Download MicroRint Service Manual

MicroRint
Service Manual
060-17
Revision 1.1 May 2003
Micro Medical Limited, P.O. Box 6, Rochester, Kent ME1 2AZ
1
MicroRint Microcomputer - System Overview (Fig. 1)
The Micro Medical MicroRint is a data recording airways resistance meter consisting of the
following items:
1.
MicroRint microcomputer unit with graphic display
2.
Micro Medical interrupter transducer.
3.
2 off caps.
4.
Disposable filter.
5.
Universal mains adapter.
6.
Mouthpiece adapter.
7.
Facemask.
8.
Pressure calibration adapter.
1
F2
1
2
ABC
F3
3
MicroRint
3
F4
DEF
4 GHI
5 JKL
6 MNO
7PQRS
8TUV
/
0
9 WXYZ
.
Esc
Del
6
2
4
7
5
The MicroRint is powered by internal rechargeable Nickel Cadmium cells or by the mains adapter
supplied.
The interrupter transducer is used to measure the subject’s airways resistance in accordance with the
operating manual.
2
Microcomputer Unit
(Refer to drawings 067-01 – 067-05, 067-11, and 067-12)
The microprocessor control circuit carries out the Rint test routines, monitors the
transducer signals and keypad, and drives the display under the control of the
program module.
The drawing 067-01 is a hierarchical block diagram showing the connections of the
sub-sections. The rest of the drawings are sub-sections and are described in detail
below.
Micro controller (067-02).
U9 is a Hitachi HD64F2318 16 bit microprocessor with 256K of flash memory and 8K
of Ram. The system clock is supplied by 20MHz crystal (X2). There is also 512
Kbyte (U7) of external Ram used for running a module and storing variable data.
The internal flash is used for the boot software, kernel and the base module. The
kernel handles the low level interface to display, keyboard etc. and the base module
runs on start-up and gives a choice of which module needs to be executed.
The modules are stored in the external 8 Mbyte Flash PROM (U5). The kernel also
has a flash filing system which keeps track of all the files in the external Flash
PROM. The files can be an executable Rint module or other module data. The filing
system is similar to a PC Dos filing system.
U15 is used to control the access to the flash device.
The speaker J5 is directly connected to the Port pins and the pins are toggled at 1
KHz to generate the buzzing sound.
U9 is used for enabling the internal flash to be overwritten. If a new kernel is
downloaded, the flash is enabled and data transferred.
U10 is the reset controller, which holds the reset line low for 350 ms on power up.
This ensures that the supply has stabilised before the micro starts.
TR3 is used by the micro to hold the power supply ON whilst it is writing to the filing
system. This is to ensure that data is not corrupted when it is writing and the power
is turned off.
TR4 allows the micro to turn off the power and switch off the unit. This is normally
done when the unit is left on for a long period of time. To preserve the battery, it
turns it off.
3
Memory Map
0x000000 0x400000 0x800000
0xC00000
0xFFDC00 –
0x040000
0x480000
256K
512K
0xFFFBFF
8K
Internal Flash
External Ram for modules
Flash Prom (Single address used)
Display Controller
Internal Ram – stack.
Keypad interface (067 – 03)
The 26 keypad switches are arranged in a 5 X 5 matrix and a separate On/Off key.
When the keypad is being read by the processor the 5 columns are sequentially
driven low by the port lines PE0 – PE4. The state of the 5 rows is read by the port
P40 – P44. The diodes in the keypad PCB isolate the outputs from the Port to
ensure that a high current will not flow from an output set high to one set low if two
keys are pressed simultaneously. The ON/OFF key is connected to the power
control circuitry described in the Power Supply section.
Resistor RN1 ensures that the keys which are not pressed are read as high.
Serial interface (067-04)
The micro controller communicates with the PC or the printer via an RS232 serial
interface at 38,4 Kbits per sec baud rate, with 8 bits data, 1 stop bit and no parity.
U6 converts the RS232 signal to a logic signal of 3.3V. The micro controller has two
inbuilt serial controllers, SCI0 and SCI1. SCI0 is used for synchronous data transfer
whilst SCI1 is used in asynchronous mode for RS232.
Real Time Clock
U3 is a Xicor X1243 real time clock with 2Kbyte of EEPROM. It operates at
32.768 Khz and is powered by the lithium battery. The device requires a very small
amount of power during standby mode and as the unit will never drain the battery
out, this should be sufficient to keep the clock going for a long period of time before
recharging. The date and time can be changed from the system menu.
The interface to the clock is via an I2C bus. The micro controller does not have a
2
dedicated I C bus, so two port lines (P20 – P21) are used under software to emulate
the bus.
The EEPROM is used for storing the calibration value and other system data. If the
device is ever replaced, the unit will have to be reconfigured and recalibrated.
4
Temperature Sensor
U20 is a Dallas DS18S20 temperature sensor operating on their one wire bus
protocol. It has an accuracy of 0.5 degree centigrade. A port line P23 is used under
software to emulate the one wire bus.
The ambient temperature reading is used for adjusting inspiratory flow at ambient
temperature to respective flow at body temperature.
Transducer interface (067-05)
An SPI bus consisting of serial data in (SIN), serial data out (SOUT), and clock
signals (SCLK) is used to interface with the 12-bit analogue to digital converter in the
Rint transducer. The SEN signal activates the shutter.
Display (067-11)
The display is a high resolution custom graphic 240 by 120 dot LCD. It is controlled
by an Epson SED1335 display controller (U16) which directly interfaces to the micro
controller. The display controller timing is generated by a 10 MHz crystal (X3). U19 is
a 32K byte RAM to hold the display data.
The LCD display is based on four planes, each requiring different plane voltage. It is
biased by 22 V generated by DC-DC controller U17. VR1 varies this voltage which in
turn changes the contrast. At dark level, the bias voltage is typically 22.6V and the
plane voltages are 20.9V, 19.2V, 3.5V and 1.7V. Of course, they would be slightly
different for different contrast level. The plane voltages are generated by resistor
ratio dividers (R12, R13, R25, R14, R17) and buffered by quad Op-amps U18.
