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

	Overview		System Board Jumpers
	Internal Views		System Board Labels
	System Board Components		Removing and Replacing the Riser Board Bracket

Overview

This section describes the inside of your computer as a reference for you to use before you perform an upgrade procedure. Before you remove the computer cover, see "Safety First—For You and Your Computer" and "Removing and Replacing the Computer Cover."

Internal Views

Figure 1 show a top view of the chassis to help orient you when you work inside the computer.

Figure 1. Chassis Orientation View

1 System board 2 Diskette drive 3 Optical drive

Figure 2 shows the chassis with the cover removed.

Figure 2. Inside the Chassis

1 Optical drive 2 Diskette drive 3 Riser board bracket 4 System board 5 Riser board securing tab 6 Riser board 7 Expansion card slot 8 Expansion card 9 I/O ports and connectors 10 Power supply

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 layout of 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.

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

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

Table 1. System-Board Jumper Settings

Jumper	Setting	Description
JP6	(default)	System password features enabled. Bypass system password features.
JP7*	(default)	Normal boot setting. Boot from top block setting.
JPX1*	(default)	Processor normal mode enabled. Processor safe mode enabled.
JPX2*	(default)	Retains current NVRAM settings. Clears NVRAM.
* Change this setting only if instructed to by Dell Technical Support.

System Board Labels

Table 2 lists the labels for light-emitting diode (LED) indicators, connectors, and sockets on the system board, and it gives a brief description of their functions.

Table 2. System Board and Front Audio/USB Board Indicators, Connectors, and Sockets

Removing and Replacing the Riser Board Bracket

Certain system board upgrades require that you remove and replace the riser board bracket.

To remove the riser board bracket, 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 and Replacing the Computer Cover."

2. Remove the screw that secures the riser board bracket to the riser board (see Figure 5).

3. Hold the back of the diskette drive to prevent it from moving.

CAUTION: When handling the riser board bracket, always hold it by placing a finger through the oval hole in the bracket. Do not grasp the bracket by its edges, which may be sharp.

4. Hold the riser board bracket by placing your finger in the oval hole, and slightly lift the back end of the riser board bracket to disengage the fingers on the bracket from the holes in the back of the chassis.
   
   
5. Gently pull the riser board bracket toward the back of the computer until its front tab is free from the chassis and its three diskette drive tabs are clear of the corresponding slots on the chassis (see Figure 5).
   
   

Figure 5. Removing the Riser Board Bracket

1 Diskette drive tab (3) 2 Front tab 3 Riser board bracket 4 Outer riser-board securing tab 5 Inner riser-board securing tab 6 Screw 7 Fingers 8 Oval hole

To replace the riser board bracket, perform the following steps:

1. With one hand, hold the back of the diskette drive to prevent it from moving.

CAUTION: When handling the riser board bracket, always hold it by placing a finger through the oval hole in the bracket. Do not grasp the bracket by its edges, which may be sharp.

2. Hold the riser board bracket by placing your finger in the oval hole, and position the bracket over the diskette drive.
   
   
3. Align the bracket's inner and outer riser-board securing tabs over the riser board (see Figure 5).
   
   
4. Align the three diskette drive tabs with the corresponding slots on the chassis.
   
   
5. Slide the riser board bracket toward the front of the chassis until the fingers on the back of the bracket snap into the holes on the back of the chassis.
   
   
6. Replace the screw that secures the riser board bracket to the riser board.
   
   
7. Replace the computer cover.

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