Removing an M120 AC Power Supply

The power supplies are located at the rear of the chassis to the right of the CB1. Each power supply weighs approximately 8.4 lb (3.8 kg).

Caution: Do not leave a power supply slot empty for more than 30 minutes while the router is operational. For proper airflow, the power supply must remain in the chassis, or a blank panel must be used in an empty slot.

Note: After powering off a power supply, wait at least 60 seconds before turning it back on.

To remove an AC power supply (see Figure 1):

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.
2. Move the power switch on the power supply faceplate to the standby position.
3. Unplug the power cords from the power source receptacles.
4. Remove the cable restraint from the lower edge of the power supply faceplate by removing its retainer screw.
5. Unplug the power cord from the appliance inlet on the power supply faceplate.
6. Loosen the captive screw on each flange at the top and bottom of the power supply faceplate completely.
7. Grasp the handle on the power supply faceplate and pull firmly. Slide it halfway out of the chassis.
8. Place one hand underneath the power supply to support it and slide it completely out of the chassis.

   Warning: Do not touch the power connectors on the rear of the power supply (see Figure 2). They can contain dangerous voltages.

Figure 1: Removing an M120 AC Power Supply

Figure 2: Rear of the M120 Power Supply Showing Midplane Connector