J2 is a connector to the display.
5
Power Supply (067-12)
The power to the system is either supplied by the 3.9V lithium battery or from an
external 9V DC regulated power supply. If the external supply is connected, then
TR5 is switched off and the battery is not used. R32 ensures that the battery is
trickle charged at all times.
The on/off key is conditioned via U12 and applied to set/reset D type flip flop (U11).
On every key press, the flip flop toggles between the on and off state. In the On
state, TR7 is switched on, switching on TR6. The on state can be held by MC_ONline from the micro controller whilst it is saving data in the Flash PROM. The micro
controller can also switch the power off by means of the MC_OFF- line which resets
U11.
U14 is a DC-DC converter with an input range of 0.9V to 10V and an output of 3.3
volts to power the unit. Since the range is up to 10V only, care should be taken not
to use any other external power supply, as most of them are unregulated and could
output 12V for a 9V unregulated supply.
U14 is another DC-DC converter with an output of 9V. This higher supply is used for
powering the Rint transducer.
R28 and R31 divide the unregulated voltage to a third and are applied to the A/D
converter of the micro controller. The micro controller continuously examines the
reading and gives a battery low or battery dead warning message. From the reading
the micro controller can also deduce that the external supply is connected, so it can
turn itself off if the unit is left on for a long time.
Inductors L1 and L2 are placed for EMC filtering and D5 protects the unit from
reverse polarity power supply
6
Disassembling the Interrupter Transducer for Circuit Investigation
1. Disconnect the Interrupter Transducer from the MicroRint Computer
2. Remove the three case screws and put to one side.
Micro Medical Limited
P.O. Box 6, Rochester
Kent ME1 2AZ England
Case
screws
7
3. Turn the transducer over and ease the moulding apart to reveal the circuitry:
Pressure
transducer
(pressure)
Rotary
solenoid
Pressure
transducer
(flow)
Battery
pack
4. The Interrupter Transducer is now ready for fault finding.
Reassembling Interrupter Transducer
1. Push the two mouldings together ensuring that no tubing or wires are caught between the two
mouldings.
2. Replace the three screws into the moulding and secure
3. The unit will now require calibration – Refer to operating manual.
8
Circuit Description – Interrupter Transducer
(Refer to Drawing 060-01)
Overview
During measurement the interrupt transducer monitors tidal flow and provides for a means of
momentary airways occlusion during which time the pressure at the mouth is measured.
The flow is measured by monitoring the pressure across a resistive element using a high frequency
silicon solid-state sensor.
Occlusion is provided by a fast acting rotary solenoid attached to a shutter. During occlusion a second
sensor is used to monitor the pressure developed at the mouth.
Power supply
9-volt power is supplied to the transducer from the microcomputer unit at pin 2 of connector J1.
The 9-volt power is regulated down to 5 volts (VCC) by the linear voltage regulator (U4) that provides
power for the logic and sensor circuits. A rechargeable 6-volt Ni-cad battery pack supplies the power
to the rotary solenoid. The battery pack is trickle charged from the 9V supply by the constant current
generated by the current mirror formed by R26, R27, R5, and TR7.
Battery monitor
With the transducer connected to the microcomputer unit, TR5 is saturated as current will pass into its
base connection through R16, which is connected to the incoming 9-volt supply. TR5 connects the
resistor divider formed by R3 and R4. The output of the divider is connected to channels 2 and 3 of
the 12 bit A/D converter, U3, and is read by the microcomputer unit to monitor the battery voltage.
TR5 turning off when the incoming 9-volt supply is not present ensures that the battery is not
discharged when the transducer is not in use.
Flow measurement
The flow through the transducer is measured by monitoring the pressure drop across the internal
resistive element consisting of a stainless steel mesh in a plastic holder.
The pressure transducer, U5, contains a piezo-resistive bridge, whose differential output is amplified
by the instrumentation amplifier, U1. The reference for U1, pin 5, is 1.24 volts derived from the 5 volt
supply by R7 and R12 and buffered by U7. The output of U1 will thus be centred on 1.24 volts. This
voltage is also applied to REFADJ pin of the A/D converter, U3, and gives the A/D converter a full
scale input voltage of 2.48 volts. The offset of U5 is nulled using the potentiometer, VR2, to give 1.24
volts at the output of U1 with no flow applied.
The output from U1 is filtered by R19 and C10 and applied to the analogue input, CH0, of the A/D.
The microcomputer unit communicates with the A/D converter using the DIN and DOUT lines
synchronously with the serial clock, SCLK. DOUT from the A/D converter is inverted by TR6 to obtain
the correct polarity.
9
Pressure measurement
The pressure transducer, U6, measures the pressure at the mouth. U6 contains a piezo-resistive
bridge, whose differential output is amplified by the instrumentation amplifier, U2. The reference for
U2, pin 5, is 1.24 volts derived from the 5 volt supply by R7 and R12 and buffered by U7. The output
of U2 will thus be centred on 1.24 volts. This voltage is also applied to REFADJ pin of the A/D
converter, U3, and gives the A/D converter a full scale input voltage of 2.48 volts. The offset of U6 is
nulled using the potentiometer, VR1, to give 1.24 volts at the output of U2 with no flow applied.
The output from U2 is filtered by R18 and C9 and applied to the analogue input, CH1, of the A/D. The
microcomputer unit communicates with the A/D converter using the DIN and DOUT lines
synchronously with the serial clock, SCLK. DOUT from the A/D converter is inverted by TR6 to obtain
the correct polarity.
Shutter Operation
The shutter is closed when the shutter solenoid is energised. This happens when the trigger input at
pin 5 of J1 is taken high by the microcomputer unit. When the valve is de-energised the shutter
returns to the open position by the action of the internal spring on the solenoid.
