Troubleshooting Blower Operation - Cisco 7500 Series Configuration Manual

Chapter 8 Troubleshooting a Cisco 7500 Series Router
R E V I E W D R A F T — C I S C O C O N F I D E N T I A L
If you are still unable to resolve the problem, contact a service representative for
further instructions.

Troubleshooting Blower Operation

If you suspect your blower has failed, check the following to help isolate the problem:
•
•
OL-5008-03 B0
This message could also indicate a faulty component or temperature sensor. Before the system
shuts down, use the show environment or show environment table commands to display the
internal chassis environment. (For detailed descriptions of show commands, see the
"Cisco 7513 and Cisco 7513-MX Environmental show Command Examples" section on
page 2-31.)
When you start up the system, does the blower go on?
To determine whether the blower is operating, listen for the blower motor. In noisy environments,
place your hand next to the front 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 +24 VDC power supply to the blower either at the power
supply or at the blower control board.
If no and the output fail LED is off, ensure that the blower module is seated properly. Try
–
reseating the blower module and 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
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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).
– The following message, if displayed, 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 assembly.
The following message, if displayed, 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.
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 sides of the chassis to allow cooling air to flow.
The preceding message could also indicate a faulty component or temperature sensor. Before
the system shuts down, use the show environment or show environment table commands (See
the "Cisco 7513 and Cisco 7513-MX Environmental show Command Examples" section on
page 2-31 to display the internal chassis environment.)
Troubleshooting Blower Operation
Cisco 7500 Series Installation and Configuration Guide
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