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| Sun Fire X4470 Server ### Service Manual

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## 5.3 Servicing the Power Supply Backplane (FRU)

Use the following procedures to remove and install the power supply backplane.

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

## Remove the Power Supply Backplane

Refer to Removing Power Supply Backplane when completing the following procedure.

1. Prepare for servicing:
   1. Attach an antistatic wrist strap.

      See 2.3 Performing Electrostatic Discharge and Static Prevention Measures.

   2. Power off the server and disconnect all power cords from the server power supplies.

      See 2.6 Powering Off the Server.

   3. Extend the server to the maintenance position.

      See 2.4 Positioning the Server for Maintenance.

   4. Remove the top cover.

      See 2.7 Removing the Server Top Cover.

2. Pull both power supplies at least part way out of the chassis, to disconnect them from the power supply backplane.

   See Remove a Power Supply.

3. Remove the memory riser or filler panel closest to the air divider.

   See 4.1.7 Removing and Installing Memory Risers, DIMMs, and Filler Panels.

4. Remove the air divider by pulling it up and out of the chassis.
5. Remove the ribbon cable connecting the power supply backplane to the motherboard.
6. Remove the screw holding the power supply cover in place and remove the power supply cover (Step 1 in Removing Power Supply Backplane).
7. Remove the motherboard.

   See Remove the Motherboard. The motherboard removal procedure involves removing the four bus bar screws that secure the motherboard to the power supply backplane, as shown in Step 2 in Removing Power Supply Backplane).

8. Disconnect the AC cables from power supply backplane.
9. Lift the power supply backplane out of the chassis (Step 3 in Removing Power Supply Backplane).

   Figure 5-6 Removing Power Supply Backplane

## Install the Power Supply Backplane

Refer to Installing the Power Supply Backplane when completing the following procedure.

1. Unpack the replacement power supply backplane and place it on an antistatic mat.
2. Hold the power supply backplane at the end of the power supply cage and connect the AC cables to the AC connectors on the power supply backplane.

   Ensure that each AC cable is connected to the appropriate connector. The AC cable on the right must be connected to the AC connector on the right and the AC cable on the left must be connected to the AC connector on the left.

3. Insert the power supply backplane into position by ensuring that the tabs on the power board slide onto the hooks on the power supply cage (Step 1 in Installing the Power Supply Backplane).
4. Install the motherboard.

   See Install the Motherboard. The motherboard installation procedure involves reinserting and tightening the four bus bar screws that secure the motherboard to the power supply backplane, as shown in Step 2 in Installing the Power Supply Backplane)

5. Replace the power supply cover and fasten it in place with the screw (Step 3 in Installing the Power Supply Backplane).
6. Reconnect the ribbon cable from the motherboard to the power supply backplane.
7. Reinstall the air divider by sliding it into the chassis.
8. Reinstall the memory riser or filler panel closest to the air divider.

   See 4.1.7 Removing and Installing Memory Risers, DIMMs, and Filler Panels.

   Figure 5-7 Installing the Power Supply Backplane

9. Push the power supplies all the way back into the chassis.

   See Install a Power Supply.

10. Return the server to operation:
    1. Install the top cover.

       See 6.1 Replacing the Server Top Cover.

    2. Return the server to the normal rack position.

       See 6.2 Returning the Server to the Normal Rack Position.

    3. Reconnect all power cords to the server power supplies and power on the server.

       See 6.3 Powering On the Server.

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