Replacing Hardware Components
2. Attach an electrostatic discharge (ESD) grounding strap to your bare wris t and
connect the strap toone of the ESD points on the chassis. Make sure the router
is attached to a proper earth ground. For more information about ESD, see
“Preventing ElectrostaticDischarge Damage” on page 226.
3. Loosen the thumbscrew at each end of the fan tray,using a Phil lips screwdriver
if necessary.
4. Grasp the sides of the fan tray and pull firmly to slide it halfway out of the
chassis.
CAUTION: To avoidinjury, keep tools and your fingers awayfrom the fans as you
slide the fan tray out of the chassis. The fans might still be spinning.
5. Place one hand under the fantray to support it and slide the tray completely
out of the chassis after the fans stop spinning.
Figure 69: Removing the Fan Tray
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Installing the Fan Tray
To install the fan tray, follow thi s procedure (see Figure 70):
CAUTION: When sliding the fan tray intothe chassis, take care not to catch and
pinch any dangling PIC cables with the edges of the t ray. Als o make sure your
fingers are not near the fans,which start spinning as soon as the fan tray contacts
the midplane.
Replacing Cooling System Components 149