness to J1 of the power supply. 12. Use a 10-mm wrench to connect the power supply ground lead to the equipotential lug. Tighten to 12 inch pounds. 13. Follow the procedure in paragraph 6.7, step 5 and 6. 14. Verify the ground wire to the PEM is positioned so that it does not come into contact with components on the Power Supply PCB. 15. Reconnect W4 and W5 to the battery by following the instructions in Table 6-1. 16. Complete the procedure in paragraph 6-5. Section 6: Disassembly Guide 6.9 COOLING FAN REMOVAL/INSTALLATION Removal 1. Complete the procedures in paragraphs 6.2 and 6.4. 2. Disconnect the fan wire harness from J1 on the Power Supply PCB (see Figure 6-7). 3. Lift the cooling fan from the slots in the bottom case (see Figure 6-7). J1 Figure 6-7: Cooling Fan Installation 4. Connect the cooling fan wire harness to J1 on the Power Supply PCB. 5. Insert the cooling fan into the slots in the bottom case with the padded sides on the top and bottom and the fan's harness to the handle side of the case. 6. Complete procedure 6-5. 6-9 Section 6: Disassembly Guide 6.10 DISPLAY PCB REMOVAL/INSTALLATION Removal Caution: The LCD panel contains toxic chemicals. Do not ingest chemicals from a broken LCD panel. 1. Complete the procedures in paragraphs 6.2 and 6.4. 2. Disconnect the CCFL harness (two white wires) from J5 of the UIF PCB. 3. Use a small blade screwdriver to pry the clip from either edge of J9, then disconnect the Display PCB ribbon cable from the connector. 4. Remove the screw holding the clamp to the ferrite on the ribbon cable of the Display PCB. 5. Separate the adhesive connection of the double-sided tape and lift the Display PCB up to remove it from the top case. 6. Remove the used double-sided tape. Double-sided tape Speaker wires to J13 on the UIF PCB Keypad ribbon cable to J8 on UIF PCB CCFL wires to J5 on the UIF PCB Display ribbon cable to J9 on UIF PCB Figure 6-8: Display PCB 6-10 Section 6: Disassembly Guide Installation 7. Install new double-sided tape as shown in Figure 6-8. 8. Slide the Display PCB into the grooves in the top case. 9. Check to make sure the Display PCB is firmly seated in the top case. 10. Apply pressure between the top case and the display PCB to make good contact with the double-sided tape. 11. Connect the wire harness with two white wires to J5 of the UIF PCB. 12. Connect the Display PCB ribbon cable to J9 of the UIF PCB. 13. Install the clip over the J9 connector. 14. Secure the ferrite on the ribbon cable from the Display PCB. 15. Place the clamp over the ferrite, assure that no wires are pinched, and screw the clamp to the UIF PCB. 16. Complete the procedure in paragraph 6.5. 6.11 UIF PCB REMOVAL/INSTALLATION Removal 1. Complete the procedures in paragraphs 6.2 and 6.4. 2. Complete steps 2 through 4 of the procedure in paragraph 6.10. 3. Disconnect the keypad ribbon cable from J8 of the UIF PCB (Figure 6-8). J8 is a ZIF connector; lift up on the outer shell until it clicks, then remove the ribbon cable from the connector. 4. Disconnect the speaker cable from J13 on the UIF PCB. 5. Remove the four screws in the UIF PCB (Figure 6-9). 6. Remove the UIF PCB from the top case. 6-11 Section 6: Disassembly Guide Figure 6-9: UIF PCB Installation Caution: When installing the UIF PCB, hand tighten the five screws to a maximum of 4 inch pounds. Over-tightening could strip out the screw holes in the top case, rendering it unusable. 6-12 7. Place the UIF PCB in the top case. 8. Install the four screws in the UIF PCB. 9. Lift up on the outer shell of J8 on the UIF PCB until it clicks. 10. Insert the keypad ribbon cable into J8 of the UIF PCB. 11. Slide the outer shell of J8 down until it locks in place. 12. Connect the speaker cable to J13 of the UIF PCB. 13. Complete steps 9 through 11 of the procedure in paragraph 6.10. 14. Complete the procedure in paragraph 6.5. Section 6: Disassembly Guide 6.12 ALARM SPEAKER REMOVAL/INSTALLATION Removal 1. Complete the procedures in paragraphs 6.2 and 6.4. 2. Disconnect the speaker wire harness from J13 on the UIF PCB (see Figure 610). 3. Pull the speaker holding clip towards the center of the monitor and lift the speaker from the top housing. Holding Clip Connect speaker wires to J13 connector Figure 6-10: Alarm Speaker Installation 4. Slide the speaker into the plastic holding clip provided in the top housing. 5. Connect speaker wire harness to J13 on the UIF PCB. 6. Complete the procedure in paragraph 6.5. 6-13 (Blank Page) SECTION 7: SPARE PARTS 7.1 7.1 Introduction INTRODUCTION Spare parts, along with part numbers, are shown below. Item numbers correspond to the callout numbers in Figure 7-1. Table 7-1: Parts List Item Description Part No. 1 Top Case Assembly (Membrane Panel Included) 048499 2 Fuse Drawer 691500 3 Fuses 691032 4 Power Entry Module 691499 5 Cooling Fan 035469 6 Power Supply 035800 7 LCD PCB 035416 8 Battery 640119 9 Battery Bracket 035307 10 UIF PCB 035355 Alarm Speaker (not shown) 033494 Rubber Feet (not shown) 4-003818-00 Power Cord (not shown) U.S. 071505 International 901862 U.K. 901863 Tilt Stand (not shown) 891340 GCX Mounting Kit (not shown) 035434 7-1 Section 7: Spare Parts Figure 7-1 shows the NPB-295 expanded view with numbers relating to the spare parts list. 1 NP B- 29 5 10 2 3 9 4 8 5 6 7 Figure 7-1: NPB-295 Expanded View 7-2 SECTION 8: PACKING FOR SHIPMENT 8.1 8.2 8.3 General Instructions Repacking in Original Carton Repacking in a Different Carton To ship the monitor for any reason, follow the instructions in this section. 8.1 GENERAL INSTRUCTIONS Pack the monitor carefully. Failure to follow the instructions in this section may result in loss or damage not covered by any applicable Mallinckrodt warranty. If the original shipping carton is not available, use another suitable carton; North American customers may call Mallinckrodt Technical Services Department to obtain a shipping carton. Before shipping the NPB-295, contact Mallinckrodt Technical Services Department 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 NPB-295 by any shipping method that provides proof of delivery. 8.2 REPACKING IN ORIGINAL CARTON If available, use the original carton and packing materials. Pack the monitor as follows: 1. Place the monitor and, if necessary, accessory items in original packaging. 8-1 Section 8: Packing for Shipment Figure 8-1: Repacking the NPB-295 8-2 2. Place in shipping carton and seal carton with packaging tape. 3. Label carton with shipping address, return address and RGA number, if applicable. Section 8: Packing for Shipment 8.3 REPACKING IN A DIFFERENT CARTON If the original carton is not available, use the following procedure to pack the N-295: 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. 6. Label the carton with the shipping address, return address, and RGA number, if applicable. 8-3 (Blank Page) SECTION 9: SPECIFICATIONS 9.1 9.2 9.3 9.4 9.5 9.6 9.7 9.1 General Electrical Physical Characteristics Environmental Alarms Factory Default Settings Performance GENERAL Designed to meet safety requirements of: UL 2601-1 CSA-C22.2 No. 601-1-M90, IEC 601-1 (Class I, type BF), ISO 9919, EMC per EN 60601-1-2. 9.2 ELECTRICAL Protection Class Degree of Protection Mode of Operation Battery Type: Operating time: Recharge period: Fuses AC Power Selectable by switch 9.3 Rechargeable, sealed lead-acid, internal 8 hours minimum on new, fully charged battery under the following conditions: no alarms, no analog or serial output devices attached and no backlight 14 hours for full charge (in standby) 18 hours for full charge (in use) 2 each 5 X 20 mm Slow Blow 0.5 Amp, 250 volts 100-120 volts AC, 50/60 Hz or 200-240 volts AC, 50/60 Hz 20 VA PHYSICAL CHARACTERISTICS Dimensions Weight 9.4 Class I: per I.E.C. 601-1, clause 2.2.4 Type BF: per I.E.C. 601-1, clause 2.2.26 Continuous 3.3 in H x 10.4 in W x 6.8 in D 8.4 cm H x 26.4 cm W x 17.3 cm D 5.7 lbs., 2.6 kg ENVIRONMENTAL Operating Temperature Storage Temperature Boxed Unboxed 5° C to 40° C (+41° F to +104° F) -20° C to +70° C (-4° F to +158° F) -20° C to +60° C (-4° F to +140° F) 9-1 Section 9: Specifications 9.5 9.6 Operating Altitude Relative Humidity -390 m to +3,658 m (-1,280 ft. to +12,000 ft.) 15% RH to 95% RH, noncondensing Alarm Limit Range % Saturation: Pulse: 20-100% 30-250 bpm ALARMS FACTORY DEFAULT SETTINGS Table 9-1: Default Settings Parameter 9.7 Alarm Silence Duration 60 seconds Alarm Silence Restriction Off with reminder Alarm Volume Level 5 Baud Rate 9600 Contrast Mid-range Data Port Mode ASCII Display Pleth Language English Nurse Call Polarity Positive (NCALL+) Pulse Beep Volume Level 4 Pulse Rate High 170 bpm Pulse Rate Low 40 bpm SpO2 High 100% SpO2 Low 85% Trend Saturation PERFORMANCE Measurement Range SpO2: Pulse/Heart Rate: Accuracy SpO2 Adult: Neonatal: 9-2 Default Value 0-100% 20-250 bpm 70-100% ± 2 digits 0-69% unspecified 70-100% ± 2 digits 0-69% unspecified Section 9: Specifications 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. Neonatal accuracy is determined with Oxisensor II N-25 sensors. In addition, the neonatal accuracy specification is 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. 