Troubleshooting The Power Subsystem - Cisco 7401ASR Installation And Configuration Manual

Problem Solving Using a Subsystems Approach

Troubleshooting the Power Subsystem

Check the following to help isolate a problem with the power subsystem:
Note If the system powers off, wait at least one minute before manually rebooting the system, or it will pause
indefinitely.
Table 5-1 Troubleshooting the Power Subsystem
Symptom
System begins power on,
amber STATUS LED
comes on.
System does not power
on.
System powers off, no
STATUS LED, and no
operating fans.
Cisco 7401ASR Installation and Configuration Guide
5-4
Possible Cause
System has failed to boot Cisco IOS,
turning the STATUS LED green.
AC power cable not fully seated at system
or at the wall outlet (power source).
DC power cable not turned on at the panel
board of the circuit breaker.
Power source is faulty.
Faulty power cable.
Faulty power supply.
Power supply failure.
Possible Solution
Power off, and reboot the system. Check to be sure
you are using the correct Cisco IOS release. If
Cisco IOS does not boot, and the green STATUS
LED is not displayed, contact a service
representative.
Turn the router power switch to the off position and
reseat the AC power cable at the system or at the
wall outlet (power source).
Turn the router power switch to the off position and
locate the circuit breaker on the panel board that
services the DC circuit, switch the circuit breaker
to the on position.
Turn the switch off, connect the power cable to
another power source, if available, and turn the
router power switch back on.
Turn the switch to the off position, remove the
cable and replace it.
If the system still fails to come up when the power
supply is connected to a different power source
with a new power cable, the power supply is
probably faulty. Contact a service representative.
Contact a service representative.
Chapter 5 Troubleshooting
OL-5419-01 B0