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#### Power Distribution Board Overview

The power distribution board distributes main 12V power from the power supplies to the rest of the system. It is directly connected to the connector card and to the motherboard by means of a bus bar and ribbon cable. This board also supports a top cover safety interlock (“kill”) switch.

It is easier to service the power distribution board with the bus bar assembly attached. If you are replacing a faulty power distribution board, you must remove the bus bar assembly from the old board and attach the assembly to the new power distribution board.

When a faulty power distribution board is replaced, the chassis serial number and part number must be programmed into the new power distribution board. This must be done in a special service mode by trained service personnel. These numbers are needed for obtaining product support.

| Caution - The system supplies power to the power distribution board even when the server is powered off. To avoid personal injury or damage to the server, you must disconnect all power cords before servicing the power distribution board.

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