Cisco Systems 7401ASR manual Troubleshooting the Power Subsystem

Chapter 5 Troubleshooting

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	Possible Cause	Possible Solution
System begins power on,	System has failed to boot Cisco IOS,	Power off, and reboot the system. Check to be sure
amber STATUS LED	turning the STATUS LED green.	you are using the correct Cisco IOS release. If
comes on.		Cisco IOS does not boot, and the green STATUS
		LED is not displayed, contact a service
		representative.
System does not power	AC power cable not fully seated at system	Turn the router power switch to the off position and
on.	or at the wall outlet (power source).	reseat the AC power cable at the system or at the
		wall outlet (power source).
	DC power cable not turned on at the panel	Turn the router power switch to the off position and
	board of the circuit breaker.	locate the circuit breaker on the panel board that
		services the DC circuit, switch the circuit breaker
		to the on position.
	Power source is faulty.	Turn the switch off, connect the power cable to
		another power source, if available, and turn the
		router power switch back on.
	Faulty power cable.	Turn the switch to the off position, remove the
		cable and replace it.
	Faulty power supply.	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.
System powers off, no	Power supply failure.	Contact a service representative.
STATUS LED, and no
operating fans.

Cisco 7401ASR Installation and Configuration Guide

5-4 OL-5419-01 B0