Removing the Rear Lower Impeller Assembly

The rear lower impeller assembly is located to the left of the circuit breaker box on the rear of the chassis, as shown in Figure 2. The assembly weighs approximately 5 lb (2.3 kg).

To remove the rear lower impeller assembly, follow this procedure (see Figure 39):

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.