Remove a DC Power Supply

The DC power supplies are located at the bottom rear of the chassis, as shown in Figure 3. Each DC power supply weighs approximately 7 lb (3.2 kg).

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, follow this procedure (see Figure 36):

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. For more information about ESD, see Prevent Electrostatic Discharge Damage.
2. Press the power switch for the power supply (located on the power supply faceplate) to the OFF (O) position.

   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.

3. 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.
4. Using a 3-mm flat-blade screwdriver, turn the screw on each quick-connect terminal counter-clockwise to loosen the terminal connector from around the cable.
5. Remove the cables from the terminal connectors and from the hook located on the faceplate to the right of the quick-connect terminals.
6. Loosen the thumbscrew at each end of the power supply faceplate, using a Phillips screwdriver if necessary. Unscrew both thumbscrews simultaneously and at about the same rate (unscrewing the two screws alternately or at very different rates can cause the power supply to become lodged in the slot, making it difficult to turn the screws).
7. Grasp the handle on the power supply faceplate and pull firmly to slide the unit about halfway out of the chassis.
8. Place one hand under the power supply to support it, then slide it completely out of the chassis.

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