9-3 (Blank Page) SECTION 10: SERIAL PORT INTERFACE PROTOCOL 10.1 10.2 10.3 10.4 10.5 10.6 10.7 Introduction Configuring the Data Port Connecting to the Data Port Real-Time Printout Trend Data Printout Nurse Call Analog Output 10.1 INTRODUCTION When connected to the data port on the back of the NPB-295, printouts can be obtained, or communication of patient data can be sent to a Nellcor Oxinet II Monitoring System. Analog signals representing %SpO2, Pulse Rate, and Pulse Amplitude are provided by the data port. A nurse call function is available from the data port. Each of these is discussed in more detail in the paragraphs that follow. 10.2 CONFIGURING THE DATA PORT Items pertaining to the data port can be adjusted by following the softkey map in Figure 10-1. For a complete description of the softkeys, refer to the operator's manual. %SPO2 BPM LIMITS TREND SETUP LIGHT VIEW CLOCK NEXT EXIT LANG NEXT EXIT COMM Adjust baud rate, and protocol 95 65 Normal Display Mode Select Language NCALL ANALOG Norm + or Norm - 0 Volt, 1 Volt, or Step Figure 10-1: Data Port Softkeys The COMM key is used to select communication protocols supported by the data port. The selections are: • ASCII used for printouts • OXINET II to enable communication with Oxinet • Score TM analysis software. 10-1 Section 10: Serial Port Interface Protocol Note: When using Score software use the latest version. Contact Mallinckrodt’s Technical Services Department or your local Mallinckrodt representative to determine the latest version of Score software. • CLINICAL which is intended for Mallinckrodt use only • GRAPH used for graphical printouts (will stop real-time print data) To change the communication protocol, press Setup, Next, Select and Comm. Use the Adjust Up/Down buttons to select the desired communications protocol. The baud rate may need to be changed to match the abilities of the attached equipment. To change the baud rate, press Setup, Next, and Comm. Use the Adjust Up/Down buttons to select a baud rate of 2400, 9600, or 19200. Seven languages can be viewed on the screen and sent to the printer. The language being used can be changed by pressing Setup, Next, and Lang. Use the Adjust Up/Down buttons to select the desired language. The voltage polarity for the Nurse Call, available at pins 11 and 5, can be selected through the softkeys. By pressing Setup, Next, Next, and NCALL, a choice of NORM + or NORM - is offered. NORM + sets the voltage to +5 volts DC to + 12 volts DC and NORM - sets the voltage to- 5 volts DC to - 12 volts DC when there is no audible alarm. When an audible alarm occurs, these voltages switch polarity. This signal is only available if the instrument is operating on AC power. For more information on Nurse Call, refer to paragraph A6 in this Appendix. Analog calibration signals are provided to adjust a recorder to the output of the instrument. Selectable calibration signals are 1.0 volt DC, 0.0 volts DC, and Step. The signals are accessed by pressing Setup, Next, Next, and Analog. For more information on the analog signals, refer to paragraph A7 in this Appendix. 10.3 CONNECTING TO THE DATA PORT Data is transmitted in the RS-232 format (pins 2,3, and 5) or RS-422 (pins 1,4,9, and 12). RS 232 data can be transmitted a maximum of 25 feet. The pin outs for the data port are listed in the chart below. 10-2 Section 10: Serial Port Interface Protocol Table 10-1: Data Port Pin Outs Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Note: Signal RXD+ (RS-422 positive input) RXD_232 (RS-232 input) TXD_232 (RS-232 output) TXD+ (RS-422 positive output) Signal Ground (isolated from earth ground) AN_SpO2 (analog saturation output) Normally Open, Dry Contacts, for Nurse Call (N.O. with no audible alarm) Normally Closed, Dry Contacts, for Nurse Call (N.C. with no audible alarm) RXD- (RS-422 negative input) Signal Ground (isolated from earth ground) Nurse Call (RS-232 level output {-5 to -12 volts DC with no audible alarm} {+5 to +12 volts DC with audible alarm}) TXD- (RS-422 negative output) AN_PULSE (analog pulse rate output) AN_PLETH (analog pleth wave output) Nurse Call Common for Dry Contacts When the instrument is turned off, the contact at pin 7 becomes closed and the contact at pin 8 becomes open. The pin layout is illustrated in Figure 10-1. The conductive shell is used as earth ground. An AMP connector is used to connect to the data port. Use AMP connector (AMP P/N 747538-1), ferrule (AMP P/N 1-747579-2) and compatible pins (AMP P/N 66570-2). 9 10 11 12 13 14 15 1 2 3 4 5 6 7 8 Figure 10-2: Data Port Pin Layout When building an RS-422 cable, a resistor (120 ohm, 1/4 watt, 5%) must be added between pins 1 and 9 of the cable. The end of the cable with the resistor added must be plugged into the NPB-295. This resistor is not necessary for RS-232 cables. The serial cable must be shielded (example: Beldon P/N 9616). Connectors at both ends of the serial cable must have the shield terminated to the full 360 degrees of the connector's metal shell. If rough handling or sharp bends in the cable is anticipated, use a braided shield. 10.4 REAL-TIME PRINTOUT When a real-time display or printout is being transmitted to a printer or PC, a new line of data is printed every 2 seconds. Every 25th line is a Column Heading line. A column heading line is also printed any time a value in the column heading line is changed. A real-time printout is shown below in Figure 10-2. Note: If the data output stops transmitting, turn the power off and back on again, or, if connected to a PC, send an XON (Ctrl-q) to resume transmission. 10-3 Section 10: Serial Port Interface Protocol NPB-295 TIME 01-Jul-97 01-Jul-97 01-Jul-97 01-Jul-97 01-Jul-97 01-Jul-97 01-Jul-97 01-Jul-97 01-Jul-97 01-Jul-97 01-Jul-97 01-Jul-97 01-Jul-97 01-Jul-97 01-Jul-97 01-Jul-97 01-Jul-97 01-Jul-97 01-Jul-97 01-Jul-97 01-Jul-97 01-Jul-97 01-Jul-97 NPB-295 TIME 01-Jul-97 NPB-25 TIME 01-Jul-97 01-Jul-97 VERSION 1.0.0.1 %SpO2 14:00:00 100 14:00:02 100 14:00:04 100 14:00:06 100 14:00:08 100 14:00:10 100 14:00:12 100 14:00:14 100 14:00:16 100 14:00:18 100 14:00:20 100 14:00:22 --14:00:24 --14:00:26 --14:00:28 --14:00:30 --14:00:32 --14:00:34 --14:00:36 --14:00:38 --14:00:40 --14:00:42 --14:00:44 --VERSION 1.0.0.1 %SpO2 14:00:46 --VERSION 1.0.0.1 %SpO2 14:00:48 79* 14:00:50 79* CRC: XXXX BPM 120 124 190 190* 190* 190* 190* 190* 190* 190* 190* ------------------------CRC: XXXX BPM --CRC: XXXX BPM 59* 59* SpO2 Limit: 30-100% PA Status 220 220 220 220 PH 220 PH 220 PH 220 PH 220 PH 220 PH LB 220 PH LB 220 PH LB --SD LB --SD LB --SD --SD --SD --SD --PS --PS --PS --PS --PS --PS SpO2 Limit: 30-100% PA Status --PS SpO2 Limit: 80-100% PA Status 220 SL PL LB --PS SL PL LB PR Limit: 100-180 bpm PR Limit: 100-180 bpm PR Limit: 100-180 bpm Figure 10-3: Real-Time Printout 10.4.1 Column Heading NPB-295 VERSION 1.0.0.1 %SpO2 TIME CRC: XXXX BPM SpO2 Limit: 30-100% PA Status PR Limit: 100-180 bpm The first two lines of the chart are the Column Heading. Every 25th line is a Column Heading. A column heading is also printed whenever a value of the Column Heading is changed. There are three Column Heading lines shown in Figure 10-2. Using the top row as the starting point, there are 25 lines before the second Column Heading is printed. The third Column Heading was printed because the SpO2 limits changed from 30-100% to 80-100%. Data Source NPB-295 TIME VERSION 1.0.0.1 %SpO2 CRC XXXX BPM SpO2 Limit: 30-100% PA Status PR Limit: 100-180 bpm Data in the highlighted box above represents the source of the printout or display, in this case the NPB-295. Software Revision Level NPB-295 TIME VERSION 1.0.0.1 %SpO2 CRC: XXXX BPM SpO2 Limit: 30-100% PA Status PR Limit: 100-180 bpm The next data field tells the user the software level, (Version 2.0.0.0) and a software verification number (CRC XXXX). Neither of these numbers should change during normal operation. The numbers will change if the monitor is serviced and receives a software upgrade. 