The power for the solenoid is taken from the internal 6 volt ni-cad rechargeable battery pack, BAT1.
When the trigger input is taken high TR4 is turned on and a pulse, generated through the action of C1
and R8, is applied to the trigger input of a timer, U8. The timer is set by R9 and C3 to supply a 10ms
positive pulse at the output, pin3. This pulse will turn on TR2 and TR3 and apply the full battery
voltage to the solenoid to ensure rapid closure. In normal operation the solenoid is energised for
100ms. The holding current is supplied through TR1 and R11 and is supplied as long as the trigger
input at pin 5 of J1 is high.
The trigger input is also fed to the jack socket J3 which is used when the transducer is connected to
the external suction device used for the negative expiratory pressure test, NEP.
10
Drawing No.
067-00
Revision No. 1.3
Designation
Part No.
Date 12/07/02
Page: 1 OF 3
Description.
U1
U2
U3
U4
U5
U6
U7
U8
U9
U10
U11
U12
U13
U14
U15
U16
U17
U18
U19
U20
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
R13
R14
R15
R16
R17
R18
R19
R20
R21
R22
R23
R24
R25
R26
Rohm individual CMOS Schmitt invertor, SOT23-5 package
Rohm individual CMOS Schmitt invertor, SOT23-5 package
Xicor clock calander with 256 X 8 bit RAM, SO-8 package
Maxim SPDT analogue switch, SOT23-6 package
Samsung 8M X 8 bit FLASH memory, TSOP44/40 package
Maxim RS232 transceiver, SSOP16 package
Samsung 512k X 8 bit CMOS static RAM, SOL32/525 package
Rohm individual CMOS gate, SOT23-5 package
Hitachi H8S/2318 microcontroller, TQFP100 package
Maxim power monitor, SOT23-5 package
CMOS Dual D Type flip flop, SO-14 package
CMOS Quad NAND Schmitt input gate, SO-14 package
Linear Technology DC/DC convertor, SOT23-5 package
Linear Technology DC/DC convertor, SOT23-5 package
Quad 2-input OR gate
Display driver
Linear Technology DC/DC convertor, SOT23-5 package
Quad surface mount op-amp
Gold Star 32K X 8 bit CMOS static RAM, 28 pin SOP package
Dallas semiconductor digital thermometer, TO-92B package
4.7K resistor 1%, 0805 package
4.7K resistor 1%, 0805 package
4.7K resistor 1%, 0805 package
100K resistor 1%, 0805 package
10M resistor 5%, 0805 package
100K resistor 1%, 0805 package
100K resistor 1%, 0805 package
220K resistor 1%, 0805 package
100K resistor 1%, 0805 package
10K resistor 1%, 0805 package
4.7K resistor 1%, 0805 package
10K resistor 1%, 0805 package
10K resistor 1%, 0805 package
10K resistor 1%, 0805 package
100K resistor 1%, 0805 package
100K resistor 1%, 0805 package
10K resistor 1%, 0805 package
10K resistor 1%, 0805 package
100K resistor 1%, 0805 package
100K resistor 1%, 0805 package
10 ohm resistor 1%, 0805 package
1K resistor 1%, 0805 package
150K resistor 1%, 0805 package
68K resistor 1%, 0805 package
91K resistor 1%, 0805 package
100 ohm resistor 1%, 0805 package
BU4S584
BU4S584
X1243S8
MAX4544EUT-T
K9F6408U0A-TCB0
MAX3221CAE
K6T4008V1C-BB70
BU4S11
HD64F2318VTE25
MAX824TEXK-T
4013
4093
LT1613CS5
LT1613CS5
74LCX32
SED1335FOB
LT1613CS5
LM324
GM76C256CLLFW-55-T/R
DS18S20
11
Parts List For: MicroLoop MK6
Drawing No.
067-00
Revision No. 1.3
Designation
Part No.
R27
R28
R29
R30
R31
R32
337-729 (F)
R33
R34
R35
R36
R37
R38
RN1
107-048 (F)
VR1
T18 S/I S/B S/T 20KA
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
197-324 (F)
C11
C12
C13
C14
C15
C16
C17
C18
C19
C20
C21
C22
C23
197-324 (F)
C24
C25
C26
301-8544 (F)
C27
301-8544 (F)
C28
301-8544 (F)
C29
C30
C31
301-7000 (F)
C32
C33
301-8593 (F)
C34
301-8544 (F)
Date 12/07/02
Page: 2 OF 3
Description.
82K resistor 1%, 0805 package
200K resistor 1%, 0805 package
39K resistor 1%, 0805 package
13K resistor 1%, 0805 package
100K resistor 1%, 0805 package
82 ohm 1 watt resistor, axial package
100K resistor 1%, 0805 package
100K resistor 1%, 0805 package
10K resistor 1%, 0805 package
10K resistor 1%, 0805 package
1K resistor 1%, 0805 package
1K resistor 1%, 0805 package
6 pin, 5 commoned 100K SIL network
Piher 20K linear potentiometer
22pF Philips or AVX ceramic, 0805 package
47pF Philips or AVX ceramic, 0805 package
1nF Philips or AVX ceramic, 0805 package
1nF Philips or AVX ceramic, 0805 package
100nF Philips or AVX ceramic, X7R dielectric, 0805 package
100nF Philips or AVX ceramic, X7R dielectric, 0805 package
100nF Philips or AVX ceramic, X7R dielectric, 0805 package
100nF Philips or AVX ceramic, X7R dielectric, 0805 package
100nF Philips or AVX ceramic, X7R dielectric, 0805 package
47uF/16v Surface mount Tantalum
100nF Philips or AVX ceramic, X7R dielectric, 0805 package
100nF Philips or AVX ceramic, X7R dielectric, 0805 package
100nF Philips or AVX ceramic, X7R dielectric, 0805 package
100nF Philips or AVX ceramic, X7R dielectric, 0805 package
100nF Philips or AVX ceramic, X7R dielectric, 0805 package
100nF Philips or AVX ceramic, X7R dielectric, 0805 package
33pF Philips or AVX ceramic, X7R dielectric, 0805 package
100nF Philips or AVX ceramic, X7R dielectric, 0805 package
33pF Philips or AVX ceramic, X7R dielectric, 0805 package
100nF Philips or AVX ceramic, X7R dielectric, 0805 package
100nF Philips or AVX ceramic, X7R dielectric, 0805 package
1uF Philips or AVX ceramic, X7R dielectric, 0805 package
47uF/16v Surface mount Tantalum
1uF Philips or AVX ceramic, X7R dielectric, 0805 package
100nF Philips or AVX ceramic, 0805 package
33uF/16v Surface mount Tantalum
33uF/16v Surface mount Tantalum
33uF/16v Surface mount Tantalum
100nF Philips or AVX ceramic, 0805 package
100nF Philips or AVX ceramic, 0805 package
100uF/16v
100nF Philips or AVX ceramic, 0805 package
47uF/25v Surface mount Tantalum
33uF/16v Surface mount Tantalum
12
Parts List For: MicroLoop MK6
Drawing No.
