Troubleshooting
• 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 one of the required Input LEDs is not lit, perform each of the following checks on the power cord used
for that half of the power supply unit:
3. If the Output LED is not lit, verify that the power switch is turned on (ON or 1).
4. Make sure that the power supply unit is properly seated in the power supply bay by performing the
following steps:
5. Verify that the power supply unit is functional by replacing it with another power supply (see the
an AC Power Supply Unit During Operations" section on page 10-2
the same AC source. If the Input and Output LEDs turn green on the replacement power supply unit,
contact Cisco TAC (see the
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.
Step 2
If one of the required Input LEDs is not lit, perform each of the following checks on the power cord used for that half of
the power supply unit:
• Make sure that the power cord is securely connected to the AC source.
• For a 6-kW power supply unit, make sure that the power cord is securely connected to the power supply unit. Verify
that the cable retention device on the power supply unit is securely holding the power cord.
• Turn the power supply switch to standby (STBY or 0) and then disconnect the power cord from the AC source and
reconnect with another AC source. After you connect to the AC source, turn the power switch on (ON or 1).
Step 3
If the Output LED is not lit, verify that the power switch is turned on (ON or 1).
Step 4
Make sure that the power supply unit is properly seated in the power supply bay by performing the following steps:
a) Turn the power switch to standby (STBY or 0).
b) Loosen the four captive screws on the power supply unit so that they are no longer in contact with the chassis.
c) Pull the power supply unit part way out of the chassis and then push it back into the power supply bay. Make sure
that the captive screws on the power supply unit align with their holes in the chassis.
d) Tighten the four captive screws to 8 in-lb (0.90 N·m).
e) Turn the power switch on (ON or 1).
Step 5
Verify that the power supply unit is functional by replacing it with another power supply (see the
Power Supply Unit During Operations" section on page 10-2
Contacting Customer Service, on page
) and plugging its power cords into the same AC source. If
Troubleshooting an AC Power Supply Unit
Table D-6 on page D-6
"Replacing
) and plugging its power cords into
10) to replace the defective power
"Replacing an AC
Troubleshooting
3
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