Removing the Rear Upper Impeller Assembly

The rear upper impeller assembly is located at the top of the chassis rear, as shown in Figure 2. The assembly weighs approximately 4 lb (1.8 kg).

To remove the rear upper impeller assembly, follow this procedure (see Figure 37 and Figure 38, 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 screws at opposite corners of the impeller cover and slide the assembly out of the chassis.