10-4 Section 10: Serial Port Interface Protocol Alarm Limits NPB-295 VERSION 1.0.0.1 TIME %SpO2 CRC: XXXX BPM SpO2 Limit: 30-100% PA Status PR Limit: 100-180 bpm The last data field in the top line indicates the high and the low alarm limits for %SpO2 and for the pulse rate (PR). In the example above, the low alarm limit for SpO2 is 30% and the high alarm limit is 100%. Pulse Rate alarm limits are, low 100 bpm, and high 180 bpm. Column Headings NPB-295 VERSION 1.0.0.1 %SpO2 TIME CRC: XXXX BPM SpO2 Limit: 30-100% PA Status PR Limit: 100-180 bpm Actual column headings are in the second row of the Column Heading line. Patient data that is presented in the chart, from left to right, is the time that the line was obtained, the current %SpO2 value being measured, the current Pulse Rate in beats per minute (bpm), the current Pulse Amplitude (PA), and the operating status of the NPB-295. 10.4.2 Patient Data and Operating Status Time TIME 01-Jul-97 14:00:00 %SpO2 100 BPM PA 120 Status 2 2 0 The Time column represents the NPB-295 real-time clock. Patient Data NPB-295 VERSION 1.0.0.1 TIME 01-Jul-97 14:00:06 %SpO2 100 CRC: XXXX BPM SpO2 Limit: 30-100% Status PA 190* 2 2 0 PR Limit: 100-180 bpm PH Patient data and the operating status of the unit are highlighted in the display above. Parameter values, at the time of the printout, are displayed directly beneath the heading for each parameter. In this example the %SpO2 is 100, and the PR is 190 beats per minute. The “*” next to the 190 indicates that 190 beats per minute is outside of the alarm limits, indicated in the top row, for pulse rate. If no data for a parameter is available, three dashes (- - -) will be displayed in the printout. PA is an indication of Pulse Amplitude. The number can range from 0 to 254. There are no alarm parameters for this value. It can be used for trending information. It is an indication of a change in pulse volume, pulse strength, or circulation. Operating Status NPB-295 VERSION 1.0.0.1 TIME 01-Jul-97 14:00:06 %SpO2 100 CRC: XXXX BPM 190* SpO2 Limit: 30-100% PA Status 220 PR Limit: 100-180 bpm PH The Status column indicates alarm conditions and operating status of the NPB-295. In this example the PH means Pulse High. A complete listing of the status codes is listed in Table 10-2. As many as 4 codes can be displayed at one time in the Status column. 10-5 Section 10: Serial Port Interface Protocol Table 10-2: Status Codes Code AO AS BU LB LM LP MO PH PL PS SD SH SL --* Note: Meaning Alarm Off Alarm Silence Battery in Use Low Battery Loss of Pulse with Motion Loss of Pulse Motion Pulse Rate High Limit Alarm Pulse Rate Low Limit Alarm Pulse Search Sensor Disconnect Sat High Limit Alarm Sat Low Limit Alarm No Data Available Alarm Parameter Being Violated A Sensor Disconnect will also cause three dashes (- - -) to be displayed in the patient data section of the printout. 10.5 TREND DATA PRINTOUT In the ASCII mode, the format of data displayed when a trend printout is requested is similar to that of the real-time data. The only differences are that “TREND” is displayed in the top row instead of the “CRC:XXXX” software verification number, and there is no “Status” column. In the GRAPH mode, the NPB-295 trend printout is a copy of the trend displayed on the NPB-295’s screen. Readings are displayed in 2-second intervals. The values on each row are an average for the 2-second period. At the end of the printout, an “Output Complete” line indicates that the transmission was successful. If the “Output Complete” line is not present, the data should be considered invalid. NPB-295 VERSION 1.0.0.1 TIME 22-Nov-97 14:00:05 22-Nov-97 14:00:10 22-Nov-97 14:00:15 Output Complete %SpO2 100 100 100 PR (bpm) SpO2 Limit: PA 120 121 120 150 154 150 CRC: XXXX 30-100% PR Limit: 100-180 bpm Figure 10-4: Trend Data Printout 10.6 NURSE CALL An RS-232 Nurse Call signal (pins 5 and 11) can be obtained by connecting to the data port. It is in the form of a positive or negative voltage chosen by the user. This function is only available when the instrument is operating on AC power. The RS232 Nurse Call will be disabled when the unit is operating on battery power. 10-6 Section 10: Serial Port Interface Protocol The remote location will be signaled anytime there is an audible alarm. If the audible alarm has been set Off, or silenced, the Nurse Call function is also turned off. Pin 11 on the data port is the RS-232 Nurse Call signal and pin 5 is ground (see Figure 10-1). When there is no audible alarm, the voltage between pins 10 and 11 will be a -5 volt DC to -12 volts DC, or +5 volts DC to +12 volts DC, depending on the option chosen via the softkeys (either NCALL+ or NCALL-). Whenever there is in an audible alarm, the output between pins 5 and 11 will reverse polarity. An internal Nurse Call relay (pins 7, 8, and 15) provides dry contacts that can be used to signal a remote alarm. These contacts can be used whether the instrument is operating on AC or on its internal battery. Pin 15 is common, pin 7 is N.O., and pin 8 is N.C. Table 10-3 shows the state of the contacts for alarm and no alarm conditions, and for instrument off. Table 10-3: Nurse Call Relay Pin States Pin No Alarm or Alarm Silenced Audible Alarm Instrument Off 7 N.O. Open Closed Closed 8 N.C. Closed Open Open Table 10-4: Rating of Nurse Call Relay Maximum Input Voltage 30 volts AC or DC (polarity is not important) Load Current 120 mA continuous (peak 300 mA @ 100 ms) Minimum Resistance 26 ohms to 50 ohms (40 ohms typical) during alarms Ground Reference Isolated Ground Electrical Isolation 1,500 Volts 10.7 ANALOG OUTPUT Analog outputs are provided for Saturation, Pulse Rate, and a Plethysmographic waveform. These outputs are available only if the monitor is operating on AC power. The output voltage is 0.0 to + 1.0 volt DC for all three parameters. A 1.0 volt DC output for saturation equals 100%; for pulse rate it equals 250 bpm; and for plethysmographic waveform, it equals 255 pulse amplitude units (pau). The voltage will decrease as the values for these parameters decrease. If no data for a parameter is available, the output voltage for that parameter will be a 0.0 volts DC. At power-on after the completion of POST, the instrument will initiate an automatic three-step calibration signal. The calibration signal will begin at 0.0 volts DC and hold that point for 60 seconds. It will then jump up to 1.0 volt DC and hold that value for 60 seconds. The third part of the calibration signal is a stair step signal. The stair step signal will start at 0.0 volts DC and increase up to 1.0 volt DC in 1/10 volt increments. Each increment will be held for 1 second. Through use of the softkeys, the 0.0 volts DC, 1.0 volt DC, or stair step signal can be selected individually (refer to Section 4). 10-7 (Blank Page) SECTION 11: TECHNICAL SUPPLEMENT 11.1 11.2 11.3 11.4 11.5 11.6 11.7 11.8 11.9 11.10 Introduction Oximetry Overview Circuit Analysis Functional Overview AC Input Power Supply Theory of Operation Battery User Interface PCB (UIF) Front Panel Display PCB and Controls Schematic Diagrams 11.1 INTRODUCTION This Technical Supplement provides the reader with a discussion of oximetry principles and a more in-depth discussion of NPB-295 circuits. Block and schematic diagrams support a functional overview and detailed circuit analysis. The schematic diagrams are located at the end of this supplement. 