Troubleshooting the Anesthetic Gas Module 9 Anesthetic Gas Module
223
Operating Temperature Diagnostic Checks
Test Points, Connectors and Jumpers
Test Points
The following table lists the test points; also refer to Figure 51.
Symptom Possible Cause Corrective Action
Oper. Temp. shows
Problem
Defective fan Check that the fan runs smoothly and check
its cable. If necessary, replace fan or cable.
Insufficient air
circulation due to fan
working inefficiently
Check the fan aperture for blockages or dust
on the fan blade or guard. If necessary,
unblock or clean the fan aperture.
Operating environment
for the module falls
outside of specified
limits
Do not operate the module in such an
environment.
Defective IR
measurement assembly
head
Follow its corrective action.
Defective agent ID
head
Follow its corrective action
Defective power supply
Follow its corrective action
Defective main PC
board.
If the checks above do not solve the problem,
replace the main PC board.
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TP1
Analog Gnd 1 (AGND1)
TP2
Analog Dark Level Clamp (10DLCL)
TP3
M1026A Preamp Signal 400mVpp ±30mv
1
TP4
M1026A A/D Converter Input
TP5
AC Pump Motor Reference (not used)
TP6
IR source voltage for IR measurement
assembly head (R178)
7.87 V ±20mv
TP7
Thermal Electric Cooler Drive Voltage to
M1026A Head (TE+)
250mV ±100mV
(after at least 15
min. warm-up)
TP8
Oxygen Transducer Signal Output
(O
2
SIG). Signal varies with O
2
concentration.
Examples: 20.8% O
2
is approx. 208mV,
50.0% O
2
is approx.
500mV
TP9
Analog Ground 2 (AGND2)
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