9 Anesthetic Gas Module Troubleshooting the Anesthetic Gas Module
222
Power Supply Diagnostic Checks
Symptom Possible Cause Corrective Action
Power Supply shows
Problem
Weak pump If this Problem is flagged temporarily during
a zero calibration or purge mode this could
indicate a weak pump. Replace the pump if
problem persists
Defective power supply
Using a voltmeter, check the power supply
voltages at the main PC board. The power
supply connectors should carry the following
voltages:
TP14: +12V ±600 mV
TP15: +5V ±250 mV
TP16: -12V ±600 mV
TP17: +12V ±600 mV
TP18: Analog Ground
If any of the above voltages are out of limits,
carry out the checks again while
systematically disconnecting the
subassemblies (remember to power off the
Module before removing cables and
subassemblies). If the voltage(s) are still out
of limits, replace 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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