067-00
Revision No. 1.3
Designation
Part No.
C35
C36
C37
C38
C39
C40
C41
C42
C43
TR1
DTB113EK
TR2
DTC114EK
TR3
DTC114EK
TR4
DTC114EK
TR5
ZXM62P02E6
TR6
ZXM62P02E6
TR7
FMMT491
D1
ZHCS1000
D2
ZHCS1000
D3
ZHCS1000
D4
ZHCS1000
D5
ZHCS1000
D6
U1JC44
D7
ZHCS1000
L1
NLFC453232-3R3M
L2
NLFC453232-3R3M
L3
353-1340 (F)
L4
353-1340 (F)
L5
353-1340 (F)
L6
353-1340 (F)
F1
MICROSMD035-2
DISPLAY
LTA75R227J
J1
95001-2661
J2
18FMN-BMTTN-TF
J3
MDS4
J4
14FMN-BMTTN-TF
J5
J6
J7
BAT1
B2B-PH-K-S
SPKR
PKM35-4A0
X1
571-672 (F)
X2
X3
485-081 (F)
067-09
067-15
067-13
Date 12/07/02
Page: 3 OF 3
Description.
10pF Philips or AVX ceramic, 0805 package
10pF Philips or AVX ceramic, 0805 package
100nF Philips or AVX ceramic, 0805 package
1uF Philips or AVX ceramic, X7R dielectric, 0805 package
1uF Philips or AVX ceramic, X7R dielectric, 0805 package
1uF Philips or AVX ceramic, X7R dielectric, 0805 package
1uF Philips or AVX ceramic, X7R dielectric, 0805 package
1uF Philips or AVX ceramic, X7R dielectric, 0805 package
1uF Philips or AVX ceramic, X7R dielectric, 0805 package
Rohm PNP digital transistor, SOT-23 package
Rohm NPN digital transistor, SOT-23 package
Rohm NPN digital transistor, SOT-23 package
Rohm NPN digital transistor, SOT-23 package
P channel MOSFET SOT23-6 package
P channel MOSFET SOT23-6 package
Zetex NPN Transistor SOT-23 package
Zetex Schottky diode, SOT-23 package
Zetex Schottky diode, SOT-23 package
Zetex Schottky diode, SOT-23 package
Zetex Schottky diode, SOT-23 package
Zetex Schottky diode, SOT-23 package
Toshiba 1A diode
Zetex Schottky diode, SOT-23 package
3.3uH inductor, 1210 package
3.3uH inductor, 1210 package
22uH inductor, 1210 package
22uH inductor, 1210 package
22uH inductor, 1210 package
22uH inductor, 1210 package
Tyco 700mA Polyswitch
Nan Ya 240 X 160 graphic display
Molex 6 way data socket
18 way 1mm pitch cable connector from JST
4 way mini DIN socket
14 way 1mm pitch cable connector from JST
2 way 0.1" pitch pin header
2.5mm DC power socket from G.English
3 way 0.1" pitch pin header
2 way PCB socket from JST
Murata piezo ceramic sounder
32.768 KHz crystal, WATCH package
20MHz crystal, HC49/4H package
10MHz crystal
Sanyo NI CAD battery pack
M1.7 X 3mm screw
M1.7 plain washer
14 way ribbon cable for keypad
PCB Iss 1
13
Parts List - Interrupter Transducer
Designation
U1
U2
U3
U4
U5
U6
U7
U8
TR1
TR2
TR3
TR4
TR5
TR6
TR7
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
R13
R14
R15
R16
R17
R18
R19
R20
R21
R22
R23
R24
R25
R26
R27
R28
R29
C1
C2
C3
Description
(AD623ARM) INSTRUMENTATION AMPLIFIER
(AD623ARM) INSTRUMENTATION AMPLIFIER
(MAX1247BCEE) SERIAL 12 BIT A/D CONVERTER
(LM2931M-5.0) LOW DROP OUT 5 VOLT REGULATOR
(SDXL005D4) 5” DIFFERENTIAL PRESSURE TRANSDUCER
(SDXL005D4) 5” DIFFERENTIAL PRESSURE TRANSDUCER
(MAX4241EUA) OP-AMP
(LM555CM) TIMER
(FMMT717) PNP TRANSISTOR
(FMMT617) NPN TRANSISTOR
(FMMT717) PNP TRANSISTOR
(FMMT617) NPN TRANSISTOR
(FMMT617) NPN TRANSISTOR
(DMMBT2369LT1) HIGH SPEED SWITCHING NPN TRANSISTOR
(BCV62C) MATCHED PNP TRANSISTOR PAIR
390 OHM SURFACE MOUNT RESISTOR 0.125 WATT 5% SIZE 0805
820 OHM SURFACE MOUNT RESISTOR 0.125 WATT 5% SIZE 0805
100K SURFACE MOUNT RESISTOR 0.125 WATT 5% SIZE 0805
33K SURFACE MOUNT RESISTOR 0.125 WATT 5% SIZE 0805
39 OHM SURFACE MOUNT RESISTOR 0.125 WATT 5% SIZE 0805
390 OHM SURFACE MOUNT RESISTOR 0.125 WATT 5% SIZE 0805
