Replacing Hardware Components
The assemblyis hot-removable and hot-insertable,as described in Field-Replaceable
Units (FRUs) on page 4. To replace it, perform thefollowing procedures:
Removing the Rear Lower Impeller Assembly on page 155
Installing the Rear Lower Impeller Assembly on page 155
Removing the Rear Lower Impeller Assembly
Toremove the rear lower impeller assembly,follow this procedure (see Figure 75):
1. 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.
2. Loosen the thumbscrew at each corner of the impeller cover, using a Phillips
screwdriver if necessary.
3. Grasp the thumbscrews at opposite corners of the impeller cover and slide the
assembly halfway out of the chassis.
CAUTION: Toavoid injury, as you slide the assemblyout of the chassis do not touch
any part of the impeller behind the front panel—the impeller might still be spin ning.
4. When the impeller is no longer spinning, slide the assembly completely
outofthechassis.
Figure 75: Removing the Rear Lower Impeller Assembly
1914
Installing the Rear Lower Impeller Assembly
To install the rear loweri mpeller assembly,follow this procedure (see Figure 76:
Replacing Cooling System Components 155