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Service Manual
Mainstream Board
The MSP Board is divided into isolated and non-isolated circuitry.
Non-Isolated Circuitry. The Non-Isolated circuitry on the MSP Board interfaces with the
monitor, the printer, the speaker, P6 and P7 expansion connectors, and with the
Mainstream Processor which resides on the isolated section of the MSP Board.
Isolated Circuitry. The Isolated Circuitry directly controls the hardware responsible for
the CO
CPU Circuitry. The CPU Circuitry includes the Philips 80C552 micro controller, 32K of
RAM, 64K of ROM, and standard RESET circuitry.
A UART directly interfaces with the pulse oximetry SpO
measurement function.
The CO
Expansion Modules, but not from each other.
co2 block
EXTENDER
BOARD
MULTIPLEX
measurement function.
2
and SpO
functions are isolated from all other subsystems in the monitor or
2
2
CAPNOGRAPHY FUNCTIONAL BLOCK DIAGRAM
MSP NON-ISOLATED CIRCUITRY
PRINTER
NON-ISO
I/F CONN.
POWER
EXP.
IPC EXP.
#1 CONN.
CIRC.
EXP.
SPEAKER
#2 CONN.
I/F CIRC.
SSP NON-ISOLATED CIRCUITRY
INFRARED
SOURCE
DETECTOR
CONTROL
PUMP
CONTROL
MOTOR
DRIVE
CPU
MOTOR
SENSE
(POSITION)
PRESSURE
SENSORS &
AMPLIFIERS
A/D
WATER
CONV.
TRAP
&
DETECTOR
CONTROL
CO2 SIGNAL
TEMPERATURE
(Pneumatic connections
not shown.)
2
MSP ISOLATED CIRCUITRY
ISO PWR
ISO PWR
INFRARED
SUPPLY
TRANS.
SOURCE
HEATER
MOTOR
CPU
OPTO
COUPL.
SENSE
OPTO
COUPL.
SIGNAL
A-D
CONV.
SIDE-
NELLCOR
STREAM
SPO2
SPO2
STICK
I/F CIRC.
BOARD
PCB
PUMP
FILTER
PUMP
Technical overview
Board providing the SpO
DET.
BIAS
CIRC.
CIRC.
CO2
DRIVE
SENSOR
POSN.
AND
CONN.
DET.
DET.
TEMP.
BARO.
SPO2
XDUCER
AND
CONN.
1097-13
127
2
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