100K SURFACE MOUNT RESISTOR 0.125 WATT 5% SIZE 0805
10K SURFACE MOUNT RESISTOR 0.125 WATT 5% SIZE 0805
120K SURFACE MOUNT RESISTOR 0.125 WATT 5% SIZE 0805
150 OHM SURFACE MOUNT RESISTOR 0.125 WATT 5% SIZE 0805
3.9 OHM 1 WATT 5% RESISTOR
33K SURFACE MOUNT RESISTOR 0.125 WATT 5% SIZE 0805
390 OHM SURFACE MOUNT RESISTOR 0.125 WATT 5% SIZE 0805
10K SURFACE MOUNT RESISTOR 0.125 WATT 1% SIZE 0805
47 OHM SURFACE MOUNT RESISTOR 0.125 WATT 1% SIZE 0805
1M SURFACE MOUNT RESISTOR 0.125 WATT 1% SIZE 0805
470 OHM SURFACE MOUNT RESISTOR 0.125 WATT 1% SIZE 0805
15K SURFACE MOUNT RESISTOR 0.125 WATT 1% SIZE 0805
150K SURFACE MOUNT RESISTOR 0.125 WATT 1% SIZE 0805
1K SURFACE MOUNT RESISTOR 0.125 WATT 1% SIZE 0805
1K SURFACE MOUNT RESISTOR 0.125 WATT 1% SIZE 0805
1M SURFACE MOUNT RESISTOR 0.125 WATT 1% SIZE 0805
1.5K SURFACE MOUNT RESISTOR 0.125 WATT 1% SIZE 0805
1M SURFACE MOUNT RESISTOR 0.125 WATT 1% SIZE 0805
1M SURFACE MOUNT RESISTOR 0.125 WATT 5% SIZE 0805
33 OHM SURFACE MOUNT RESISTOR 0.125 WATT 5% SIZE 0805
33 OHM SURFACE MOUNT RESISTOR 0.125 WATT 5% SIZE 0805
100 OHM SURFACE MOUNT RESISTOR 0.125 WATT 5% SIZE 0805
1K SURFACE MOUNT RESISTOR 0.125 WATT 5% SIZE 0805
100nF MULTILAYER CERAMIC CAPACITOR SIZE 0805
100nF MULTILAYER CERAMIC CAPACITOR SIZE 0805
100nF MULTILAYER CERAMIC CAPACITOR SIZE 0805
14
C4
C5
C6
C7
C8
C9
C10
D1
D2
D3
D4
BAT
J1
J2
47uF ELECTROLYTIC CAPACITOR SIZE UWX6.3
47uF ELECTROLYTIC CAPACITOR SIZE UWX6.3
10nF MULTILAYER CERAMIC CAPACITOR SIZE 0805
100nF MULTILAYER CERAMIC CAPACITOR SIZE 0805
100nF MULTILAYER CERAMIC CAPACITOR SIZE 0805
10nF MULTILAYER CERAMIC CAPACITOR SIZE 0805
10nF MULTILAYER CERAMIC CAPACITOR SIZE 0805
LOW CURRENT YELLOW 3mm LED
(BAS19) GENERAL PURPOSE SMALL SIGNAL DIODE
(BAS19) GENERAL PURPOSE SMALL SIGNAL DIODE
(BAS19) GENERAL PURPOSE SMALL SIGNAL DIODE
5 x 1/3AA SIZE 110mA-hr SANYO BATTERY PACK
6 WAY PIN HEADER
(GDAY 025 X20 B25) EMMESEM ROTARY SOLENOID 6.8V 7% DUTY 1.25 OHMS 65 DEG
15
Fault Analysis
The following analysis is only a guideline and should be carried out in a logical sequence. If the fault is
still apparent after the following suggestions then the unit should be fault found using the circuit
descriptions and circuit diagrams provided.
When the unit is turned on there is no display present
-Rotate contrast thumb wheel anti-clockwise to see if screen darkens.
-Connect charger to see if screen darkens and charging light illuminates.
When the unit is turned on the display is dark purple
-Rotate contrast thumb wheel clockwise to see if screen colour becomes lighter and characters are
displayed.
-Connect charger to see if screen characters appear.
The recorded values are low
-Ensure that the unit is calibrated – Refer to operating manual.
-Ensure that the mouthpiece holder is fully inserted into the interrupter transducer unit.
-Check that the resistive element is not damaged.
-Check that there are no leaks in the patient circuit. If a mouthpiece is used, then check that there are
no leaks around the patient’s mouth and that a nose-clip has been used. If a facemask is used then
check that it is held firmly against the face.
The shutter does not activate
-Check that the battery low message is not displayed on the LCD display
-Ensure that the interrupter transducer is connected to the microcomputer unit.
