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COMSPHERE –48 Vdc Central Office Power Unit
3-2 May 1998 3000-A2-GB41-40
Troubleshooting
If operating in the Basic mode and the power module’s
Power LED is red, check the DCEs in the carrier. If the
LEDs on the DCEs are not lit, try resetting the power
module. (Reset the power module by removing the power
module and then reinstalling it.) If the Power LED
remains red after resetting the power module, you should
replace the power module. Do not remove the failed
power module until a replacement power module is
available. If the power LED is red and the DCEs appear to
be working, schedule maintenance for the power module
after peak hours at which time you can try resetting the
power power module and/or replacing it. If the Fan Alarm
LED is yellow and the DCEs in the carrier appear to be
working, you may want to schedule maintenance after
peak hours.
If operating in the Independent mode and one of the
power module’s Power LED is red, check the DCEs in the
carrier.
• If the LEDs on the DCEs above the power modules
are not lit, try resetting the power module. (Reset
the power module by removing the power module
and then reinstalling it.) If the Power LED remains
red after resetting the power module, you should
replace the power module. Do not remove the failed
power module until a replacement power module is
available.
• If the DCEs appear to be working, schedule
maintenance for the power module after peak hours
at which time you can try resetting the power
module and/or replacing it.
Also in Independent mode, if the Fan Alarm LED is
yellow and the DCEs in the carrier appear to be working,
you may want to schedule maintenance after peak hours.
If operating in the Redundant mode and one of the
power module’s Power LED is red, try resetting the power
module by removing the power module and then
reinstalling it. If the Power LED remains red, you should
replace the power module.
In addition, if the Fan Alarm LED is yellow, try
resetting the power module. If the Fan Alarm LED
remains yellow, you should replace the power module.
In all modes of operation, if the Power LED is not lit,
check the input power source and external fuses before
replacing the power module. If –48V is present at the
input connector, replace the power module. If –48V is not
present, check your distribution system.