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| Sun Fire X4470 Server ### Service Manual

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## 5.5 Servicing the Motherboard (FRU)

Use the following procedures to remove and install the motherboard.

| Caution - Ensure that all power is removed from the server before removing or installing the motherboard assembly. You must disconnect the power cables from the system before performing these procedures.

| Caution - These procedures require that you handle components that are sensitive to electrostatic discharge. This discharge can cause server components to fail. To avoid damage, ensure that you follow the antistatic practices as described in 2.3 Performing Electrostatic Discharge and Static Prevention Measures.

## Remove the Motherboard

Refer to Removing the Motherboard 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. Loosen the captive screw in the corner near the fans that secures the motherboard to the chassis.
3. Disconnect all cables that connect the flash riser, power supply backplane, disk drive backplane, and fan board to the motherboard.
4. Remove all memory risers.

   See Remove a Memory Riser and DIMM.

5. Remove the air divider by sliding it out of the chassis.
6. Remove the four bus bar screws securing the motherboard to the power supply backplane.
7. Remove all PCIe cards from the server.

   See Remove a PCIe Card.

8. Remove the power supply cover plate that secures the SAS cables.
9. Position the cables off to the side, using the tab on the power supply cover.
10. Grasp the handle on the motherboard and slide it toward the front and then out of the chassis.

    Figure 5-10 Removing the Motherboard

## Install the Motherboard

Refer to Installing the Motherboard when completing the following procedure.

1. Unpack the replacement motherboard and place it on an antistatic mat.
2. Grasp the motherboard by the handle and hold the cables off to the side while sliding the motherboard toward the back of the chassis.

   Note - Align the rear Locate button with its corresponding hole in the back of the chassis, and ensure that the Locate button is not jammed in the depressed position.

3. Reinsert and tighten the four bus bar screws that secure the motherboard to the power supply backplane.
4. Reinstall the air divider by sliding it into the chassis.
5. Reinstall all memory risers.

   See Install a Memory Riser Filler Panel.

6. Reconnect all cables from the flash riser, power supply backplane, disk drive backplane, and fan board to the motherboard.
7. Reinstall all PCIe cards.

   See Install a PCIe Card Filler Panel.

8. Reinstall the power supply cover plate that secures the SAS cables.
9. Tighten the captive screw in the corner near the fans that secures the motherboard to the chassis.
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.

       Note - The product serial number used for service entitlement and warranty coverage might need to be reprogrammed on the motherboard by authorized service personnel with the correct product serial number located on the chassis EZ label.

       Figure 5-11 Installing the Motherboard

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