11.2 OXIMETRY OVERVIEW The NPB-295 is based on the principles of spectrophotometry and optical plethysmography. Optical plethysmography uses light absorption technology to reproduce waveforms produced by pulsatile blood. The changes that occur in the absorption of light due to vascular bed changes are reproduced by the pulse oximeter as plethysmographic waveforms. Spectrophotometry uses various wavelengths of light to qualitatively measure light absorption through given substances. Many times each second, the NPB-295 passes red and infrared light into the sensor site and determines absorption. The measurements that are taken during the arterial pulse reflect absorption by arterial blood, nonpulsatile blood, and tissue. The measurements that are obtained between arterial pulses reflect absorption by nonpulsatile blood and tissue. By correcting “during pulse” absorption for “between pulse” absorption, the NPB-295 determines red and infrared absorption by pulsatile arterial blood. Because oxyhemoglobin and deoxyhemoglobin differ in red and infrared absorption, this corrected measurement can be used to determine the percent of oxyhemoglobin in arterial blood: SpO2 is the ratio of corrected absorption at each wavelength. 11.2.1 Functional versus Fractional Saturation The NPB-295 measures functional saturation, that is, oxygenated hemoglobin expressed as a percentage of the hemoglobin that is capable of transporting oxygen. It does not detect significant levels of dyshemoglobins. In contrast, some instruments such as the IL282 Co-oximeter measure fractional saturation, that is, oxygenated hemoglobin expressed as a percentage of all measured hemoglobin, including dyshemoglobins. Consequently, before comparing NPB-295 measurements with those obtained by an instrument that measures fractional saturation, measurements must be converted as follows: 11-1 Section 11: Technical Supplement 100 functional fractional saturation = saturation x 100-(% carboxyhemoglobin +%methemoglobin) 11.2.2 Measured Versus Calculated Saturation When saturation is calculated from a blood gas measurement of the partial pressure of arterial oxygen (PaO2), the calculated value may differ from the NPB-295 SpO2 measurement. This is because the calculated saturation may not have been corrected for the effects of variables that can shift the relationship between PaO2 and saturation. Figure 11-1 illustrates the effect that variations in pH, temperature, partial pressure of carbon dioxide (PCO2), and concentrations of 2,3-DPG and fetal hemoglobin may have on the oxyhemoglobin dissociation curve. Saturation (%) 100 pH Temperature PCO2 2,3-DPG Fetal Hb pH Temperature PCO2 2,3-DPG 50 0 50 100 PO2 (mmHg) Figure 11-1: Oxyhemoglobin Dissociation Curve 11.3 CIRCUIT ANALYSIS The following paragraphs discuss the operation of each of the printed circuit boards within the NPB-295 pulse oximeter. Refer to the appropriate schematic diagram at the end of this supplement. 11.4 FUNCTIONAL OVERVIEW The monitor functional block diagram is shown in Figure 11-2. Most of the functions of the NPB-295 are performed on the UIF PCB functions on the UIF PCB include the 331 and PIC, and Memory. Other key components of the NPB-295 are the Power Entry Module (PEM), Power Supply, and the LCD Display. The Display module includes the Membrane Panel and the LCD Display. The Membrane panel contains annunciators and push buttons, allowing the user to access information and to select various available parameters. The LCD Display PCB contains the LCD, which presents the patient data. 11-2 Section 11: Technical Supplement Power Entry Module Power Supply Fuses Battery Charger Membrane Panel DC Supply Battery LCD Display RTC Alarm Speaker MC68331 CPU Data port System RAM 256K Flash ROM 256K UIF PCB PIC 16C63 Front End Patient Connection Figure 11-2: NPB-295 Functional Block Diagram 11.5 AC INPUT A selector switch on the back of the NPB-295 allows the user to connect the monitor to AC power ranging from 100 volts AC to 240 volts AC. The switch has two positions, one for 100 volts AC through 120 volts AC and one for 210 volts AC through 240 volts AC. Verify the switch selection matches the AC power at your location before plugging the monitor into an AC outlet. AC power enters the NPB-295 through the Power Entry Module (PEM). A 0.5 amp fuse is placed in both the “Hot” and “Neutral” lines. These user accessible fuses are located in a fuse drawer, which is part of the PEM on the back of the instrument. 11.6 POWER SUPPLY PCB THEORY OF OPERATION The NPB-295 uses an unregulated linear power supply. This power supply provides the DC power needed to charge the battery, run the cooling fan and to power the User Interface PCB (UIF). Electro Static Discharge (ESD) protection and patient isolation from mains, is also provided by the power supply. AC power from the PEM is passed through a step-down transformer, T2, which has two primary and two secondary windings. If switch SW1 on the back of the monitor is in the 120 volts AC position, the primary windings are in parallel. The primary windings are in series if SW1 is in the 240 volts AC position. Each secondary winding is fused with a 2.0 amp fuse (F1 and F2). If a short circuit should occur in the DC circuitry, these fuses prevent the transformer from overheating. The output of the transformer varies, depending on load and input. Voltage measured between the outlet of a secondary winding and ground can be from 6 to 20 volts AC. High frequency noise from the AC line and from the UIF PCB is filtered by C6 and C8 before passing through the bridge rectifier. Two outputs from the bridge rectifier are used in the NPB-295. The fan control circuit uses the negative output. The positive output is the Main DC ranging from 7 to 18 volts DC. This positive voltage is used for the battery circuit and to power the UIF PCB. 11-3 Section 11: Technical Supplement 11.6.1 Fan Control A fan control circuit on the Power Supply PCB is used to control the temperature inside the case of the NPB-295. The temperature sensor used in this circuit is U3. U3 turns on the cooling fan if the temperature inside the case gets above approximately 31° C. The cooling fan runs on approximately 15 volts DC. Note: The fan is disabled if the unit is running on battery power. 11.6.2 Battery Circuits Two circuits are included in this section of the Power Supply PCB. One circuit is used to charge the battery and the other circuit provides battery protection. Charging Circuit The Power Supply will charge the battery any time the NPB-295 is connected to AC power even if the monitor is not turned on. The voltage applied to the battery is 6.8 ± 0.15 volts DC and is current limited to 400 ± 80 mA. Battery voltage is checked periodically by the processor. A signal from the processor turns the charging circuit off to allow this measurement to be taken. If the processor determines the battery voltage is below 5.85 ± 0.1 volts DC a low battery alarm is declared. Battery Protection Two types of battery protection are provided by the Power Supply: protection for the battery and protection from the battery. Switch SW2 is a resettable component that protects the battery. SW2 opens and turns the charging circuit off if the temperature of the battery rises above 50° C. If the output of the battery exceeds 2.0 amps, F3 opens. F3 protects the battery from a short to ground of the battery output. Protection from the battery is provided for the event the battery is connected backwards. Components on the UIF PCB and the Power Supply block and limit the voltage to provide protection to circuits in the instrument. 11.7 BATTERY A lead-acid battery is used in the NPB-295. It is rated at 6 volts DC, 4 amphours. When new and fully charged, the battery will operate the monitor for 8 hours under the following conditions: no alarms, no analog or serial output devices attached and no backlight. The battery can withstand 400 charge/discharge cycles. Recharging the battery to full capacity will take 14 hours in standby or 18 hours if the instrument is being used. Changeover from AC to battery power will not interrupt the normal monitoring operation of the NPB-295. However, when the unit is running on battery power, the cooling fan, data port, RS-232 Nurse Call, and LCD backlight will be turned off. The 331 CPU on the UIF PCB monitors the charge level of the battery. If the voltage of the battery falls below 5.85 ± 0.1 volts DC, a low battery alarm is declared. The instrument will continue monitoring and alarming for 15 minutes then power down. This 15-minute alarm and power-down sequence can be repeated by turning the unit back on, provided the battery voltage remains above the critical level. 