Dell Precision WorkStation 420 Service Manual page 24

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Mini Tower Chassis — Removing and Replacing Parts: Dell Precision™ WorkStation
420 Systems Service Manual
Overview
Recommended Tools
Precautionary Measures
Restarting the System
Computer Cover
Interior Service Label
Internal View
Front Panel
Front-Panel Inserts
Drives
AGP Card Brace
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:
You have performed the steps in
l
You have removed the computer
l
You can replace or reinstall a part by performing the removal procedure in reverse order unless additional information is provided.
l
Recommended Tools
Most of the procedures in this file require the use of one or more of the following tools:
Wide flat-blade screwdriver
l
#2 Phillips-head screwdriver
l
A wrist grounding strap as explained in
l
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).
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
"Precautionary Measures."
cover.
"Precautionary Measures."
Expansion Cards
Expansion-Card Guide and Fan
Control Panel
Chassis Intrusion Switch
Power Supply
System Board Components
RIMMs
Microprocessor/Heat Sink Assembly
Microprocessor Cooling Fan
Battery
System Board