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February 2003 4-13
1000-A2-GN22-00 4. Troubleshooting
Step 2 Check the CPX plug-in module indicators to verify that they are
operating correctly. If any indicator states are incorrect, identify the
module type and refer to the appropriate table for action.
Note
The CPX may take several minutes to initialize,
depending on the number of PSTN and ATM modules.
Table 4–9. Power Failure Troubleshooting
Symptom Probable Causes Corrective Action
All CPX plug-in
module indicators are
off.
A power surge tripped the
CPX circuit breaker.
Turn the circuit breaker on to apply
power to the CPX.
Faulty –48 Vdc output
wiring, from the plant
battery distribution point
to the CPX.
1. Check the -48 Vdc and battery
return connections between the
power source and CPX A and B
terminals (see Figure 4–2
).
2. Replace faulty wiring as required.
-48 VDC plant battery
source is faulty.
1. Verify that the -48VDC plant battery
has the correct polarity.
2. Measure the plant battery voltage at
the power distribution point
(–42 VDC to –56 VDC).
Out Of Service power
supply module
indicator is lit.
Power supply module is
faulty.
Replace the module (see Install Power
Supply/Fan Module on page 5-3).
None of the Power
Supply module
indicators are lit.
CPX is not powered up. Perform system power failure
troubleshooting.
Cooling failure on one
power supply.
Fan failure or jammed fan
shutter.
Replace the power supply.
Cooling failure for
more than one power
supply.
Airflow blockage. 1. Check air inlets and outlets for
obstructions.
2. Clean or replace the air filters.
Excessive ambient air
temperature.
Reduce the room air temperature.