Dell C521 specifications Replacing the System Board

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5.Remove the memory. See Removing Memory.

Make a note of where each memory module(s) is installed so that you can reinstall the memory module(s) in the same connector.

6.Remove the processor and heat sink assembly. See Removing the Processor.

7.Remove the fan assemble. See Removing the Fan Assembly.

8.Disconnect all cables from the system board.

9.Remove the eight screws from the system board.

1

system board

2

screws (8)

 

 

 

 

10. Slide the system board assembly toward the front of the computer, and then lift the board up and away.

Place the system board assembly that you just removed next to the replacement system board to ensure it is identical.

Replacing the System Board

1.Gently align the system board into the chassis and slide it toward the back of the computer.

2.Using the eight screws, secure the system board to the chassis.

3.Replace the fan assembly. See Installing the Fan Assembly.

4.Replace the processor. See Installing the Processor.

5.Replace the memory modules. See Installing Memory.

Ensure that you install the memory modules in the same connectors as noted in step 5 of Removing the System Board.

6.Replace any removed expansion cards. See Installing an Expansion Card.

7.Replace any other components and cables that you removed from the system board.

8.Replace the computer cover. See Replacing the Computer Cover.

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

10.Verify the computer is operational by running the Dell Diagnostics. See Dell Diagnostics.

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Contents September 2006 Rev. A00 Front View About Your ComputerBack View of the Computer Back Panel I/O ConnectorsBack to Contents Turning Off Your Computer Before You BeginGetting Started Recommended ToolsPage Replacing the Computer Cover Removing the Computer Cover Memory Removing and Installing PartsDDR2 Memory Overview Installing Memory Removing Memory CardsInstalling an Expansion Card Removing an Expansion Card Drives Connecting and Disconnecting Drive Cables General Installation GuidelinesDrive Interface Connectors Power Cable ConnectorCD/DVD Drive Installing a CD/DVD DriveRemoving a CD/DVD Drive Removing a Floppy Drive Floppy DriveInstalling a Floppy Drive Removing a Media Card Reader Media Card ReaderInstalling a Media Card Reader Removing a Hard Drive Hard DriveInstalling a Hard Drive Replacing the Battery BatteryRemoving the Processor ProcessorInstalling the Processor Page Replacing the Power Supply Power SupplyRemoving the Front I/O Panel Front I/O PanelInstalling the Front I/O Panel Fan AssemblyRemoving the Fan Assembly System Board Installing the Fan AssemblyRemoving the System Board Replacing the System Board Page Specifications Drives ConnectorsControls and Lights Physical PowerEnvironmental Overview System SetupEntering System Setup OverviewSystem System Setup Options64MB Post Behavior Boot MenuJumper Locations Clearing Password Settings Clearing Forgotten Passwords and Cmos SettingsClearing Cmos Settings Flashing the BiosInside View of Your Computer Technical OverviewSystem Board Components Jumper Setting Description Jumper SettingsDC Power Connector P1 Power Supply DC Connector Pin AssignmentsPin Number Signal name AWG Wire DC Power Connector P5 and P6 DC Power Connector P2DC Power Connector P3 DC Power Connector P4Black +12 VDC Yellow September 2006 Rev. A00 Dell Diagnostics Main Menu TroubleshootingDell Diagnostics When to Use the Dell DiagnosticsSystem Lights Diagnostic LightsPower Light Problem Description Suggested Resolution Problem Description Suggested ResolutionCode Cause Beep Codes