Troubleshooting A Dc Power Supply Unit - Cisco Nexus 7000 Hardware Installation And Reference Manual

Chapter 9 Troubleshooting
For a listing of the power supply unit LEDs and the conditions that they indicate, see
page
To troubleshoot a power supply problem, follow these steps:
Determine which power supply unit has a problem. Check to see which power supply unit does not have
Step 1
its Input and Output LEDs lit.
If one of the required Input LEDs is not lit, perform each of the following checks on the power cord used
Step 2
for that half of the power supply unit:
•
•
•
If the Output LED is not lit, verify that the power switch is turned on (ON or 1).
Step 3
Make sure that the power supply unit is properly seated in the power supply bay by performing the
Step 4
following steps:
a.
b.
c.
d.
e.
Verify that the power supply unit is functional by replacing it with another power supply (see the
Step 5
"Replacing an AC Power Supply Unit During Operations" section on page
cords into the same AC source. If the Input and Output LEDs turn green on the replacement power supply
unit, contact Cisco TAC (see the
defective power supply unit.
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:
•
•
•
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.
OL-23069-07
D-6.
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).
Turn the power switch to standby (STBY or 0).
Loosen the four captive screws on the power supply unit so that they are no longer in contact with
the chassis.
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.
Tighten the four captive screws to 8 in-lb (0.90 N·m).
Turn the power switch on (ON or 1).
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.
"Contacting Customer Service" section on page
Cisco Nexus 7000 Series Hardware Installation and Reference Guide

Troubleshooting a DC Power Supply Unit

Table D-6 on
10-2) and plugging its power
9-8) to replace the
9-3