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7-2
Cisco Nexus 7000 Series Hardware Installation and Reference Guide
OL-18634-01
Chapter 7 Troubleshooting
Troubleshooting the Power Supply
• For an amber SUP LED, see the “Troubleshooting the Supervisor Modules” section on page 7-3.
• For an amber FAB LED, see the “Troubleshooting the Fabric Modules” section on page 7-4.
• For an amber IOM LED, see the “Troubleshooting the I/O Modules” section on page 7-5.
Troubleshooting the Power Supply
The following conditions indicate that you need to troubleshoot one or more power supply units:
• The PSU LED on the chassis is amber.
• The Input 1, Input 2, 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 Table C-5 on
page C-5.
To troubleshoot a power supply problem, follow these steps:
Step 1 Determine which power supply unit has a problem. Check to see which power supply unit does not have
its Input 1, Input 2, and Output LEDs lit.
Note If a power supply unit has only one power cord attached to an AC source, only the Input LED
for the connected half of the power supply unit should be 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.
• 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.
• Disconnect the power cord from the AC source and reconnect with another AC source.
Step 3 If the Output LED is not lit, verify that the power switch is turned to ON.
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).
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 lb. in.
e. Turn the power switch to ON.
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