Removing a DC Power Supply
Before removing a DC power supply from an M7i router with only one power supply, you must power off the router. See Powering Off the M7i Router. The DC power supplies are located at the bottom rear of the chassis, as shown in M7i Chassis Description. Each DC power supply weighs approximately 7 lb (3.2 kg).
 | Caution: Do not leave a power supply slot empty for more than a short time while the router is operational. The power supply must remain in the chassis for proper airflow. |
To remove a DC power supply (see Figure 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. Verify that the router is attached to a proper earth ground.
- Press the power switch for the power supply (located on
the power supply faceplate) to the OFF (O)
position.
Note: If you are power cycling the power supply rather than shutting it off for a time, wait at least 60 seconds after turning it off before turning it back on. If you need to power it off again, wait for at least 60 seconds after powering it on.
- Shut off the power flowing to the power supply from the external power source, so that the voltage across the leads of the power cables is 0 V. Ensure that there is no chance that the cable leads might become active during the procedure.
- Using a number 1 Phillips screwdriver, turn the screw on each field-wiring terminal counter-clockwise to loosen the terminal connector from around the cable lug.
- Remove the cables from the terminal connectors and from the hook located on the faceplate to the right of the field-wiring terminals.
- Loosen the thumbscrew at each corner of the power supply faceplate, using a Phillips screwdriver if necessary.
- Grasp the handle on the power supply faceplate and pull firmly to slide the unit about halfway out of the chassis.
- Place one hand under the power supply to support it, then slide it completely out of the chassis.
Figure 1: Removing a DC Power Supply
