Dell 650 User Manual

Dell™ PowerEdge™ 650 Systems

Replacing the System and Backplane Board Assemblies

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Notes, Notices, and Cautions

NOTE: A NOTE indicates important information that helps you make better use of your computer.

NOTICE: A NOTICE indicates either potential damage to hardware or loss of data and tells you how to

avoid the problem.

CAUTION: A CAUTION indicates a potential for property damage, personal injury, or death.

Abbreviations and Acronyms

For a complete list of abbreviations and acronyms, see the

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Installation and Troubleshooting Guide

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September 2003 P/N G3929 Rev. A00

The system board and backplane board are removed from the chassis as a single assembly, and are then separated for replacement of either board.

Removing the System Board/Backplane Board Assembly

CAUTION: See your System Information Guide for complete information about safety precautions,

working inside the computer, and protecting against electrostatic discharge.

NOTE: It is not necessary to remove the hard drives or the CD/diskette drive from the system during this

procedure.

To remove the system board/backplane board assembly, perform the following steps:

Turn off the system and attached peripherals, and disconnect the system from the electrical outlet.

Open the system. See "Opening the System" in your

If you are replacing the system board, remove the system battery. See "Replacing the Battery" in your

If you are replacing the system board, remove the heat sink and processor. See "Replacing the Processor" in your

If you are replacing the system board, remove the memory modules. See "Removing Memory Modules" in your

Remove the cooling shrouds.

Disconnect the control panel cable from the J3 connector on the backplane board. See

Installation and Troubleshooting Guide

"Removing the Control Panel Assembly" in your

Disconnect the power and interface cables on both hard drives from the backplane board (connectors JP1, JP2, IDE0 and IDE1).

Disconnect the power supply cable from the back of the backplane board (connector J2). See "Replacing the Power Supply" in your

If the hard-drive interface cables are routed through the backplane to a PCI controller card,

Installation and Troubleshooting Guide

disconnect these interface cables from the PCI controller card.

Remove all PCI expansion cards installed on the riser board. See "Removing an Expansion Card" in your

Disconnect the CD/diskette drive interface cable from the backplane connector CN1.

Rotate the backplane release latches up. See Figure 1-1.

Remove the power supply. See "Replacing the Power Supply" in your

Troubleshooting Guide

Remove the fan assemblies. See "Fan Assemblies" in your

Guide

Loosen the thumbscrew securing the system board to the chassis floor.

Installation and Troubleshooting Guide

Installation and

Installation and Troubleshooting

Replacing the System and Backplane Board Assemblies 3

Loosen the two thumbscrews securing the riser board and disconnect it from the system board card-edge connector. See "Removing the Riser Board" in your

Troubleshooting Guide.

Slide the backplane securing latch forward to the open position to allow the system board/backplane board to move to the forward (unlatched) position.

Slide the system board/backplane board assembly forward, toward the front of the system and lift the assembly up and out of the chassis. See Figure 1-1.

Figure 1-1. Removing the System Board/Backplane Board Assembly

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Installation and

thumbscrew

backplane release latches (2)

Lay the system board/backplane board assembly down on a smooth, nonconductive work surface.

Remove the three Phillip screws that secure the system board to the backplane board. See Figure 1-2.

4 Replacing the System and Backplane Board Assemblies

backplane securing latch

Figure 1-2. Separating the System/Backplane Board Assembly

shroud

screws (3)

system board

backplane board

power cable

Remove the power cable from the power connector on the system board. See Figure 1-2.

Release the plastic cable tie that secures the cable connector to connector U3 and remove the free end of the power cable from the backplane board (connector U3).

Pull the backplane board away from the system board. See Figure 1-2.

Installing the System/Backplane Board Assembly

CAUTION: See your System Information Guide for complete information about safety precautions,

working inside the computer, and protecting against electrostatic discharge.

NOTE: It is not necessary to remove the hard drives or the CD/diskette drive from the system during this

procedure.

To install the system board/backplane board assembly, perform the following steps:

Connect the four-conductor power cable to the back of the backplane (connector U3). Secure this connector with a plastic cable tie to the backplane.

Connect the system board to the backplane board. See Figure 1-2.

NOTICE: Use a screw only in the center screw hole to secure the system board/backplane board to the

chassis.

Using

one

secure the system board/backplane board to the chassis Figure 1-3). Discard the other two screws.

of the three Phillips screws removed in step 21 of the board removal procedure,

using the center screw hole

Replacing the System and Backplane Board Assemblies 5

(see

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