Maintaining the Cisco12008 7-39
Removing and Replacing the Fan Trays
The Cisco12008 supports online insertion and removal of field-replaceable units (FRUs);
thus, you can remove and replace a fan tray while the rest of the system remains powered
up and fully operational.
Note If you replace a defective fan tray while the router is running, you must do so quickly
to minimize the risk of overheating router components. The system shuts down
approximately 2 minutes after reaching the shutdown temperature threshold; therefore, you
should replace a defective fan tray within this time span.
You will need the following tools and parts to remove or install a fan tray:
•1/4-inch flat-blade screwdriver
•ESD-preventive wrist strap
•Lower card cage fan tray—product number GSR8-SYSBLOWER=
•Power supply fan tray—product number GSR8-PWRBLOWER=
Removing the Fan Tray from the Lower Card Cage
To remove the fan tray from the lower card cage, perform the following steps.
Step1 Loosen the two panel fastener screws on each side of the air filter assembly (see
Figure7-10); remove the assembly to expose the interior of the lower card cage
and set it aside.
Step2 Loosen the two captive installation screws at the sides of the fan tray.
Step3 With one hand, grasp the ring-shaped insertion/extraction tab in the middle of
the fan tray carrier; gently slide the fan tray halfway out of the guide rails to
disengage the fan tray connector from the backplane (see Figure7-10).
Step4 Place your free hand beneath the fan tray to support its weight and slide the
module completely out of the card cage.
Step5 Set the fan tray aside.