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Inside Your Computer: Dell™ OptiPlex™ GX300 System User's Guide

	Overview		System Board Labels
	Internal Views		Removing and Replacing the AGP Card Brace
	System Board Components		Rotating the Power Supply Away From the System Board
	System Board Jumpers		Removing and Replacing the Front Bezel

Overview

This section describes the inside of your computer and may be used as a reference before performing an upgrade procedure.

CAUTION: Before working inside your computer, see "Safety First—For You and Your Computer."

Internal Views

Figure 1 shows a side view of your computer to help you orient yourself when working inside the computer.

Figure 1. Computer Orientation View

1 Power supply 2 System board 3 Externally accessible drives 4 Hard-disk drives

Figure 2 shows your computer with its cover removed.

Figure 2. Inside the Chassis

1 Power supply 2 AC power receptacle 3 I/O panel connectors 4 expansion card slots 5 Padlock ring 6 Security cable slot 7 AGP card brace 8 Drive interface cable 9 Chassis intrusion switch 10 Hard-disk drive cage 11 Externally accessible drive bays

System Board Components

Figure 3 shows the system board and the location of all its sockets and connectors.

Figure 3. System Board Components

System Board Jumpers

Figure 4 shows the location of the jumpers on the system board. Table 1 lists the system board jumpers and their settings.

Figure 4. System Board Jumpers

Jumpers are small blocks on a circuit board with two or more pins emerging from them. Plastic plugs containing a wire fit down over the pins. The wire connects the pins and creates a circuit.

NOTICE: Make sure your system is turned off before you change a jumper setting. Otherwise, damage to your system or unpredictable results may occur.

To change a jumper setting, pull the plug off its pin(s) and carefully fit it down onto the pin(s) indicated.

Table 1. System-Board Jumper Settings

Jumper	Setting	Description
PSWD	(default)	Password features are enabled. Password features are disabled.
RTCRST		Real-time clock reset. Can be used for troubleshooting purposes.
jumpered   unjumpered

System Board Labels

Table 2 lists the labels for connectors and sockets on your system board, and it gives a brief description of their functions.

Table 2. System Board Connectors and Sockets

Removing and Replacing the AGP Card Brace

To access any expansion cards or components on the system board, you must first remove the AGP card brace that secures an AGP card in the AGP socket.

CAUTION: Before you remove the computer cover, see "Safety First—For You and Your Computer."

1. Remove the computer cover.

2. Remove the screw securing the AGP card brace to the chassis (see Figure 5).

Figure 5. Removing the AGP Card Brace

1 Card guide 2 AGP card brace 3 Screw 4 Plastic AGP card guide 5 Tab 6 Slot

3. Rotate the brace up until it disengages from the card guide at the front of the chassis. Then lift it away from the chassis.

To replace the brace, perform the following steps:

1. Insert the tabs on one end of the brace into the slots on the card guide at the front of the chassis (see Figure 5).
   
   
2. Lower the brace, ensuring that the plastic AGP card guide on the bottom of the brace is engaged with the top of the AGP card.
   
   
3. Replace the screw that secures the brace to the chassis.

Rotating the Power Supply Away From the System Board

To access some components on the system board, you may have to rotate the system power supply out of the way. To rotate the power supply, perform the following steps:

CAUTION: Before you remove the computer cover, see "Safety First—For You and Your Computer."

1. Remove the computer cover as instructed in "Removing the Computer Cover."

2. Disconnect the AC power cable from the AC power receptacle on the back of the power supply (see Figure 6).

Figure 6. Rotating the Power Supply

1 Power supply 2 Release latch 3 AC power cable 4 Securing tab 5 DC power cable

3. Free the power supply from the securing tab labeled "RELEASE - >, " and rotate it upward until it locks in its extended position.

Removing and Replacing the Front Bezel

To access some drive bays, you must first remove the front bezel. To remove the front bezel, you first must remove the computer cover (see "Removing and Replacing the Computer Cover"). With the cover removed, release the bezel by pressing the tab release marked with the icon (see Figure 7).

Figure 7. Removing the Front Bezel

1 Tab release 2 Retaining hooks (2)

While pressing the tab release, tilt the bezel away from the chassis, disengage the two retaining hooks at the bottom of the bezel, and carefully pull the bezel away from the chassis.

To replace the bezel, fit the two retaining hooks on the bezel into their corresponding slots at the bottom of the chassis. Then rotate the top of the bezel toward the chassis until the top tabs snap into their corresponding slots on the bezel.

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