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CiscoASR 9000 Series Aggregation Services Router Hardware Installation Guide
Chapter4 Troubleshooting the Installation
Troubleshooting the Cooling Subsystem
•You allow sufficient air flow by maintaining a minimum of 6inches (15.24 cm) of clearance at both
the inlet and exhaust openings on the chassis and the power modules to allow cool air to enter freely
and hot air to be expelled from the chassis.
Isolating Cooling Subsystem Problems
Follow these steps to isolate a problem with the chassis cooling system if you have an overtemperature
condition:
Step1 Make sure the fan trays are operating properly when you power on the system. To determine if a fan tray
is operating, check the LED indicator on each fan tray front panel:
•OK (green)—Fan tray is functioning properly and receiving –48 VDC power, indicating that the
cables from the chassis backplane to the fan tray are good.
•Fail (red)—Fault is detected in the fan tray. Replace the fan tray.
•If neither indicator is on and the blower is not operating, there may be a problem with either the fan
tray or the –48 VDC power supplied to the fan tray. Go to Step 2.
Caution Never unplug all the fan trays at the same time.
Step2 Eject and reseat the fan tray making sure the captive screws are securely tightened to a torque of
10 +/–1 in-lb.
If the fan tray still does not function, go to Step 3.
Step3 Check for –48 VDC power by looking at the LED indicators on each power module:
•If the Pwr OK indicator is on and the Fault indicator is off on each power module, it indicates that
the fan trays are receiving –48 VDC:
–
If a fan tray is still not functioning, there could be a problem with the fan tray controller card
or an undetected problem in the fan tray cable. Replace the fan tray.
–
If the new fan tray does not function, contact a Cisco customer service representative for
assistance.
•If the Fault indicator is on, the power supply is faulty. Replace the power supply.
•If the Temp and Fault indicators are on, an overtemperature condition exists:
–
Verify that the power supply fan is operating properly.
–
If the fan is not operating, replace the power supply.
–
Contact your Cisco representative if replacing the power supply does not fix the problem.