Gigabit Switch Router Installation and Configuration Guide

Maintaining the Cisco 12008 7-39
Removing and Replacing the Fan Trays
The Cisco 12008 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.
Step 1 Loosen the two panel fastener screws on each side of the air filter assembly (see
Figure 7-10); remove the assembly to expose the interior of the lower card cage
and set it aside.
Step 2 Loosen the two captive installation screws at the sides of the fan tray.
Step 3 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 Figure 7-10).
Step 4 Place your free hand beneath the fan tray to support its weight and slide the
module completely out of the card cage.
Step 5 Set the fan tray aside.