Technical Support
Great Britain and World Headquarters
Micro Medical Ltd
PO Box 6
Rochester
Kent ME1 2AZ
Telephone + 44 (0)1634 360044
Fax
+44 (0)1634 360055
Web Site http://www.micromedical.com.uk
Email
[email protected]
Contact Micro Medical Ltd for the local agent in your region or country for local service:
16
2
3
4
BAT_MON
MC_ONSENDIR
MC_OFF-
RESET-
D[0..7]
RDWRA0
DISP_CS-
6
5
KEYIN[0..4]
KEYOUT[0..4]
17
D[0..7]
KEYIN[0..4]
KEYOUT[0..4]
5
ON/OFF_KEY
MC_ONSENDIR
MC_OFFTCLK
RTC_ONBAT_MON TD
Power Supply
power.sch
RESET-
D[0..7]
RDWRA0
DISP_CS-
DISPLAY
display.sch
ON/OFF_KEY
KEYIN[0..4]
KEYOUT[0..4]
KEYPAD
KEYPAD.sch
5
6
6
Title
MicroLoop - circuit overview
7
Sheet of
Drawn By:
Revision
8
C
D
Date:
File:
A3
Size
067-01
7
6-Nov-2002
H:\TEMP\067-01.sch
Number
8
D.E.COCKS
1.0
A
RX
TX
MODE
TEMP_IO
RTC_DATA
RTC_CLK
SENSIN
SCLK
SOUT
SOUT_EN-
SENSIN
SCLK
SOUT
SOUT_ENTD
TCLK
RX
TX
MODE
TEMP_IO
RTC_DATA
RTC_CLK
RTC_ON-
SEN1
SEN2
SEN_EN
SEN1
SEN2
SEN_EN
micro
MICRO.sch
4
A
RS232
serial.sch
Sensors
sensor.sch
3
B
1
2
B
C
D
1
A
B
C
MODE
1
VCC
VCC
R19
100K
VCC
BU4S11
1
C20
U8
0.1UF
+ C10
47UF/10V
VCC
3
5
R20
100K
VCC
1
2
3
CON3
J7
C15
0.1UF
2
4
5
RES
2
C18
0.1UF
BAT_MON
KEYOUT[0..4]
SOUT_EN-
SEN-
SEN_EN
SEN1
SENDIR
TEMP_IO
RTC_DATA
RTC_CLK
TX
RX
SOUT
SIN
SCLK
MAX824_EUKT
GND
RES
R9
100K
U10
VCC
WDI
2
VCC
C9
0.1UF
1 RESET-
3
C6
0.1UF
10R
R21
33pF
C16
0.1UF
VCC
KEYOUT[0..4]
VCC
C19
3
KEYOUT0
KEYOUT1
KEYOUT2
KEYOUT3
KEYOUT4
X2
20MHz
C21
0.1UF
3
87
78
77
79
80
81
82
83
84
85
86
54
55
56
59
89
90
91
92
3
4
5
6
9
11
13
8
10
12
57
58
61
60
66
67
62
64
63
33pF
C17
HD64F2318VTE25
AVSS
VREF
AVCC
P40/AN0
P41/AN1
P42/AN2
P43/AN3
P44/AN4
P45/AN5
P46/AN6/DA0
P47/AN7/DA1
P20/TIOCA3
P21/TIOCB3
P22/TIOCC3/TMRI0
P23/TIOCD3/TMCI0
P24/TIOCA4/TMRI1
P25/TIOCB4/TMCI1
P26/TIOCA5/TMO0
P27/TIOCB5/TMO1
P14/TIOCA1
P15/TIOCB1/TCLKC
P16/TIOCA2
P17/TIOCB2/TCLKD
P31/TXD1
P33/RXD1
P35/SCK1/IRQ5
P30/TXD0
P32/RXD0
P34/SCK0/IRQ4
MD0
MD1
MD2
FWE
XTAL
EXTAL
RES
STBY
NMI
U9
4
4
PG4/CS0
PG3/CS1/CS7
PG2/CS2
PG1/CS3/IRQ7/CS6
PG0/IRQ6
PF7/CLK
PF6/AS
PF5/RD
PF4/HWR
PF3/LWR/IRQ3
PF2/WAIT/IRQ2
PF1/IRQ1/CS5
PF0/IRQ0/CS4
P10/A20
P11/A21
P12/A22
P13/A23
PA0/A16
PA1/A17
PA2/A18
PA3/A19
PB0/A8
PB1/A9
PB2/A10
PB3/A11
PB4/A12
PB5/A13
PB6/A14
PB7/A15
PC0/A0
PC1/A1
PC2/A2
PC3/A3
PC4/A4
PC5/A5
PC6/A6
PC7/A7
PD0/D8
PD1/D9
PD2/D10
PD3/D11
PD4/D12
PD5/D13
PD6/D14
PD7/D15
PE0/D0
PE1/D1
PE2/D2
PE3/D3
PE4/D4
PE5/D5
PE6/D6
PE7/D7
A16
A17
A18
50
51
52
53
18
97
96
95
94
93
69
70
71
72
73
74
75
76
VCC
100K
R7
R22 1K0 1
2
A8
A9
A10
A11
A12
A13
A14
A15
41
42
43
44
45
46
47
48
99
100
1
2
A0
A1
A2
A3
A4
A5
A6
A7
D0
D1
D2
D3
D4
D5
D6
D7
KEYIN0
KEYIN1
KEYIN2
KEYIN3
KEYIN4
M_ON_KEY
M_OFF_KEY
32
33
34
35
36
37
38
39
23
24
25
26
27
28
29
30
14
15
16
17
19
20
21
22
J5
5
BUZZER
5
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
40
42
4
5
43
2
3
24
29
22
12
11
10
9
8
7
6
5
27
26
23
25
4
28
3
31
2
30
1
D0
D1
D2
D3
D4
D5
D6
D7
R/B
D0
D1
D2
D3
D4
D5
D6
D7
10
9
5
4
6
74LCX32
U15C
74LCX32
U15B
K9F6408U0B-TCB0
SE
RE
WE
WP
CE
CLE
ALE
U5
U7
KM68V4000BLT-7L
OE
WE
CS1
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
VCC
6
32
VCC
D
1
2
4
41
18
19
20
21
24
25
26
27
13
14
15
17
18
19
20
21
8
6
D0
D1
D2
D3
D4
D5
D6
D7
D0
D1
D2
D3
D4
D5
D6
D7
Date:
File:
A3
Size
Title
KEYIN[0..4]
M_OFF_KEY
7
3
11
DISP_CS-
RDWR-
RESET-
D[0..7]
A0
1
1
067-02
Sheet of
Drawn By:
MicroLoop - Processor section
74LCX32
74LCX32
U15A
6-Nov-2002
H:\TEMP\067-02.sch
Number
2
1
13
KEYIN[0..4]
M_ON_KEY
U15D
D[0..7]
12
7
3
2
3
2
8
D.E.COCKS
1.0
Revision
TR4
DTC114EK
MC_OFF-
TR3
DTC114EK
MC_ON-
8
A
B
C
D
2
3
VCC
RN1
100K-RN
KEYIN4
KEYIN3
KEYIN2
KEYIN1
KEYIN0
4
6
KEYOUT4
19
9V
8
1
2
3
4
10
KEYOUT3
12
KEYOUT1
KEYOUT2
14
KEYOUT0
13
11
9
7
5
5
5
3
J4
ON
F1
9
6
2
OFF
F2
8
5
1
F4
-
.
