9 Anesthetic Gas Module Troubleshooting the Anesthetic Gas Module
220
IR Measurement Assembly Diagnostic Checks
Symptom Possible Cause Corrective Action
Meas. Assy shows
Problem
Defective IR
measurement assembly
head
Do the following IR measurement assembly
head checks:
Check whether Service Note
M1026A-035/038 applies
Remove the sample cell (see Chapter 7) and
visually check it to see if it is contaminated.
The inside of the cell should be smooth and
shiny.
Perform flow and Span gas calibration (in
order to store new reference values)
Using a voltmeter, check the IR source
voltage as follows:
Connect the voltmeter ground to TP1.
Measure TP6 voltage. It should be 7.87V
±20mV.
If this voltage is within limits, proceed to the
next check. If not, adjust the potentiometer
R178 to the required value. If the
adjustment is not possible, replace the
measurement assembly head.
Power off. Connect a replacement head with
the ribbon cable and reconnect the tubing.
Turn power back on and see if the Meas.
Assy still shows
Problem. If the message is
gone, replace the head. If the problem
persists, continue checking.
Defective power supply
Carry out the checks for the power supply .
Defective cables
Check the cables connecting the
measurement head and the main PC board
for signs of damage or wear. Check the
connectors for damaged or loose
connections. If any defects are apparent,
replace the cable.
Defective main PC
board
If the checks above do not solve the problem,
replace the main PC board.
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