# Replacing a Power Distribution Unit

To replace a power distribution unit (PDU):

1. Power down the router. See Powering Down.
2. Remove the clear plastic guard covering the PDU.

   | Warning: Be sure the power source is turned off and all power switches are in the OFF position.

3. Disconnect the power cables and grounding cables. See Figure 31.
4. With an appropriate screwdriver, loosen the screws located at the corners of the PDU.

   | Note: Loosen the top and bottom thumbscrews (using a No. 2 Phillips screwdriver, if necessary)

5. Using two hands, pull the PDU out of the chassis.
6. Install the new PDU and tighten the screws.

   | Caution: Do not overtighten the screws.

7. Reconnect the power cables and grounding cables. See Cabling the Router for Power
8. Replace the clear plastic guard.
9. Power up the router. See Powering Up the Router.

Figure 31: PDU