Removing the Rear Upper Impeller Assembly

To remove the rear upper impeller assembly, follow this procedure (see Figure 77 and Figure 78, which show the two types of impeller that can be installed):

1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and connect the strap to one 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 Electrostatic Discharge Damage.
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.

   To avoid injury, as you slide the assembly out of the chassis do not touch any part of the impeller behind the front panel—the impeller might still be spinning.

4. When the impeller is no longer spinning, slide the assembly completely out of the chassis.