0
KEYPAD-ML3
F3
7
4
ESC
ENTER
DEL
6
6
Title
MicroLoop - keypad interface
7
Sheet of
Drawn By:
Revision
8
1.0
C
D
Date:
File:
A3
Size
067-03
7
6-Nov-2002
H:\TEMP\067-03.sch
Number
8
D.E.COCKS
A
KEYOUT[0..4]
KEYIN[0..4]
4
A
ON/OFF_KEY
KEYOUT[0..4]
KEYIN[0..4]
3
B
1
2
B
C
D
1
1
2
3
4
5
6
A
B
C
1
MODE
2
2
3
VCC
J3
MINI_DIN_4
1
2
3
4
3
3
4
1
5
2
24LC32AT
A0 VCC
A1
WP
A2
SCL
VSS SDA
U21
RTC_DATA
RTC_CLK
8
7
6
5
C12
0.1UF
VCC
R11
10K
VCC
VCC
5
RTC_DATA
3
6
4
VCC
2
4
3
1
VCC
12
RTC_CLK
R8
10K
0.1UF
C11
8
13
4
20
VSS
INT
VDD
32.768KHz
X1
C2+
C2 V-
FOFF
INVALID
T1 IN
R1 OUT
TTL
PCF8583T
SDA
SCL
A0
U3
C1
15pF
MAX3221CAE
C1+
C1 V+
FON
EN
RS232
T1OUT
R1IN
U6
1
OSCI
D
1
2
OSCO
8
4
7
9
5
6
7
16
10
11
VCC
5
C14
0.1UF
0.1UF
C13
5
C22
0.1UF
VBAT
R18
10K
VCC
VCC
TX
RX
C8
0.1UF
6
TX
RX
6
TEMP_IO
Title
Date:
File:
A3
Size
1
2
3
VCC
DS18S20
VDD
DQ
GND
U20
7
19-May-2003
H:\TEMP\067-04.sch
Number
067-04
Sheet 6of
Drawn By:
8
8
8
D.E.COCKS
Revision
MICROLOOP RS232 INTERFACE AND RTC
Temperature Sensor
R3
4.7K
VCC
7
1.1
A
B
C
D
A
B
C
1
2
SOUT
SOUT_EN-
SIN
SEN_EN
TD
TCLK
SEN1
SEN-
SCLK
1
3
2
TR2
DTC114EK
1
3
R4
100K
VCC
TR1
DTB113EK
V9INT
R15
100K
VCC
3
2
3
9V
2
3
D1
ZHCS1000
4
4
BU4S584
4
BU4S584
4
VCC
5
VCC
3
5
U2
U1
21
3
2
2
1
2
1
1
R2
4K7
R1
4K7
VCC
C4
1NF
C3
1NF
5
5
2
3
D
1
4
6
5
U4
MAX4544EUT-T
R16
100K
VCC
6
6
RJ11
1
2
3
4
5
6
J1
Date:
File:
A3
Size
Title
067-05
7
6-Nov-2002
H:\TEMP\067-05.sch
Number
MICROLOOP TRANDSDUCER INTERFACE
7
Sheet of
Drawn By:
8
D.E.COCKS
Revision
8
1.1
A
B
C
D
A
B
C
1
2
C34
33UF/16V
VPWR
2
+
4
5
22uH
L6
on
Vin
U17
D[0..7]
Fb
SW
3
1
D[0..7]
3
R10
10K
3
R23150K
1
1
SEL 2
SEL 1
VDD
XD0
XD1
XD2
XD3
CS
VD7
VD6
VD5
VD4
VD3
VD2
VD1
VD0
D7
D6
D5
D4
D3
D2
D1
D0
RW
VWR
VR1
20K + C33
47UF/25V
3
10MHz
X3
4
SED1335F
D2 ZHCS1000 VEE
3
15
16
21
33
32
31
30
19
XD0
XD1
XD2
XD3
VCC
42
43
44
45
46
47
48
49
VD7
VD6
VD5
VD4
VD3
VD2
VD1
VD0
DISP_CS-
29
28
27
26
25
24
23
22
D7
D6
D5
D4
D3
D2
D1
D0
WR-
7
14
10pF
C35
XG
18
XD
17
N/C
12
N/C
60
VSS
4
36
20
50
51
52
53
54
55
56
57
58
59
1
2
3
4
5
6
8
9
10
34
13
35
37
38
39
40
41
C7
0.1uF
U16
VCC
A0
VA15
VA14
VA13
VA12
VA11
VA10
VA9
VA8
VA7
VA6
VA5
VA4
VA3
VA2
VA1
VA0
VCE
VRD
RES
XECL
RD
XSCL
LP
WF
YDIS
YD
YSCL
10pF
C36
N/C
11
D
1
Gnd
2
22
C37
0.1uF
A0
VA14
VA13
VA12
VA11
VA10
VA9
VA8
VA7
VA6
VA5
VA4
VA3
VA2
VA1
VA0
RD-
RESET-
C42
1uF
10
9
5
6
3
2
5
R17
10K
12
R14
10K 13
R25
91K
R13
10K
R12
10K
5
+
-
+
-
+
-
+
-
11
4
14
LM324
U18D
8
LM324
U18C
7
LM324
U18B
1
LM324
U18A
C38
1uF
VEE
C39
1uF
C40
1uF
6
6
C41
1uF
VA0
VA1
VA2
VA3
VA4
VA5
VA6
VA7
VA8
VA9
VA10
VA11
VA12
VA13
VA14
VCC
20
27
22
28
10
9
8
7
6
5
4
3
25
24
21
23
2
26
1
VCC
KM62256D
CS
WE
OE
VCC
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
