Troubleshooting a DC Power Supply Unit
the Input and Output LEDs turn green on the replacement power supply unit, contact Cisco TAC (see the
Customer Service, on page
If you cannot determine the problem with the power supply or determine which power supply unit has the problem,
contact TAC.
Troubleshooting a DC Power Supply Unit
The following conditions indicate that you need to troubleshoot one or more DC power supply units:
• The PSU LED on the chassis is amber.
• The Input LEDs or Output LED on a power supply unit is not green.
• The Fault LED on a power supply unit is flashing red.
Also, when there are power problems with other modules or the supervisor module PWR MGMT LED is
amber, you need to troubleshoot the power supply units or check the seating of the modules that are not
receiving power.
For a listing of the power supply unit LEDs and the conditions that they indicate, see
.
To troubleshoot a power supply problem, follow these steps:
SUMMARY STEPS
1. Determine which power supply unit has a problem. Check to see which power supply unit does not have
its Input and Output LEDs lit.
2. If the Output LED is not lit, verify that the power switch on the power supply unit is turned to ON. If not,
turn it to ON and verify that the Output LED turns on.
3. If the required Input LEDs are not lit, test the power connections as follows:
4. If the required Input LEDs are still not lit, test the power source as follows:
5. If the Output LED is not lit, verify that the power switch on the power supply unit is turned to ON (or 1).
If not, turn it to ON (or 1) and see if the LED turns on.
6. If the Output LED is not lit, verify that the power supply unit is properly seated in the power supply bay
by performing the following steps:
7. If the Output LED is still not on, verify that the power supply unit is functional by replacing it with another
power supply (see the
and plugging its power cords into the same DC source. If the Input and Output LEDs turn green on the
replacement power supply unit, contact TAC (see the
the defective power supply unit.
DETAILED STEPS
Step 1
Determine which power supply unit has a problem. Check to see which power supply unit does not have its Input and
Output LEDs lit.
Note
If a power supply unit has only one power cord attached to a DC source, only the Input LEDs (Input 1 and
Input 2 or Input 3 and Input 4) for the connected half of the power supply unit should be lit.
Troubleshooting
4
10) to replace the defective power supply unit.
"Replacing a DC Power Supply Unit During Operations" section on page 10-9
Contacting Customer Service, on page
Troubleshooting
Contacting
Table D-6 on page D-6
)
10) to replace
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