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| Sun Fire X4470 Server ### Service Manual

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## 5.4 Servicing the Disk Drive Backplane (FRU)

Use the following procedures to remove and install the disk drive backplane.

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

## Remove the Disk Drive Backplane

Refer to Removing the Disk Drive 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.

      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. Remove all disk drives and fillers.

   See Remove a Disk Drive.

3. Remove the DVD drive.

   See Remove the DVD Drive or DVD Drive Filler Panel.

4. Remove power cable, ribbon data cable, and any SAS/SATA cables from the disk drive backplane.
5. Push up on the wire tab in the upper corner and pull the disk drive backplane up and out of the chassis.

   Figure 5-8 Removing the Disk Drive Backplane

## Install the Disk Drive Backplane

Refer to Installing the Disk Drive Backplane when completing the following procedure.

1. Unpack the replacement disk drive backplane and place it on an antistatic mat.
2. Insert the disk drive backplane into the chassis.

   Verify that the disk drive backplane is seated properly at the bottom, in the small slot near the DVD drive.

3. Lift up the metal hook and press the disk drive backplane to the front until it snaps into place.
4. Replace the power cable, ribbon data cable, and any SAS/SATA cables.

   The mini-SAS plug that terminates the short SAS/SATA cable must be inserted into the upper mini-SAS connector on the disk backplane. This short cable connects the SATA DVD to its USB-SATA bridge on the motherboard. The longer SAS/SATA cable connects drive bays 4 and 5 to a storage device in the rear of the system. The lower mini-SAS connector on the disk backplane requires the standard, four-channel mini-SAS cable for drive bays 0 to 3.

   Figure 5-9 Installing the Disk Drive Backplane

5. Replace all disk drives and filler panels.

   See Install a Disk Drive.

6. Replace the DVD drive.

   See Install the DVD Drive or DVD Drive Filler Panel.

7. 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. 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 disk backplane by authorized service personnel with the correct product serial number located on the chassis EZ label.

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