Cisco Systems 7500 Series manual V I E W D R a F T C I S CO CO N F I D E N T I a L

Chapter 8 Troubleshooting a Cisco 7500 Series Router

Troubleshooting Guidelines for the Cisco 7513, Cisco 7513-MX, and Cisco 7576

R E V I E W D R A F T — C I S CO CO N F I D E N T I A L

If you are unable to resolve the problem or if you determine that either the power supply or power cable is faulty, contact a service representative for instructions.

Troubleshooting the Cisco 7513, Cisco 7513-MX, and Cisco 7576 Cooling Subsystem

This section provides information on troubleshooting the Cisco 7513, Cisco 7513-MX, and Cisco 7576 cooling subsystem.

Check the following to help isolate the problem:

•When you start up the system, does the blower go on?

To determine if the blower is operating, listen for the blower motor. In noisy environments, place your hand near the middle of the plastic panel on the front of the chassis (opposite the interface processor end of the chassis) to feel for air being forced out the exhaust vent.

–If yes, the +24 VDC line to the blower is good, but there might be a problem with the software.

–If no, there is a problem with the blower or the +24 VDC power. If the output fail LED is on, there could be a problem with the +24VDC supply to the blower either at the power supply or the blower control board.

–If no and the output fail LED is off, ensure that the blower module is seated properly. To remove and reseat the blower module, see the “Removing and Replacing the Cisco 7513, Cisco

7513-MX, and Cisco 7576 Blower Module” section on page 7-10. Ensure that the blower control board edge connector is inserted fully in the backplane socket. After you replace the chassis cover panel, try starting the system again.

•Do the system and blower start up but shut down after about 2 minutes?

–If you have changed the software configuration register boot field settings or altered the configuration file boot instructions, the system could be booting a software image that does not recognize the signals from the blower control board, and therefore assumes that the cooling subsystem is not operating.

–If the following message is displayed, it indicates that the blower has failed or is operating out of tolerance:

%ENVM-2-FAN: Fan has failed, shutdown in 2 minutes

If the blower or the blower control board fails, you must replace the blower module.

–If the following message is displayed, it indicates that the system has detected an overtemperature condition or out-of-tolerance power inside the chassis:

Queued messages:

%ENVM-1-SHUTDOWN: Environmental Monitor initiated shutdown

If an environmental shutdown results from an out-of-tolerance power condition, the output fail LED will go on before the system shuts down. See the “Troubleshooting the Cisco 7513, Cisco 7513-MX, and Cisco 7576 Power Subsystem” section on page 8-15.

Although an overtemperature condition is unlikely at initial startup, ensure that heated exhaust air from other equipment is not entering the inlet vents, and that there is sufficient clearance around the front and rear of the chassis to allow cooling air to flow. Refer to the guidelines in Chapter 2, “Preparing for Installation,” for preventive site preparation recommendations.

	Cisco 7500 Series Installation and Configuration Guide
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