11-4 Section 11: Technical Supplement Battery voltage is considered critical when it decreases to 5.67 ± 0.1 volts DC. If the instrument is turned on and battery voltage is at the critical level, an error code is displayed and the instrument will not monitor the patient. The instrument will run for 15 minutes with the error code displayed and then power down. Both conditions can be corrected by plugging the unit into an AC source for 14 hours to allow the battery to fully recharge. 11.8 USER INTERFACE PCB (UIF) The UIF PCB is the heart of the NPB-295. All functions except the unregulated DC power supply, LCD display and membrane keypad reside on the UIF PCB. 11.8.1 Regulated DC Power Supply The UIF PCB receives the Main_DC unregulated voltage of 7 to 18 volts DC from the Power Supply or 5.8 to 6.5 volts DC from the internal battery. From either of these signals, the regulated power supply on the UIF PCB generates +10.0, -10.0, 5.0 and +5.0 volts DC. 11.8.2 Controlling Hardware Two microprocessors reside on the UIF PCB. The CPU is a Motorola MC68331CF (331). The second microprocessor PIC16C63 is referred to as the PIC and is controlled by the CPU. CPU The 331 is the main controller of the NPB-295. The 331 controls the front panel display, data storage, instrument status, sound generation, and monitoring and controlling the instrument's power. The 331 also control data port communication and the Nurse Call feature. Battery voltage is checked periodically by the processor. A signal from the processor turns the charging circuit off to allow this measurement to be taken. If the processor determines that the battery voltage is below 5.85 ± 0.1 volts DC, a low battery alarm is declared by the PIC. If battery voltage on the UIF PCB is measured below 5.67 ± 0.1 volts DC, the monitor will display an error code and sound an audible alarm. Voltages measured at the battery will be slightly higher than the values listed above. The user will be unable to begin monitoring a patient if the battery voltage remains below this point. If either event occurs, plug the unit into an AC source for 14 hours to allow the battery to fully recharge. When the NPB-295 is powered by AC, the RS-232 Nurse Call function is available. If no audible alarm conditions exist, the output will be -5 to -12 volts DC or +5 volts DC to +12 volts DC. These voltages are dependent upon the option selected by the use of the softkeys. Should an audible alarm occur, the output will change polarity. The 331 also controls a set of dry contacts provided by a relay on the UIF PCB. The relay will function normally on AC power or on the internal battery power. When the CPU sends a tone request, three items are used to determine the tone that is sent to the speaker. First, pulse tones change with the %SpO2 value being measured. The pulse beep tone will rise and fall with the measured %SpO2 value. Second, three levels of alarms, each with its own tone, can occur; High, Medium, and Low priority. Third, the volume of the pulse tone and alarm is user adjustable. Alarm volume can 11-5 Section 11: Technical Supplement be adjusted from level 1 to level 10, with level 10 being the highest volume. Setting the volume to zero can turn off pulse tones. A real-time clock is provided by the NPB-295. A dedicated real-time clock chip provides this. User's interface includes the front panel display and the keypad. By pressing any of nine keys on the keypad the operator can access different functions of the NPB-295. The 331 will recognize the keystroke and make the appropriate change to the monitor display to be viewed by the operator. The monitor uses any changes made by the operator until it is turned off. Default values will be restored when the unit is powered-on again. Patient data is stored by the NPB-295 and can be downloaded to a printer through the data port provided on the back of the monitor. An in-depth discussion of the data port is covered in the Appendix of this manual. PIC The PIC controls the SpO2 function and communicates the data to the 331. A pulse width modulator (PWM) function built into the processor controls the SpO2 function. PWM signals are sent to control the intensity of the LEDs in the sensor and to control the gain of the amplifiers receiving the return signals from the photodetector in the sensor. Analog signals are received from the SpO2 circuit on the UIF PCB. An A/D function in the PIC converts these signals to digital values for %SpO2 and heart rate. The values are sent to the 331 to be displayed and stored. 11.8.3 Sensor Output/LED Control The SpO2 analog circuitry provides control of the red and IR LEDs such that the received signals are within the dynamic range of the input amplifier. Because excessive current to the LEDs will induce changes in their spectral output, it is sometimes necessary to increase the received signal channel gain. To that point, the CPU controls both the currents to the LEDs and the amplification in the signal channel. At initialization of transmission, the LEDs' intensity level is based on previous running conditions, and the transmission intensity is adjusted until the received signals match the range of the A/D converter. If the LEDs reach maximum output without the necessary signal strength, the PWMs will increase the channel gain. The PWM lines will select either a change in the LED current or signal gain, but will not do both simultaneously. The LED drive circuit switches between red and IR transmission and disables both for a time between transmissions in order to provide a no-transmission reference. To prevent excessive heat build-up and prolong battery life, each LED is on for only a small portion of the duty cycle. Also, the frequency of switching is well above that of motion artifact and not a harmonic of known AC transmissions. The IR transmission alone, and the red transmission alone, will each be on for about one-fifth of the duty cycle; this cycle is controlled by the PIC. 11-6 Section 11: Technical Supplement Input Conditioning Input to the SpO2 analog circuit is the current output of the sensor photodiode. In order to condition the signal current, it is necessary to convert the current to voltage. Because the IR and red signals are absorbed differently by body tissue, their received signal intensities are at different levels. Therefore, the IR and red signals must be demodulated and then amplified separately in order to compare them to each other. De-multiplexing is accomplished by means of two circuits that alternately select the IR and red signals. Two switches that are coordinated with the IR and red transmissions control selection of the circuits. A filter with large time-constant follows to smooth the signal and remove noise before amplification. 11.8.4 Signal Gain The separated IR and red signals are amplified so that their DC values are within the range of the A/D converter. Because the received IR and red signals are typically at different current levels, the signal gain circuits provide independent amplification for each signal as needed. The gain in these circuits is adjusted by means of the PWM lines from the CPU. After the IR and red signals are amplified, they are filtered to improve the signal-tonoise ratio and clamped to a reference voltage to prevent the combined AC and DC signal from exceeding an acceptable input voltage from the A/D converter. 11.8.5 Variable Gain Circuits The two variable gain circuits are functionally equivalent. The gain of each circuit is contingent upon the signal's received level and is controlled to bring each signal to approximately 3.5 volts. Each circuit uses an amplifier and one switch in the triple SPDT analog-multiplexing unit. 11.8.6 AC Ranging In order to achieve a specified level of oxygen saturation measurement and to still use a standard-type combined PIC and A/D converter, the DC offset is subtracted from each signal. The DC offsets are subtracted by using an analog switch to set the mean signal value to the mean of the range of the A/D converter whenever necessary. The AC modulation is then superimposed upon that DC level. This is also known as AC ranging. Each AC signal is subsequently amplified such that its peak-to-peak values span onefifth of the range of the A/D converter. The amplified AC signals are then filtered to remove the residual effects of the PWM modulations and, finally, are input to the PIC. The combined AC and DC signals for both IR and red signals are separately input to the A/D converter. 