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Mini Tower Chassis — RemovingandReplacingParts:DellPrecision™WorkStation420 Systems Service Manual

Overview

This section provides procedures for removing and replacing the components, assemblies, and subassemblies in the Dell Precision WorkStation
420 mini tower chassis system.
Unless otherwise noted, each procedure assumes that the following conditions exist:
lYou have performed the steps in "Precautionary Measures."
lYou have removed the computer cover.
lYou can replace or reinstall a part by performing the removal procedure in reverse order unless additional information is provided.

Recommended Tools

Most of the procedures in this file require the use of one or more of the following tools:
lWide flat-blade screwdriver
l#2 Phillips-head screwdriver
lA wrist grounding strap as explained in "Precautionary Measures."

Precautionary Measures

Before you perform any procedure in this section, take a few moments to read the following caution for your personal safety and to prevent
damage to the system from electrostatic discharge (ESD).
Overview
Expansion Cards
Recommended Tools
Expansion-Card Guide and Fan
Precautionary Measures
Control Panel
Restarting the System
Chassis Intrusion Switch
Computer Cover
Power Supply
Interior Service Label
System Board Components
Internal View
RIMMs
Front Panel
Microprocessor/Heat Sink Assembly
Front-Panel Inserts
Microprocessor Cooling Fan
Drives
Battery
AGP Card Brace
System Board
CAUTION: FOR YOUR PERSONAL SAFETY AND PROTECTION OF THE EQUIPMENT
Before you start to work on the system, perform the following steps in the sequence listed:
1. Turn off the computer and all peripherals.
2. Disconnect the computer and peripherals from their AC power sources. Also, disconnect any telephone or telecommunication lines
from the computer. Doing so reduces the potential for personal injury or shock.
3. If you are disconnecting a peripheral from the computer or are removing a component from the system board, wait 10 to 20 seconds
after disconnecting the computer from AC power before disconnecting the peripheral or removing the component to avoid possible