Before You Begin
Dell™ Latitude™ D420 Service Manual
Before Working Inside Your Computer
This chapter provides procedures for removing and installing the components in your computer. Unless otherwise noted, each procedure assumes that the
following conditions exist:
l
You have performed the steps in
Before Working Inside Your Computer
l
You have read the safety information in the Dell™
Product Information Guide.
l
A component can be replaced or
—
if purchased separately
—
installed by performing the removal procedure in reverse order.
Recommended Tools
The procedures in this document may require the following tools:
l
Small flat-blade screwdriver
l
Phillips screwdriver
l
Small plastic scribe
l
Flash BIOS update program CD
Turning Off Your Computer
1.
Shut down the operating system:
Save and close all open files, exit all open programs, click
Start
®
Shut Down
®
Shut down
.
The computer turns off after the operating system shutdown process is complete.
2.
Ensure that the computer and all attached devices are turned off. If your computer and attached devices did not automatically turn off when you shut
down your operating system, press and hold the power button for 4 seconds.
Before Working Inside Your Computer
Use the following safety guidelines to help protect your computer from potential damage and to help to ensure your own personal safety.
1.
Ensure that the work surface is flat and clean to prevent the computer cover from being scratched.
2.
Turn off your computer (see
).
3.
If the computer is connected to a docking device (docked), undock it. See the documentation that came with your docking device for instructions.
NOTICE:
To avoid losing data, save and close all open files and exit all open programs before you turn off your computer.
CAUTION:
Before you begin any of the procedures in this section, follow the safety instructions in the
Product Information Guide
.
NOTICE:
Handle components and cards with care. Do not touch the components or contacts on a card. Hold a card by its edges or by its metal
mounting bracket. Hold a component such as a processor by its edges, not by its pins.
NOTICE:
Only a certified service technician should perform repairs on your computer. Damage due to servicing that is not authorized by Dell is not
covered by your warranty.
NOTICE:
When you disconnect a cable, pull on its connector or on its pull-tab, not on the cable itself. Some cables have connectors with locking tabs; if
you are disconnecting this type of cable, press in on the locking tabs before you disconnect the cable. As you pull connectors apart, keep them evenly
aligned to avoid bending any connector pins. Also, before you connect a cable, ensure that both connectors are correctly oriented and aligned.
NOTICE:
To avoid damaging the computer, perform the following steps before you begin working inside the computer.
NOTICE:
To disconnect a network cable, first unplug the cable from your computer and then unplug the cable from the network device.