11.8.7 Real-Time Clock (RTC) Real time is tracked by the NPB-295. As long as battery power or AC power is available, the instrument will keep time. If the battery is removed, the time clock will have to be reset. The LCD will display the time and date for the data period highlighted by the cursor on a trend display. A time stamp is printed for each line of data on a printout. Realtime data is displayed and printed as Day, Month, Year, Hours, Minutes, and Seconds. 11-7 Section 11: Technical Supplement 11.8.8 Patient Data Storage Whenever the NPB-295 is turned on, it stores a “data point” in memory every 2 seconds (regardless of whether the NPB-295 is monitoring a patient or not). Up to 50 alarm limit changes will also be stored in trend data. The NPB-295 can store up to 24 hours of trend data. . The 24 hours of stored trend data is available for downloading to Score software for 45 days. There are no limitations for displaying or printing data. Caution: Changing alarm limit settings uses up trend memory space. Change alarm limits only as needed. Note: Note: Trend memory always contains the MOST RECENT 24 hours of data, with newly collected data over-writing the oldest data on a rolling basis. The NPB-295 continues to record data points as long as the monitor is powered on, with “blank” data points collected if no sensor is connected to the monitor or patient. “Blank” data will overwrite older patient data if the memory becomes full. Therefore, if you want to save old patient data, it is important that you turn your monitor off when you are not monitoring a patient, and that you download the trend memory, using Score software, before it fills up and over-writes the old data with new data (or “blank” data). When using Score software use the latest version. Contact Mallinckrodt’s Technical Services Department or your local Mallinckrodt representative to determine the latest version of Score software. If battery power is disconnected or depleted, trend data and user settings will be lost. All data is stored with error detection coding. If data stored in memory is found to be corrupted, it is discarded. 11.9 FRONT PANEL DISPLAY PCB AND CONTROLS 11.9.1 Display PCB The Front Panel LCD PCB provides visual patient data and monitor status. At power up, all indicators and pixels are illuminated to allow verification of their proper operation. Next, the Nellcor Puritan Bennett logo and the software revision level are displayed. After this cycle has been completed, the instrument is ready to begin monitoring. The LCD allows the user to select among several different types of displays. Graphs, which are used for trend screens, can be displayed. Real-time patient data can include a plethysmographic waveform and digital values for SpO2 and BPM. If a plethysmograph is not desired, the operator can select to view only digital data for SpO2 and BPM along with a blip bar to show pulse intensity. 11.9.2 Membrane Keypad A membrane keypad is mounted as part of the top case. A ribbon cable from the keypad passes through the top case and connects to the UIF PCB. Nine keys allow the operator to access different functions of the NPB-295. These keys allow the user to select and adjust the alarm limits, cycle power to the unit, and to silence the alarm. Alarm volume and alarm silence duration can also be adjusted via the keypad. Pressing the softkeys can access a number of other functions. These functions are discussed in greater detail in Section 4. 11-8 Section 11: Technical Supplement Five LEDs are also part of the membrane keypad. These LEDs indicate AC power available, low battery, pulse search, alarm silence, and noise/motion. 11.10 SCHEMATIC DIAGRAMS The following part locator diagrams and schematics are included in this section: Figure 11-3: UIF PCB Front End Red/IR Schematic Diagram Figure 11-4: Analog Front End Schematic Diagram Figure 11-5: Front End Power Supply Schematic Diagram Figure 11-6: SIP/SOP Interface Schematic Diagram Figure 11-7: Data Port Drivers Schematic Diagram Figure 11-8: CPU Core Schematic Diagram A Figure 11-9: CPU Memory Schematic Diagram B Figure 11-10: Contrast and Sound Schematic Diagram A Figure 11-11: UIF PCB Power Supply Schematic Diagram B Figure 11-12: Display Interface Schematic Diagram Figure 11-13: UIF PCB Parts Locator Diagram Figure 11-14: Power Supply Schematic Diagram Figure 11-15: Power Supply Parts Locator Diagram 11-9 +10V 2 I52 1 3 +10V Q18 2N3906S I222 I20 C55 47P 50V R49 49.9K I13 I14 I27 R8 49.9K C54 0.1U 50V R14 249K 2N3906S Q10 I28 2 - 3 + - 8 4 1 3 4 U3 I15 AD822 +10V DET+ + 6 2 1 R20 18.7K 5 8 C53 0.1U 50V + 6 - 8 4 - U22 LT1013S I24 7 6 2 3 I12 - R32 24.9K U58 LP311D 6 7 4 R36 R39 10.0K 8 I18 R154 11.0K I330 VREF 6 11 10 9 INH A B C V+ 12 13 XO X1 2 1 Y0 Y1 5 3 Z0 Z1 14 3 Y 15 Z 4 2 +10V V+ R6 100K 8 7 6 4 5 I40 I32 I31 R5 249K R26 174K I90 R47 12.1K I2 R3 374K R46 374K 4 3 + + - 6 2 R7 10.0K 5 9 + 8 - + - 3 R43 10.0K U10 TLC339CD 14 PIC_RB7 12 U27 LT1013S I23 I55 R23 150K I39 R4 24.9K R11 100K 50V C61 0.033U +10V I317 PIC_BRC7 PIC_RA1 1 + + - 6 I37 LT1013S U23 7 R37 24.9K C31 0.1U 50V +10V 4 3 R35 49.9K R117 24.9K I38 R16 100K 2 C49 0.01U VREF I329 R41 10.0K C62 0.01U I33 + + - +10V 6 2 I4 5 U23 LT1013S I42 C63 0.01U I25 R28 24.9K 5 + 4 - + 3 R17 10.0K U10 TLC339CD 2 PIC_RB6 - 12 I224 R27 150K PIC_BRC6 C64 220P 50V I35 VREF -5V I26 C60 220P 50V C59 0.01U - I34 50V R44 49.9K I22 R19 100K I8 8 -10V 16 -10V I301 50V C57 0.033U U53 13 DG201S 5 C48 0.01U +10V +10V 7 -10V 14 4 R30 24.9K V- GND 15 - C30 0.1U 50V C56 0.01U U30 LT1013S 5 V+ 8 I157 - 2 U53 DG201S 13 5 -10V C94 22P 4 CD4053S I283 - + 6 I6 R42 24.9K V- GND VEE 7 VSS R45 1.10K 6 - - I19 -10V +10V + LT1013S + + 11 4 I9 I36 100K V- GND U30 50V C95 0.1U 50V +10V R31 24.9K R40 249K 9 10 C65 1000P U44 VCC 16 X 1 U53 DG201S 13 C66 0.1U R9 174K +10V 50V C51 0.033U U27 + LT1013S 1 + 6 7 I41 8 2 +10V I5 R25 100K 50V C50 0.033U I21 R10 100K I7 5 -10V I10 I11 3 R1 24.9K I30 1 V- GND R2 2.74K C52 47P 50V 13 1 +10V I17 U53 DG201S 2 50V U3 AD822 PIC_RB5 PIC_RB4 PIC_RA0 VREF I331 V+ -10V C58 22P 7 -10V R15 249K PIC_RB2 PIC_RB1 PIC_RB3 + 5 -4 R12 150K R34 49.9K 2 +8 +10V R21 24.9K +10V -10V I16 5 + + U22 LT1013S -10V -10V I314 + - R18 49.9K +10V R22 30.1K VREF I305 DET- 1 3 I29 +10V I3 R29 49.9K 2 R13 49.9K +10V + R33 49.9K R38 121 R24 100K I1 PIC_RA2 PIC_RB3 PIC_RB1 PIC_RB2 ANALOG FRONT END +10V LED_IDRV 7 + 6 - + 3 - 12 U10 TLC339CD 1 +10V -10V C2 C3 I226 0.1U Z5U 0.1U Z5U DG201S BYPASS 035354 Figure 11-3 UIF PCB Front End Red/IR Schematic Diagram 11-11 VCC I48 R192 10.0K Q11 2 2N3906S 3 PIC_RC1 I68 VCC2N3906S Q25 2 2N3906S Q24 1 3 R54 10.0K R75 20.0K 3 1 R74 20.0K LED- INH A B C 12 13 XO X1 R66 20.0K Q2 MPSA06S 2 U2 6 11 10 9 3 I304 C74 4.7P 50V 2 1 Y0 Y1 5 3 Z0 Z1 VCC 16 X 14 Y 15 Z 6 + LT1013S 2 U31 + VREF 8 1 4 I69 I59 VREF I60 I70 R68 174K R67 100K 6 11 10 9 12 13 U1 INH A B C VCC 16 XO X1 2 1 Y0 Y1 5 3 Z0 Z1 R64 80.6K X 14 Y 15 Z 4 I73 VSS 8 C68 0.1U R53 10.0K VREF I93 R94 10.0K C4 Z5U R52 10.0K I74 R73 100K 3 1 2 I62 C72 0.1U Q3 2N3904S R72 174K C70 0.1U I61 R69 80.6K 1 3 Q4 2N3904S 2 C75 I82 R76 100K VREF DET+ LED+ RCAL I302 R63 10K_0.1% R57 100K C71 0.1U I75 4 3 C73 0.1U + + - 6 I57 PIC_BRC0 VREF +10V I56 5 2 R60 30.1K 11 + 10 - + 3 I81 PIC_RB2 PIC_RB3 PIC_RB4 PIC_RB5 PIC_RB6 PIC_RB7 I211 I45 R158 121 SCK MISO MOSI I43 I91 I95 R51 221 HC49S 10MHZ Y2 10MHZ 1 4 C76 33P VREF I50 50V U31 LT1013S 1 Y4 2 R56 11.5K C67 0.033U VREF VDD MCLR VSS1 VSS2 11 12 13 14 15 16 17 18 I80 FRONT_END_RST 15 LED- 20 1 8 19 RC0 RC1 RC2 RC3 RC4 RC5 RC6 RC7 I79 ATP-SM 16 I84 OSC1 OSC2 PIC16C63 PIC_RSTL VREF I58 9 10 Z5U 33P 2 21 22 23 24 25 26 27 28 I78 PIC_10MHZ 4053 BYPASS 0.1U I49 035354 C1 0.47U 20V C5 0.1U R71 20.0K R61 10.0 16 + VEE 7 