Dell Precision 220 - Manual (Page 41)

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Inside Your Computer: Dell Precision™ WorkStation 220 System User's Guide
Overview
This section describes the inside of your computer and may be used as a reference before performing an upgrade procedure.
Safety First —For You and Your Computer
The procedures in this section require that you remove the cover and work inside your computer. While working inside your 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 your computer is safe —if you observe the following precautions.
Before you start to work on the computer, perform the following steps in the sequence indicated:
1. Turn off the computer and all peripherals.
2. Touch an unpainted metal surface on the computer chassis, such as the metal around the card-slot openings at the back of your computer,
before touching anything inside your computer.
3. Disconnect the computer and peripherals from their electrical outlets. Doing so reduces the potential for personal injury or shock. Also
disconnect any telephone or telecommunication lines from the computer.
While you work, periodically touch an unpainted metal surface on the computer chassis to dissipate any static electricity that might harm
internal components.
In addition, Dell recommends that you periodically review the safety instructions in your System Information Guide.
Removing and Replacing the Computer Cover
To remove the computer cover, perform the following steps:
1. Turn off your computer and peripherals, and observe the Caution for Your Personal Safety and Protection of the Equipment described in
" Safety First —For You and Your Computer ."
2. If you have installed a padlock through the padlock ring on the back panel, remove the padlock.
3. Remove the computer cover.
If your computer is a mini tower chassis, perform the following steps:
a. Face the back of the computer and slide the upper half of the padlock ring to the left to unlock the cover release mechanism (see
Figure 1 ).
Figure 1. Mini Tower Chassis Cover Release Mechanism
Overview System Board Jumpers
Safety First —For You and Your Computer System Board Labels
Removing and Replacing the Computer Cover Removing and Replacing the AGP Card Brace (Mini Tower
Chassis Only)
Internal Views Rotating the Power Supply Away From the System Board
System Board Components Removing and Replacing the Front Bezel
CAUTION: Before working inside your computer, see " Safety First —For You and Your Computer ."
CAUTION FOR YOUR PERSONAL SAFETY AND PROTECTION OF THE EQUIPMENT
NOTE: Before disconnecting a peripheral from the system or removing a component from the system board, verify that the
standby power light-emitting diode (LED) on the system board has turned off. For the location of this LED, see
Figure 8 ."