Cisco XR 12404 - Manual (Page 123)

4-25
Cisco XR 12404 Router Installation Guide
OL-13830-02
Chapter 4 Troubleshooting the Installation
Troubleshooting the Cooling Subsystem
• 7 fans
• 2 controller cards
• 1 connector
Check the following to help isolate a problem with the cooling system:
• Do the fans come on?
Note In noisy environments listen for the fans. Place your hand at the left side
of the chassis beside the fan tray assembly to feel for air being forced out
the exhaust vents.
• 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
securing it to the chassis. Pull the assembly out a few inches and firmly
push in back in to reseat it. 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
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