SPO2-29X RB0 RB1 RB2 RB3 RB4 RB5 RB6 RB7 I223 VREF CD4053S I63 3 1 Q1 MPSA06S 1 2 3 4 5 6 7 8 9 10 11 12 13 14 PIC_BRC1 I47 R70 10.0K U11 RA0 RA1 RA2 RA3 RA4 RA5 2 3 4 5 6 7 I76 -5V C69 0.1U PIC_RB1 PIC_RA2 PIC_RA1 PIC_RA0 I77 I83 8 I298 I51 VREF R188 49.9K VEE 7 VSS I88 I225 1 I54 R48 10.0K I85 LED_IDRV 7 CD4053S 1 3 1N914S I89 VREF I87 CR10 R62 100K VCC I64 LED+ I303 I86 C6 Z5U 1 3 I53 R50 3.32K 0.1U I65 Q9 2 MPSA56S I46 2 R55 10.0K 1 I67 R65 20.0K 1 I71 2 MPSA56S Q8 3 I66 U10 TLC339CD 13 I72 R58 10.0K 14 I44 I291 I92 U55 VCC X 15 Y 4 Z 7 VEE 8 VSS INH A B C 6 11 10 9 PIC_RC0 PIC_RC6 PIC_RC7 XO 12 X1 13 Y0 Y1 2 1 Z0 Z1 5 3 C84 0.1U Z5U CD4053S PIC_BRC7 PIC_BRC6 - 12 R59 10.0K DETJ16 CON_SPO2 VREF Figure 11-4 Analog Front End Schematic Diagram 11-13 VDD C78 330P 50V I110 CR11 1N914S 3 1 1 I108 + C77 1000P 5% C13 0.1U Z5U I114 VC VIN 5 4 S/S VSW 8 VSW 6 GNDS FB 2 VFB 7 I113 C32 10U 16V U50 GND CLK_312KHZ C33 47U 10V 2 C12 0.1U Z5U R83 49.9 1 1 6 + 3 20V 22U C43 5 LT1373S 4 HIGH CURRENT I126 I116 2 VCC I120 2 VCC C37 22U 20V VIN + TP6 8 2 3 U12 VIN VOUT 1 GND1 GND2 GND3 6 7 GND4 78L05D CR2 MBRS130 + C40 47U 10V I119 RAW+10V 1 I98 74HC00S 2 C34 47U 10V I117 + RAW-5V RAW-5V I97 1 2 MBRS130 SH9 (CONTRAST) RAW-10V AGND TP2 + C36 47U 10V RAW-10V +10V C38 22U 20V TP4 C10 0.1U Z5U C41 47U 10V CR4 I121 C8 0.1U Z5U I96 + -5V R79 49.9 MBRS130 SH9 (CONTRAST) TP5 C9 0.1U Z5U CR6 I99 R87 1.0 5% R81 49.9 2 R78 34.8K VREF 1 + 10 C39 22U 20V TP7 7 U4 8 R80 182 1 + 8 I118 CR3 MBRS130 CR5 MBRS130 I100 R77 11.5K 9 + 3 NFB R82 4.99K RESETL I115 T2 LPE-4841 C35 47U 10V TP3 + -10V R86 49.9 C11 0.1U Z5U C42 22U 20V + CLK_156KHZ VCC 16 9 PIC_10MHZ C7 0.1U Z5U VCC I127 U51 VCC CP0 10 CP1 15 RST Q0 Q1 Q2 Q3 GND 74HC4520S 11 12 13 14 8 I109 I107 I106 I320 16 1 I101 U51 VCC CP0 2 CP1 7 RST Q0 Q1 Q2 Q3 GND 74HC4520S 3 4 5 6 8 CLK_312KHZ CLK_156KHZ I104 I105 I103 R88 10.0K 035354 Figure 11-5 Front End Power Supply Schematic Diagram 11-15 VDD I135 CLK_156KHZ U9 3 4 5 SIPSOP_EN 9 74HC10S VDD I136 I133 11 C79 330P 50V 7 U14 VDD I138 4 3 74HC14S 1 2 13 9 10 11 12 74HC10S SDA I155 + T1 CR7 6 2 5 3 4 2 1 8 I149 14 2 I141 U9 5 2 I 1 7 4 6 3 Q6 SI9936 I148 MBRS130 7 5 7 U14 74HC14S U18 R174 681 8 I140 5 7 U54 R194 681 3 8 TXD U19 R175 681 3 VDD R166 4.99K TH RXD 8 5 NC_RELAY 9 U15 74HC14S 8 7 I ISCL U15 74HC14S ITX485_EN 6 5 7 IVDD 8 IVDD I161 I I158 14 13 14 12 7 R176 10.0K I 11 U15 74HC14S 10 7 I ITXD U15 74HC14S TH IVDD 6 5 7 IVDD R163 10.0K I 6N136 2N3906S Q26 U20 R165 453 3 6N136 VDD I162 R109 10.0K 2 3 R164 10.0K 1 2N3906S Q27 RCV_232 R110 10.0K 2 3 RCV_485 1 I164 I163 I 1 U6 6 NC_NO R177 453 N.C. AQV414A NC_COM NC_NC 5 4 VDD 2 VDD I156 R195 10.0K 2 7 IVDD 6 7 I165 6 I U15 74HC14S TH 2 VDD ISDA 4 7 14 5 I 6N136 IVDD VDD I 3 U15 74HC14S R173 10.0K I 2 TX485_EN 2 7 I160 SCL I I154 IVDD IVDD C18 0.1U Z5U 14 1 I C46 47U 10V IVDD I159 14 6N136 VDD I 6 3 + C19 0.1U Z5U 4 2 Z5U R171 10.0K TH 2 74HC10S + IVDD IVDD R168 100 VDD C17 0.1U I152 OUT 3 IN GND1 GND2 14 3 6 1 C44 47U 10V TH 2 14 1 IVDD U49 LT1129CST-5 6 6N136 VDD 5 8 U17 R172 681 IVDD I151 MBRS130 CR8 C45 47U 10V VDD VDD I139 C80 U14 330P74HC14S 50V 7 U14 U9 1 C16 0.1U Z5U 7 I150 I153 IVDD R170 1.00K 14 VDD U14 Q6 VDD 74HC14S 13 8 1 SI9936 U14 14 12 7 2 74HC14S 74HC14S I134 VDD I137 R169 1.00K 14 8 7 I143 R167 100 14 6 10 I142 VDD I132 1 C15 0.1U Z5U U7 6 I146 C14 0.1U Z5U N.O. AQV210EHA 035354 5 4 2 I147 Figure 11-6 SIP/SOP Interface Schematic Diagram 11-17 RS-232 DRIVER I243 IVDD C21 0.1U Z5U I RS-485 DRIVER C22 0.1U Z5U I240 I241 C24 0.1U Z5U IVDD I242 VCC ITX485_EN 4 TXENAB ITXD 5 TXIN RXIN+ 12 RXD+ 12 R1OUT ITXD 11 T1IN 9 NC_LVL 10 R1IN 10 TXD- TXOUT+ 9 RXD_232 TXD_232 R2OUT R2IN T2IN V- I168 GND U5 ADM202E 15 I TXD+ C23 0.1U IVDD CR9 2 I 10V 1 I244 3 CR19 2 I 1 CR16 2 1 CR13 2 U16 7 1 2 1 I GND2 6 I167 NC_232 SMCJ10C Z5U GND1 8 T2OUT 7 6 TXOUT- 13 T1OUT 14 BAV99 RSROUT C2- RCV_232 I166 I CMOS LEVEL RS232 LEVEL 5 3 2 11 RXD- I BAV99 RCV_485 RXIN- C1C2+ C26 0.1U Z5U VCC 3 RSENAB 3 4 16 V+ BAV99 3 C1+ 3 RCV_232 C25 0.1U Z5U MAX489 1 BAV99 14 2 I238 CR26 RXD_232 J1 TXD_232 NC_232 TXD+ NC_NO NC_COM NC_NC TXD- IVDD VDD 3 REF1 3 R179 1.00K I169 C20 0.1U Z5U SCL SDA REF3 AD1 OUT0 2 AN0 11 AD2 OUT1 1 AN1 AGND OUT2 16 AN2 DGND OUT3 I MAX520S 15 8 1 + U32 C81 1.0U 20V + NC_LVL U13 + I I 6 2 I IVDD I 8 TLE2425CD VIN VOUT 1 4 3 2 I 035354 + U47 GND U8 + C27 0.1U Z5U R180 4.02K 0.1% 6 LT1013S 5 2 I172 REF_1V U47 2 I I 2 3 R181 6.04K 0.1% + R183 1.00K 7 1 IVDD C83 1.0U 20V + 6 F1 CR15 500MA 17 CON_DB15F TH TH NC_NC I I C97 0.1U Z5U I178 + LT1013S - NC_COM R191 100M 1/4W TH AN_SPO2 CR12 1 I174 C93 0.1U Z5U IVDD IVDD I171 I I NC_NO AN_PULSE CR14 R178 1.00K 7 IVDD I170 2 I LT1013S 2 2 10 I175 1 1 AD0 6 C82 1.0U 20V 13 9 5 I176 BAV99 8 IVDD 3 ISDA REF2 14 2 7 + U32 R182 1.00K 5 1 ISCL + 6 - BAV99 4 REF0 4 BAV99 8 BIT DAC AN_PLETH + LT1013S 3 I173 3 12 + AN_SPO2 Analog Outputs IVDD C47 47U 10V AN_PULSE I177 16 1 9 2 10 3 11 4 12 5 13 6 14 7 15 8 RXD+ RXD- I DT1 600V TH E AN_PLETH C145 0.1U Z5U I I IVDD I I Figure 11-7 Data Port Drivers Schematic Diagram 11-19 I279 C133 0.1U X7R 0805 C134 0.1U X7R 0805 C127 0.1U X7R 0805 C121 0.1U X7R 0805 C124 0.1U X7R 0805 C126 0.1U X7R 0805 C123 0.1U X7R 0805 C128 0.1U X7R 0805 C129 0.1U X7R 0805 VDD RESETL C125 0.1U X7R 0805 /RESET RP6 10K I237 I236 1 2 3 4 I336 68 I219 BERRL HALTL POTCSL L1 BATT_CHECK A601 BK-LT-ONL CRIT_BATT-L L2 NC_RELAY B601 L6 TX485_EN B601 L8 B601 TXD IRQ7L I239 L11 SCK MISO MOSI SIPSOP_EN B601 PCS0L I328 B601 8 7 6 5 8 7 6 5 L13 RP10 10K 53 52 RXD TXD 45 43 44 46 47 48 49 SCK MISO MOSI /PCS0-/SS /PCS1 /PCS2 /PCS3 1 2 3 4 1 2 3 4 B601 L9 B601 BACKGROUND DEBUG CONNECTOR I324 VDD J15 1 3 5 7 2 4 6 8 CON_BDM8 035354 I334 PWMA PWMB PCLK PAI IC1 IC2 IC3 IC4/OC5 OC1 OC2 OC3 OC4 RP9 I333 10K L10 RESETL /IRQ1 /IRQ2 /IRQ3 /IRQ4 /IRQ5 /IRQ6 /IRQ7 /AVEC 130 129 128 4 15 14 13 5 12 11 10 6 I337 SCL 77 76 75 74 73 72 71 87 I125 RXD SDA /BERR /HALT I124 PWM_VOL FONTSEL AC_OK-L LOW_BATT-L BTN_PRS_L RTCSEL TURN_OFF DISP_EN RWD_RST PWM_FREQ CLRIII AC_LED VDD 70 69 BKPTL FREEZE IPIPE1 IPIPE0 I245 2 8 17 29 34 40 51 59 67 83 95 101 106 117 127 VSS1 VSS2 VSS3 VSS4 VSS5 VSS6 VSS7 VSS8 VSS9 VSS10 VSS11 VSS12 VSS13 VSS14 VSS15 68331 A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 A17 A18 A19-/CS6 A20-/CS7 A21-/CS8 A22-/CS9 A23-/CS10 D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 90 20 21 22 23 24 25 26 27 30 31 32 33 35 36 37 38 41 42 121 122 123 124 125 56 54 55 58 57 112 113 114 115 118 119 120 121 R/WLR DSL ASL SDA2 SERCLK SERDATA ROMLATECSL I112 VDDI 61 VDDSYN C139 0.1U Z5U X1 GND 4 X2 DS1302Z REAL TIME CLOCK VDD RP11 10K TP58 R96 SCL R155 4.99K POTCSL R/WL DSACK0 DSACK1 VDD I201 I207 6 SCL SDA2 RA1 RA13 RA17 RROMLATECSL R/WLR RDSPLRDL RPBCSL RDSPLCSL I209 I212 I313 I213 I229 I228 I230 I179 C136 10U 16V SDA 1 2 3 A0 A1 A2 PWR 8 Z5U 0.1U C132 GND 4 WP CR29 2 BOOTROML RAMLCSL RAMHCSL DSPLYCSL I128 MAN_RST 2 PBCSL 3 I327 4 A601 1 VDD VC1206 5.6V Z5U U46 1 PBRST DSPLRDL VCC 8 TD TOL ST ~RST GND R135 1.00K 7 RESETL 6 RST 5 I131 LTC1232 I129 + 128X8 SCL AT24C01A C131 0.1U L4 U38 5 7 VDD I231 XFC 2 C144 4.7P 50V 3 VDD I205 I204 C130 0.1U Z5U 8 1 RST PWR1 I/O PWR2 SCLK FRONT_END_RST CLKOUT I208 78 5 6 7 RTCSEL SERDATA SERCLK I281 U43 49.9K D[0:15] I338 I339 I340 BKPTL IPIPE0 IPIPE1 FREEZE RP16 VDDI 120 RBOOTROML 4 5 RRAMLCSL 3 6 RRAMHCSL 2 7 RDSPLCSL 1 8 RDSPLRDL R186 121 RPBCSL PSLEDDR 121 R152 I312 VDDSYN 60 I197 R153 TP59 RAMPWR I198 I308 A[17:0] D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 MODCLK XTAL I307 BATLEDDR ASLEDDR I282 MOTNLEDDR R184 A17 RROMLATECSL 221 66 EXTAL 62 I306 R89 CLKOUT XFC 64 A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 111 110 109 108 105 104 103 102 100 99 98 97 94 93 92 91 R-/W 79 /DSACK0 89 /DSACK1 88 /DS 85 82 /AS 81 SIZ0 80 SIZ1 /RMC 86 /BKPT-DSCLK IPIPE-DSO IFETCH-DSI FREEZE-QUOT /TSTIME-TSC /CSBOOT /BR-/CS0 /BG-/CS1 /BGACK-/CS2 FCO-/CS3 FC1-/CS4 FC2-/CS5 R105 RA0 121 16 RA1 RP1 15 RA2 RA3 120 14 13 RA4 12 RA5 11 RA6 RA7 10 RA8 9 RA9 16 RP2 15 RA10 12014 RA11 RA12 13 RA13 12 RA14 11 RA15 10 RA16 9 RA17 121 I102 ECPSM29T C120 0.1U X7R 0805 C135 0.1U X7R 0805 VDD1 VDD2 VDD3 VDD4 VDD5 VDD6 VDD7 VDD8 VDD9 VDD10 VDD11 VDD12 VDD13 Y3 C122 0.1U X7R 0805 1 7 18 28 39 50 63 65 84 96 107 116 126 32.768KHZ 1 4 