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Working Inside Your Computer: Dell™ PowerEdge™ 2400 Systems User's Guide

Overview • Before You Begin • Safety First—For You and the Computer • Removing and Replacing the Computer Covers • Inside the Chassis

Overview

Your Dell computer system supports a variety of internal options that expand system capabilities. This section tells you how to remove the computer cover and familiarizes you with the internal components you may handle if you install Dell hardware options. For instructions on installing internal components such as expansion cards, system board options, and tape and CD-ROM drives, see the Installation and Troubleshooting Guide.

Before You Begin

To make working inside your computer easier, make sure that you have adequate lighting and a clean work space. If you disconnect cables or remove expansion cards temporarily, note the location and orientation of each component so that you can reassemble the system correctly.

You will use the information in this section every time you install a hardware option inside your computer. Read this section carefully, because the information is not repeated elsewhere in this guide.

Safety First—For You and Your Computer

While working inside the computer, do not attempt to service the computer except as explained in this guide and elsewhere in Dell documentation. Always follow the instructions closely.

Working inside the computer is safe—if you observe the following precautions.

WARNING FOR YOUR PERSONAL SAFETY AND PROTECTION OF THE EQUIPMENT  Before starting to work on the computer, perform the following steps in the sequence listed: Turn off the computer and all peripherals. Touch an unpainted metal surface on the computer chassis, such as the power supply, before touching anything inside the computer. Disconnect the computer, peripherals, and power supplies from their electrical outlets, unless you are installing or removing a hot-pluggable component (a power supply or hard-disk drive). While you work, periodically touch an unpainted metal surface on the computer chassis to dissipate any static electricity that might harm internal components. Never place conductive objects such as tools, metal pens, or screws inside the system.

In addition, Dell recommends that you periodically review the safety instructions for this system.

Removing and Replacing the Computer Covers

The computer is enclosed by a front bezel and a left- and right-side cover. To upgrade components or troubleshoot problems inside the computer, you may need to remove the front bezel and one or both of the side covers. To access the hard-disk drives, you must remove the front bezel. Removal of the right-side computer cover allows access to the system board, small computer system interface (SCSI) backplane board, and external SCSI devices. Removal of the left-side computer cover permits access to the diskette-drive interface cable.

Removing the Computer Covers

To remove the computer covers, perform the following steps:

1. Observe the precautions in "Safety First—For You and Your Computer." Also observe the safety instructions.
2. Turn the keylock on the front bezel of the computer to the unlocked position.
3. Grasp the bezel by the indentations on each side of the external drive bays and pull it slightly away from the chassis to release the two detents on the back of the bezel.
4. Pivot the bezel downward (see Figure 1) until it is at right angles to the computer chassis.

Figure 1. Opening the Front Bezel

5. Grasp the bezel along the edge adjacent to the computer chassis and unsnap the bezel to remove it from the chassis.
6. Loosen the three thumbscrews along the front edge of either side cover (see Figure 2).

Figure 2. Removing the Computer Covers

7. Slide one cover about a centimeter (a half-inch) toward the front of the computer, and grasp the top of the cover at both ends. Rotate the top edge of the cover away from the chassis, and lift it away from the chassis.
8. Repeat steps 6 and 7 to remove the remaining side cover, if necessary.

Replacing the Computer Covers

To replace a computer cover, perform the following steps:

1. Check all cable connections, especially those that might have come loose during your work. Fold cables out of the way so that they do not catch on the computer cover.

NOTICE: Make sure that no cables or cable connectors are lying on the top diskette drive in the upper drive cage. Foreign objects on top of the drive can interfere with drive operation and permanently damage the drive.

2. Check that no tools or parts (including screws) are left inside the computer.
3. Fit the cover over the side rail at the bottom of the chassis, and slide it closed.
4. Secure the cover with the three thumbscrews.
5. Make sure that the keylock is in the unlocked position.
6. Snap the two tabs near the lower inside edge of the front bezel into the corresponding metal clips on the chassis, and pivot the bezel upwards into its closed position.
7. Set the keylock to the locked position.

Inside the Chassis

In Figure 3, the cover on the right side of the computer is removed to provide an interior view. Figure 3 also identifies the drive bays. Refer to these illustrations to locate interior features and components discussed later in this guide.

Figure 3. Inside the System (Right-Side View)

Figure 4 shows the location of the jumpers on the system board. For more information on the function of these jumpers, see "Jumpers, Switches, and Connectors" in the Installation and Troubleshooting Guide.

Figure 4. System Board Jumpers

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