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 Before You Begin

Dell™Latitude™D520ServiceManual

Recommended Tools

Turning Off Your Computer

Before Working Inside Your Computer

Computer Orientation

Screw Identification

This section 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 Turning Off Your Computer and 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 any open files, exit any open programs, click Start® Shut Down® Shut down.

The computer turns off after the operating system shutdown process finishes.



2. Ensure that the computer and any 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 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 Turning Off Your Computer).



3. Disconnect any telephone or network cables from the computer.

NOTICE: To avoid losing data, save and close any open files and exit any 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 a connector 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 help prevent damage to 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 it from the network device.

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