C137 47U 10V I210 U45 8 7 6 5 + A601 VDDI 8 7 6 5 L3 1 2 3 4 VDD RWD_RST I130 R151 221 WD_RST C141 0.01U I232 I234 R149 10.0M I233 I235 R150 Y1 332K 32.768KHZ 4 1 C140 22P ECPSM29T 50V C138 22P 50V Figure 11-8 CPU Core Schematic Diagram A 11-21 VDD I295 C91 + C119 0.1U 47U Z5U 10V A[17:0] L12 FLASHPWR VDD A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 A17 I318 TP55 A601 11 10 9 8 7 6 5 4 42 41 40 39 38 37 36 35 34 2 33 R/WL 43 12 BOOTFLSHL 14 FLSHOEL VDD U42 128KX16 A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 PWR D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 RY BYTE RESET WE CE OE 23 RP3 16 15 14 13 12 11 10 9 15 17 19 21 24 26 28 30 16 18 20 22 25 27 29 31 RESETL 44 GND1 13 GND2 32 29F200 8 7 6 5 4 3 2 1 RP4 120 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 D0 D8 D1 D9 D2 D10 D3 D11 D4 D12 D5 D13 D6 D14 D7 D15 120 FLASH RAMPWR 1 3 5 ROMLATECSL J14 R147 10.0K 2 4 6 L14 FRAMPWR BOOTFLSHL C101 0.1U Z5U A[17:0] CON_3X2 BOOTROML R146 121 VDD R148 10.0K I195 2 I278 U4 3 74HC00S 1 W-RL 2 U40 3 74HC32S I144 1 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 A17 12 11 10 9 8 7 6 5 27 26 23 25 4 28 3 31 2 RAMHCSL 22 RESETL 30 24 R/WL 29 I227 + U41 A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 CEL CEH OE WE 128KX8 PWR D0 D1 D2 D3 D4 D5 D6 D7 C118 10U 16V C28 0.1U Z5U 32 13 14 15 17 18 19 20 21 D8 D9 D10 D11 D12 D13 D14 D15 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 A17 RAMLCSL RESETL RAMOEDIS R/WL GND 16 431000S 12 11 10 9 8 7 6 5 27 26 23 25 4 28 3 31 2 22 30 24 29 U21 A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 CEL CEH OE WE I335 128KX8 PWR D0 D1 D2 D3 D4 D5 D6 D7 GND 32 13 14 15 17 18 19 20 21 D0 D1 D2 D3 D4 D5 D6 D7 B601 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 A17 D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 I246 I247 I248 I252 I251 I250 I249 I256 I255 I254 I253 I260 I259 I258 I257 I280 I111 I276 I275 I274 I273 I269 I270 I271 I272 I265 I266 I267 I268 I261 I262 I263 I264 16 431000S R/WL RESETL RAMHCSL RAMLCSL R156 10.0K D[15:0] 035354 D[15:0] Figure 11-9 CPU Memory Schematic Diagram B 11-23 VDD I199 I310 PWM_FREQ VDD I321 U56 R99 6.49K 3 + 2 - R93 4.99K + TLC27L2 8 R92 1.00K 1 C105 47U 10V + 4 - 1 2 4 7 VDD I309 PWM_VOL I200 I311 R98 249K R100 10.0K + C96 1.0U 20V + 5 + 6 - R102 100K - 8 U56 I315 TLC27L2 7 U26 VCC VI2 VI4 N.C. + C110 47U 10V + C104 47U 10V + TH GND1 6 VO1 5 VO2 8 1 2 C106 47U 10V C88 0.1U J13 GND2 3 TDA7052A R101 1.00K SPEAKER DRIVER 4 VDD DISP_EN 4 RESETL 5 I292 U4 I293 R95 10.0K 6 3 Q12 SI9933 4 6 74HC00S 5 I94 VDD C87 0.047U I180 TP40 2 VC1206 5.6V 1 CR32 I196 R198 11.5K C92 0.1U Z5U U24 X9313 EPOT TP44 R85 24.9K VDD I294 POTCSL 7 SERCLK 1 SERDATA 2 CS VCC INC VH 3 4 VW 5 3 VL U/ D VSS 4 6 VDD TP49 TP48 8 + + - I277 6 U25 LT1013S 5 2 RAW-10V R90 49.9K R84 10.0K 8 1 + + - 6 U25 LT1013S 7 VEE 2 RAW-10V RAW-5V VDD 12 13 U4 11 74HC00S 035354 I332 C29 0.1U Z5U Figure 11-10 Contrast and Sound Schematic Diagram A 11-25 TP13 CR17 2 1 TP1 R119 249K BATT R203 10.0M CON_4L_156 To Linear Power Supply I216 R204 10.0K I217 + 5 + 6 - I323 + 2 - 8 4 + C108 2 GNDVIA HG1 AC_OK-L 1 R104 10.0K Open Collector Output Active Low Indicator TP46 7 3 4 AC_OK 6 4 1 SI9953 Q16 2 5 8 R123 200K C113 0.1U 100K C116 R114 0.1U CR30 1 VDD CR1 C115 1.0U 20V 3 + R121 20.0K I184 BAT54 1 TURN_OFF 1 R202 10.0M 2 R127 49.9K VDD 3 Q15 2N3904S Critical at approx 5.68V V_REF 8 + 2 - 8 - R108 6.81K 6 R124 4.99K + LM393S 3 3_3V TP42 1 Normally HIGH, active LOW VDD I187 R131 49.9K I188 3 2 U37 LT1009S Low at approx 5.85V I220 R122 150K + 5 + 6 - 8 4 U28 LM393S 7 R118 4.99K TP43 TH 2 4 5 C112 0.1U + C107 470U 16V TH 4 2 U29 PRE D I193 CLR Q 6 GND 7 11 13 3 U29 PRE D I190 I194 14 VCC Q 9 R103 49.9K I202 1 BTN_PRS_L 3 2 CLK CLR Q13 2N3904S I203 3_3V 12 I181 1 74HC74S 10 C85 0.1U R97 49.9K 2 CLK I186 R106 10.0K I189 1 I192 VCC 14 Q 5 8 Q GND 7 Q14 2N3904S I191 74HC74S 1 CLRIII 5 4 R126 10.0K CRIT_BATT-L 4 I185 C86 0.1U R120 10.0K R129 10.0K U28 TP47 LM2940H IN OUT 3 G1 CS HS 3 3_3V ONBUTTON R128 4.99K U36 3_3V R111 10.0K I183 I182 I218 GND VDD TP39 3_3V MBRS330T3 R107 200K VDD TP38 7 1 2 GNDVIA HG2 Requires Heatsink NPB #891196 CR18 1N914S Q16 3 1 SI9953 3_3V C114 0.1U C111 0.1U TP41 BATT_CHECK R125 100K RAMPWR 1 10U 16V 1 2 + 3 2 35V R115 10.0K U35 LM393S U35 LM393S 8 + C109 OUT 1 GND 1 MAIN_OUT 4 3 2 1 IN 1U R205 10.0M 3 1N914S J6 3 VC1206 5.6V 1 VDD R113 100K 100K I322 CR27 I215 R116 MBRS130 CR31 VDD R112 20.0K CR20 U33 LT1121CZ 2 3 CR28 1N914S 1 MBRS330T3 CR21 MBRS130 MAIN_OUT MAIN_DC1 Q17 2N3904S R130 10.0K LOW_BATT-L Normally HIGH, active LOW 10.0M R91 035354 Figure 11-11 UIF PCB Power Supply Schematic Diagram B 11-27 VDD VDD VDD I122 R187 4.99K MOTNLEDDR ASLEDDR 2 I285 R140 4.99K 2 1 I284 R141 4.99K BATLEDDR PSLEDDR 1 2 1 R142 4.99K 2 1 I286 I287 3 3 3 2N3906S Q19 3 2N3906S Q28 I206 R136 10.0K C89 0.1U Z5U R139 10.0K 2N3906S Q20 2 8 BK-LT-ONL I290 I123 I289 1 CR25 1N4934 2 1 CR24 Q12 1N4934 SI9933 2 1 7 TH CCFL inverter L5 100UH CCFLPWR TH + C143 + 47U 10V C142 47U 10V I288 2N3906S Q21 4 2 GND1 CXA-L10 BATLED I316 U40 9 A0 BK-LT-ONL RESETL CON_4L_098 VDD R200 8 10 A601 121 74HC32S DSPLRDL VEE 12 R/WL I319 U40 74HC32S 13 L7 16V 10U C103 121 U40 4 I145 R201 11 DSPLYCSL I325 R157 I326 6 5 74HC32S FONTSEL 121 C98 + 0.1U J9 1 3 DSPLR/WL 5 DSPLYCSL 7 9 11 BD0 13 BD2 15 BD4 17 BD6 19 Z5U 2 4 6 8 10 12 14 16 18 20 VEE DSPLRDL DSPLA0 RESETL BD1 BD3 BD5 BD7 CON_IDC20 D[15:0] TO LCD DISPLAY BDSPLYCSL BD[7:0] VDD BD0 BD1 BD2 BD3 BD4 BD5 BD6 BD7 C99 0.1U Z5U R/WL RP5 120 8 7 6 5 4 3 2 1 9 10 11 12 13 14 15 16 2 3 4 5 6 7 8 9 U39 A1 A2 A3 A4 A5 A6 A7 A8 B1 B2 B3 B4 B5 B6 B7 B8 D8 D9 D10 D11 D12 D13 D14 D15 18 17 16 15 14 13 12 11 ONBUTTON 3_3V VDD 1 DIR 19 BDSPLYCSL G I297 CR22 8 7 6 5 AC_OK 8 7 6 5 74HC245S RP8 10K J8 ACPWRLED 2 4 PSLED 6 8 10 12 14 16 ASLED 1 BATLED 3 MOTNLED5 7 9 L19 B601 SOFTKEY4 11 13 DOWN_BTN L20 B601 15 17 L21 B601 ALRMSIL CON_FLEX17 SOFTKEY2 L18 B601 CR34 L17 L15 L22 L16 B601 SOFTKEY1 B601 SOFTKEY3 B601 CNTRST B601 UP_BTN I343 I342 I341 I344 CR33 2 1 VC1206 5.6V 1 VC1206 5.6V SOFTKEY1 SOFTKEY2 SOFTKEY3 SOFTKEY4 UP_BTN DOWN_BTN CNTRST ALRMSIL PBCSL I296 AC_LED I348 I347 I346 I345 2 3 4 5 6 7 8 9 VDD ONBUTTON 1 19 1 3 I221 I214 D[15:0] U34 A1 A2 A3 A4 A5 A6 A7 A8 B1 B2 B3 B4 B5 B6 B7 B8 18 17 16 15 14 13 12 11 CR23 1 3 1N914S R143 100K R132 4.99K 1N914S RP7 10K 1 2 3 4 1 2 3 4 AC_OK AC_LED R144 10.0K R189 200K 2 1 3 1 2 Q23 2N7002S 3 2N3906S Q22 I300 I299 R145 82.5 ACPWRLED D8 D9 D10 D11 D12 D13 D14 D15 DIR G 74HC245S VDD VDD 295 MEMBRANE PANEL CONNECTOR C100 0.1U Z5U 035354 HV_OUT 5 GND2 J5 ASLED PSLED PBCSL 1 2 3 4 MOTNLED R138 249 2 3 Turn off control R133 249 R134 249 R137 249 A1 TH 1 VDD C102 0.1U Z5U Figure 11-12 Display Interface Schematic Diagram 11-29 NELLCOR PURITAN BENNETT NPB-290 MAIN BOTTOM SIDE 035351 Figure 11-13 UIF PCB Parts Locator Diagram 11-31 LINE_IN 5 8 EPS2PC3 TH 10 R2 100M 1/4W TH Power Entry R5 C5 0.1U 15000U 1.00K 1/2W 35V TH TH AC- 2ASB TH + C7 3 F2 FAC- OB24-9 TH NEUT_IN 1 R19 1.00K 1 + TH 35V 100U C9 1/4W TH Main Board R10 1.50 1/2W TH Battery Charge C11 I5 R11 10.0K 0.1U R22 10.0K R21 73.2K R20 10.0K VOUT 2 I6 + 5 + 6 - 7 2 - 3 + 8 - 4 R8 1.00K GND TP2 1 2 I8 I2 4 Q2 IRF9510 TH 3 R3 10.0K 1 2 Q6 2N7002S 1 I12 I9 CR6 Requires Heat Sink Nellcor # 891196 CR7 3 1N914S 1 1N914S R6 100K W6 R13 10.0K 1 I7 BATT_OUT W8 I4 R16 10.0K 3 R25 10.0M W9 CHG_IN 3 1 R14 10.0K R7 154K MAIN_DC 3 4 U2 LM385S I1 0.1U Q3 MPSA56 8 4 C10 2 W7 1 U1 + LM358 I3 FAN_CTRL R9 1.00K BATT_CHK 2 - TH 8 U1 LM358 C4 100P TP1 R12 10.0K VREF LM35D CR2 22V SMCJ22C R24 49.9 MAIN_DC VIN GND CR1 1N4702 15V TH FAN_CTRL TH E U3 R4 499 C8 0.01U ESD Protection 1 3 2 To Fan 1 CON_2L R23 10.0K DT1 600V 3 CR5 22V SMCJ22C 2 4 4 13 12 1 3 6 Fan Control J1 Q5 MPSA56 2 C1 220P 250V TH 2 6 I11 2 3 C6 0.01U 2ASB TH I10 MAIN_DC 1 230V SW1 2 Q1 TH 2N3904 HIGH CURRENT VIAS 1 7 9 T1 E3490A TH 1 4 R1 390K 1/2W TH 2 NEUTRAL E 115V FAC+ BR1 GBU8B TH 2 W3 C2 4700P 250V TH 15 AC+ F1 3 E 1 T2 1 W1 C3 220P 250V TH 2 LINE W2 3 Q4 2N3904 TH 1 R15 49.9K 2 CR4 SW2 MBRS330T3MTS50B TH CHG_OUT NC F3 BATT+ W4 Battery + W5 Battery - 2ASB TH BATT_CHK R17 10.0K 035799 Figure 11-14 Power Supply Schematic Diagram 11-33 035800 Figure 11-15 Power Supply Parts Locator Diagram 11-35