Dell E521 specifications Power Supply, Replacing the Battery

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12.When you restart your computer, enter system setup (see System Setup), and select the appropriate Drive option.

See the documentation that came with the drive for instructions on installing any software required for drive operation.

13.Verify that your computer works correctly by running the Dell Diagnostics (see Dell Diagnostics).

Battery

Replacing the Battery

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

NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of your computer's electronic components. You can do so by touching an unpainted metal surface on the computer chassis.

A coin-cell battery maintains computer configuration, date, and time information. The battery can last several years.

If you have to repeatedly reset time and date information after turning on the computer, replace the battery.

CAUTION: A new battery can explode if it is incorrectly installed. Replace the battery only with the same or equivalent type recommended by the manufacturer. Discard used batteries according to the manufacturer's instructions.

To replace the battery:

1.Record all the screens in system setup (see System Setup) so that you can restore the correct settings in step 9.

2.Follow the procedures in Before You Begin.

3.Remove the computer cover (see Removing the Computer Cover).

4.Locate the battery socket (see System Board Components).

5.Carefully press the battery release lever away from the battery and the battery will pop out.

6.Insert the new battery into the socket with the side labeled "+" facing up, then snap the battery into place.

1

battery release lever

2

battery (positive side)

 

 

 

 

7. Replace the computer cover (see Installing the Computer Cover).

NOTICE: To connect a network cable, first plug the cable into the network device and then plug it into the computer.

8.Connect your computer and devices to electrical outlets, and then turn them on.

9.Enter system setup (see System Setup) and restore the settings you recorded in step 1. Then go to the Maintenance section and clear the low battery and other errors associated with the battery replacement in the Event Log.

10.Properly dispose of the old battery.

See the Product Information Guide for battery disposal information.

Power Supply

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Contents Model Dcsm About Your Computer Front View of the ComputerBack Panel Connectors Back View of the ComputerBack to Contents Diagnostic Lights Advanced TroubleshootingPower Lights Light Pattern Problem Description Suggested ResolutionCode Cause Beep CodesSystem Messages Click the Change or Remove Program icon Diskette read failureDell Diagnostics Starting the Dell DiagnosticsDrivers Dell Diagnostics Main MenuWhat Is a Driver? Identifying DriversManually Reinstalling Drivers Reinstalling DriversUsing Windows XP Device Driver Rollback Windows XPResolving Software and Hardware Incompatibilities Click Start, then click Help and SupportRecommended Tools Before You BeginGetting Started Turning Off Your ComputerBack to Contents Removing and Installing Parts Removing the Computer CoverMemory Installation Guidelines MemoryAddressing Memory With 4-GB Configurations Installing MemoryCards Removing MemoryInstalling a PCI Card PCI CardsPage Removing a PCI Card Installing a PCI Express Card PCI Express CardsPage Removing a PCI Express Card Drive Panel Removing the Drive PanelRemoving the Drive-Panel Insert Installing the Drive-Panel InsertInstalling the Drive Panel Connecting Drive Cables DrivesHard Drive Drive Interface ConnectorsConnecting and Disconnecting Drive Cables Installing a Hard Drive Removing a Hard DrivePage Floppy Drive Adding a Second Hard DriveRemoving a Floppy Drive Installing a Floppy Drive Media Card Reader Removing a Media Card ReaderInstalling a Media Card Reader CD/DVD Drive Removing a CD/DVD DriveInstalling a CD/DVD Drive Page Replacing the Battery BatteryPower Supply Replacing the Power Supply Processor Removing the ProcessorInstalling the Processor Page Panel Removing the I/O PanelRemoving the Processor Fan Installing the I/O PanelProcessor Fan Installing the Processor Fan System Board Screws System BoardRemoving the System Board Installing the Computer Cover Installing the System BoardBack to Contents September 2006 Rev. A00 Specifications Controls and Lights ConnectorsDrives Environmental PowerPhysical System Setup Screen System SetupEntering System Setup OverviewSystem Setup Options Onboard DevicesUnlocked Bypass isNot Set Changing Boot Sequence for the Current Boot Boot SequenceOption Settings Setup & Boot MenuClearing Forgotten Passwords Changing Boot Sequence for Future BootsClearing Cmos Settings Flashing the BiosClick Save this program to disk, and then click OK System Board Components Technical OverviewInside View of Your Computer Power Supply DC Connector Pin Assignments Pin Number Signal name AWG WireDC Power Connector P2 DC Power Connector P10