Cisco 12404 Installation And Configuration Manual page 197

Chapter 4 Troubleshooting the Installation
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If the fans come On, the –48 VDC line from the power supply to the fan tray
assembly is good.
If the fans do not come On, there could a problem with either the fan tray
assembly or the –48 VDC power. Check the OUTPUT FAIL LED on each
power supply. If the OUTPUT FAIL LED on a PEM is On, the PEM is faulty
and should be replaced.
If the fans do not come on and the PEM OUTPUT FAIL LED is Off (–48 VDC
is OK), ensure that the fan tray assembly is seated properly to the backplane
connector.
Remove the fan tray assembly by loosening the two captive screws
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holding it to the chassis, grasp the fan tray assembly handle and pull the
fan tray assembly out and then firmly push the fan tray assembly into its
housing to reseat the fan tray assembly. Tighten the two captive screws.
If the fans do not come on, there could be a problem with the fan tray
assembly controller card.
The following message on your console monitor, indicates that the system has
detected an overtemperature condition or out-of-tolerance power inside your
router.
Queued messages:
%ENVM-1-SHUTDOWN: Environmental Monitor
initiated shutdown
An overtemperature condition is unlikely at initial startup due to an
environmental shutdown. As a precaution, ensure that heated exhaust air from
other equipment is not entering the air filter, and that there is sufficient
clearance (at least 6 inches, 15.24 cm) around all sides of the chassis to allow
cooling air to enter and hot air to exhaust. Should an overtemperature
condition occur at initial startup:
Check the condition of the air filter. If the air filter appears dirty, you
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should remove the air filter and replace it; or remove the air filter, take it
away from the chassis, and vacuum the air filter.
The overtemperature condition message could also indicate a faulty
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component or temperature sensor. Before the system shuts down, use the
show environment all or show environment table commands to display
the internal system environment including voltages and temperatures
measured at each card.
Cisco 12404 Internet Router Installation and Configuration Guide
Troubleshooting the Cooling Subsystem
4-27