Dell C521 specifications Removing the Computer Cover

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Removing the Computer Cover

Dell™ Dimension™ C521 Service Manual

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.

CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.

NOTICE: Before touching anything inside your computer, ground yourself by touching an unpainted metal surface, such as the metal at the back of the computer. While you work, periodically touch an unpainted metal surface to dissipate any static electricity that could harm internal components.

1. Follow the procedures in Before You Begin.

NOTICE: Ensure that sufficient space exists to support the removed cover—at least 30 cm (1 ft) of desk top space.

NOTICE: Ensure that you are working on a level, protected surface to avoid scratching either the computer or the surface on which it is resting.

2.If you have installed a padlock through the padlock ring on the back panel, remove the padlock.

3.Locate the cover release latch shown in the illustration. Then, slide the release latch back as you lift the cover.

1

computer cover

2

cover release latch

3

security cable slot

 

 

 

 

 

 

4.Grip the sides of the computer cover and pivot the cover up using the hinge tabs as leverage points.

5.Remove the cover from the hinge tabs and set it aside on a soft nonabrasive surface.

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Contents September 2006 Rev. A00 About Your Computer Front ViewBack Panel I/O Connectors Back View of the ComputerBack to Contents Before You Begin Getting StartedRecommended Tools Turning Off Your ComputerPage Replacing the Computer Cover Removing the Computer Cover DDR2 Memory Overview Removing and Installing PartsMemory Installing Memory Cards Removing MemoryInstalling an Expansion Card Removing an Expansion Card Drives General Installation Guidelines Drive Interface ConnectorsPower Cable Connector Connecting and Disconnecting Drive CablesRemoving a CD/DVD Drive Installing a CD/DVD DriveCD/DVD Drive Floppy Drive Removing a Floppy DriveInstalling a Floppy Drive Media Card Reader Removing a Media Card ReaderInstalling a Media Card Reader Hard Drive Removing a Hard DriveInstalling a Hard Drive Battery Replacing the BatteryProcessor Removing the ProcessorInstalling the Processor Page Power Supply Replacing the Power SupplyFront I/O Panel Removing the Front I/O PanelRemoving the Fan Assembly Fan AssemblyInstalling the Front I/O Panel Removing the System Board Installing the Fan AssemblySystem Board Replacing the System Board Page Specifications Controls and Lights ConnectorsDrives Environmental PowerPhysical System Setup Entering System SetupOverview OverviewSystem Setup Options System64MB Boot Menu Post BehaviorClearing Forgotten Passwords and Cmos Settings Jumper Locations Clearing Password SettingsFlashing the Bios Clearing Cmos SettingsSystem Board Components Technical OverviewInside View of Your Computer Jumper Settings Jumper Setting DescriptionPin Number Signal name AWG Wire Power Supply DC Connector Pin AssignmentsDC Power Connector P1 DC Power Connector P2 DC Power Connector P3DC Power Connector P4 DC Power Connector P5 and P6Black +12 VDC Yellow September 2006 Rev. A00 Troubleshooting Dell DiagnosticsWhen to Use the Dell Diagnostics Dell Diagnostics Main MenuDiagnostic Lights Power Light Problem Description Suggested ResolutionProblem Description Suggested Resolution System LightsBeep Codes Code Cause