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## How to Install the Power Distribution Board

1. To remove the power distribution board, see How to Remove the Power Distribution Board.
2. Align the new board so that the chassis standoffs protrude through its keyed openings, then slide the power distribution board downward to lock it into place.
3. Align the bus-bar post with the openings in the PDB.
4. Secure the power distribution board to the bus bars, using the two bus-bar nuts.

   Note - Do not torque the nuts to specification, yet.

5. Loosen the topmost (negative) bus-bar nut.

   Do not loosen the lower (positive) bus-bar nut.

6. Remove enough of the CPU modules or filler cards to provide access to the opposite side of the chassis midwall. See How to Remove a CPU Module or Filler Card.

   Make note of the CPU module and filler card positions, so you can return them to their original slots.

7. Press and hold the negative bus bar against the chassis midwall (on the motherboard side of the midwall).

   This action removes the flex from the bus bar ensuring that the bus bar lies flat against the chassis midwall.

   Note - The bus bars might be covered with a mylar insulation. Do not remove the insulation. The insulation protects the DIMMs on the CPU module in slot A.

8. To secure the negative bus bar flat against the midwall, push on the bus bar and tighten the negative bus-bar nut.
9. Use a 3 mil shim stock to verify the minimum clearance between the insulation on the bus bars and the DIMMs on a fully-loaded CPU module. See Bus Bar to DIMM Clearance Verification.

   The DIMMs must not contact the insulation on the bus bars.

10. Torque both bus-bar nuts to 7 inch-pounds (0.8 newton-meters).
11. Tighten the captive screws that secures the power distribution board to the chassis.
12. Reconnect the flex cable connector to the connector on the power distribution board .
13. Install all power supplies. See How to Install a Power Supply.
14. Prepare the server for operation. See How to Prepare the Server for Operation.

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