U19
GND
D0
D1
D2
D3
D4
D5
D6
D7
VCC
14
11
12
13
15
16
17
18
19
7
VD0
VD1
VD2
VD3
VD4
VD5
VD6
VD7
XD3
XD2
XD1
XD0
Date:
File:
A3
Size
Title
J2
CON18
067-11
7
6-Nov-2002
H:\TEMP\067-11.sch
Number
MicroLoop - display driver
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
8
Sheet of
Drawn By: D.E.COCKS
1.0
Revision
8
A
B
C
D
A
B
C
D
POWER
1
MC_OFF-
ON/OFF_KEY
MC_ON-
BAT1
BAT3.9V
BATTERY
MICROSMD035-2
2
1
J6
9
8
U12C
VBAT
D6
U1JC44
F1
1
2
1uF
C43
CD4093E
100R
R26
L2
3.3uH
3.3uH
L1
10
R38
1K
2
R34
100K
C32
0.1UF
2
D7
R33
100K
2
1
R6
100K
4093
U12A
C29
0.1UF
R35
10K
ZHCS1000
9V
3
2
1
2
13
12
6
5
4093
U12D
3
4093
U12B
ZHCS1000
D5
14
7
3
5
3
CLK
D
4
3
3
11
Q
Q
6
S
14
VCC
GND
7
R
4
4013
2
U11A
1
TD
1K
R37
R36
10K
TCLK
TR5
ZXM62P02E6
82R
R32
9
11
1
CLK
D
Q
4
Q
R31
100K
4013
12
U11B
13
TR7
FMMT491
TR6
ZXM62P02E6
4
3
2
Battery Charger
REGULATED
POWER SUPPLY
9.0V
8
S
R
10
R28
200K
23
SENDIR
C25
0.1UF
+ C31
100UF/16V
VPWR
5
C30
0.1UF
5
BAT_MON
C27
33UF/16V
6
C28
33UF/16V
6
+
+
4
5
4
5
on
Vin
U14
22uH
L4
on
Vin
U13
22uH
L3
Gnd
2
Gnd
2
3
1
R30
13K
1
Fb
SW
Date:
File:
A3
Size
Title
R29
39K
1uF
C24
Number
067-12
7
6-Nov-2002
H:\TEMP\067-12.sch
TP3
GND
VSS
Sheet of
Drawn By:
TP2
GND
+ C23
47UF/10V
VDD VCC
1.1
Revision
8
8
D.E.COCKS
V9INT
+ C26
33UF/16V
ZHCS1000
3
82K
R24 68K
D3
L5
22uH
1
R27
D4 ZHCS1000
3
MICROLOOP POWER SUPPLY
BAT_MON
3
1
SEPIC CONVERTER (0.9 - 10V)
Fb
SW
SEPIC CONVERTER (0.9 - 10V)
7
TP1
GND
A
B
C
D
A
B
C
TR6
R21
1K
VCC
VCC
OUT+
OUT-
6
5
4
3
2
1
4
6
4
6
1
R20
1
BAS19
1K
R22
1MEG
U5
U6
MMBT2369A
CON6
J1
SDX005IND4
SDX005IND4
OUT+
OUT-
R13
390R
D4
R25
1M
R24
1M
R23
1.5K
VR2
100K
VCC
VR1
100K
VCC
VCC
-
+
-
+
VCC
8
14
12
16
15
13
7
6
6
R1
330R
R29
1K
REFADJ
COM
CH0
CH1
CH2
CH3
VCC
2
TP3
TP4
U3
9
6
2
3
4
5
C10
0.01uF
AD623
U1
R2
680R
AD623
U2
VREF
DIN
DOUT
SCLK
CS
SSTRB
SHDN
MAX1247BCEE
2
3
2
3
VCC
7
4
2
5
2
5
3
1
3
1
5
1
8
5
1
8
7
4
1
R19
150k
R18
15k
TR4
FMMT617
R10
150R
1
R16
1M
C9
0.01uF
2
R5
680R
10K
R14
1
TR5
FMMT617
3
TR7 BCV62C
R27
33R
J3
JACK
3
R4
33K
R3
100K
8
+ C4
47uF
C6
01uF
D2
BAS19
R26
33R
VCC
C8
01uF
1
24
J2
SOLENOID
BAT1
BAT6V
TR1
FMMT717
D1
LED
R6
390R
R11
3R9
1
VCC
SOLENOID
VOUT
VIN
U4
LM2931M-5.0
C7
01uF
2
3
VCC
4
1
6
7
D
3
2
1
3
3
1
2
3
3
3
2
1
VDD
DGND
11
AGND
10
1
2
4
R12
33K
R7
100K
D3
BAS19
+ C5
47uF
4
2
3
VCC
7
U7
6
VCC
MAX4241EUA
C1
01uF
R8
10K
VCC
4
2
3
2
2
3
1
2
4
3
2
1
5
CONT
Size
Title
Date:
File:
B
VCC
THRES
LM555CM
RES
O/P
TRIG
DISCH
470R
R17
GND
U8
FMMT717
TR3
5
2
3
1
3
1
1
8-Apr-2003
H:\TEMP\060-01.sch
060-01
C3
01uF
R9
120K
VCC
TP2
TEST_POINT
Super Rint
C2
01uF
Number
5
6
7
8
VCC
R28
100R
TP1
TEST_POINT
1
3
Revision
TR2
FMMT617
R15
47R
6
6
Sheet 1 of 1
Drawn By: Chris Lawson
2
1.5
A
B
C
D