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Dell 780 service manual Removing the Intrusion Switch, Back to Contents Page

Models: 780

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Back to Contents Page

Intrusion Switch

Dell™ OptiPlex™ 780 Ultra Small Form Factor—Service Manual

WARNING: Before working inside your computer, read the safety information that shipped with your computer. For additional safety best practices information, see the Regulatory Compliance Homepage at www.dell.com/regulatory_compliance.

Removing the Intrusion Switch

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1.Follow the procedures in Before Working Inside Your Computer.

2.Remove the cover.

3.Remove the front bezel.

4.Remove the drive cage.

5.Disconnect the intrusion switch cable from the computer.

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Contents

System Board Layout System Setup Diagnostics Working on Your Computer Removing and Replacing Parts SpecificationsNotes, Cautions, and Warnings Working on Your Computer Dell OptiPlex 780 Ultra Small Form Factor-Service ManualBack to Contents Page Before Working Inside Your ComputerIn Windows Vista Turning Off Your ComputerAfter Working Inside Your Computer In Windows XP Click Start Turn Off Computer Turn OffSystem Fan Heat Sink and Processor Intrusion Switch Coin-Cell Battery Removing and Replacing PartsCover Drive Cage Optical Drive Wireless Local Area Network WLAN Card Internal Speaker Memory I/O Board Power SupplyMemory SpecificationsProcessor VideoPower External ConnectorsSystem Board Connectors DrivesEnvironmental Back to Contents PageBack to Contents Page System Board LayoutDell OptiPlex 780 Ultra Small Form Factor-Service Manual Back to Contents PageSystem Setup Screen System SetupEntering System Setup Dell OptiPlex 760 Ultra Small Form Factor-Service ManualSystem Configuration System Setup OptionsDisable USB Internal default Read Only Enable defaultFront USB Rear Dual USB Rear Quad USB PCI slots Audio Disable AT PS/2 default EPP ECP No DMA ECP DMA ECP DMACOM1 COM3 VideoPower Management Deactivate default Activate ClearDeactivate default Disable Activate Power Off defaultStatic IP DNS MaintenanceImage Server Static IPChanging the Boot Sequence for the Current Boot Boot SequenceOption Settings Enable F12 = Boot menu enabled by defaultChanging the Boot Sequence for Future Boots Booting to a USB DevicePassword Protection System PasswordDeleting or Changing an Existing System Password Assigning a System PasswordTyping Your System Password If Password Status is set to LockedOperating Your Computer With an Administrator Password Enabled Administrator PasswordAssigning an Administrator Password Deleting or Changing an Existing Administrator PasswordDisabling a Forgotten Password and Setting a New Password Jumper SettingsClearing Forgotten Passwords Jumper SettingClearing CMOS Settings Back to Contents PagePage When to Use the Dell Diagnostics DiagnosticsDell Diagnostics Starting the Dell Diagnostics From Your Hard DrivePower Light State Off Blinking Amber Solid Power Button Light CodesDell Diagnostics Main Menu OptionCode Beep CodesAmber Blinking Green Solid Green CauseProblem Description Suggested Resolution Diagnostic LightsLight Pattern Back to Contents Page Repeat this process for each expansion card installed. If the computerRemoving the Cover 1. Follow the procedures in Before Working Inside Your ComputerCover Dell OptiPlex 780 Ultra Small Form Factor-Service ManualBack to Contents Page Replacing the CoverTo replace the cover, perform the above steps in reverse order 1. Follow the procedures in Before Working Inside Your Computer Dell OptiPlex 780 Ultra Small Form Factor-Service ManualBack to Contents Page CoverBack to Contents Page Replacing the CoverDell OptiPlex 780 Ultra Small Form Factor-Service Manual Drive CageRemoving the Drive Cage Back to Contents Page5. Disconnect the power and data cables from the optical drive 6. Flip over the drive cage and place it on the computer7. Disconnect the power and data cables from the hard drive 8. Remove the drive cage from the computerBack to Contents Page Replacing the Drive CageTo replace the drive cage, perform the above steps in reverse order Back to Contents Page Optical DriveRemoving the Optical Drive 1. Follow the procedures in Before Working Inside Your ComputerReplacing the Optical Drive 6. Remove the optical-drive bracket from the optical-drive assemblyDell OptiPlex 780 Ultra Small Form Factor-Service Manual Wireless Local Area Network WLAN CardRemoving the WLAN Card Back to Contents Page7. Remove the WLAN card from the connector on the system board Back to Contents Page Replacing the WLAN CardTo replace the WLAN card, perform the above steps in reverse order Dell OptiPlex 780 Ultra Small Form Factor-Service Manual System FanRemoving the System Fan Back to Contents Page6. Release the fan cable from its routing on the computer 7. Remove the screws that secure the fan to the computer chassis8. Remove the system fan from the computer Replacing the System FanBack to Contents Page To replace the system fan, perform the above steps in reverse orderDell OptiPlex 780 Ultra Small Form Factor-Service Manual Heat Sink and ProcessorRemoving the Heat Sink and Processor Back to Contents Page6. Loosen the captive screws on the heat sink 7. Lift the heat sink out of the computer9. Open the processor cover Back to Contents Page Replacing the Heat Sink and Processor10. Remove the processor from the system board Dell OptiPlex 780 Ultra Small Form Factor-Service Manual Intrusion SwitchRemoving the Intrusion Switch Back to Contents PageReplacing the Intrusion Switch Back to Contents Page6. Remove the heat sink and processor Coin-Cell BatteryRemoving the Coin-Cell Battery Dell OptiPlex 780 Ultra Small Form Factor-Service ManualReplacing the Coin-Cell Battery 9. Lift the coin-cell battery up and remove it from the system boardRemoving the System Board 9. Remove the wireless local area network cardSystem Board 5. Remove the heat sink and processor12. Disconnect the internal antenna cable 14. Remove the 7 mm hex screw from the system board 15. Remove the system board from the computerBack to Contents Page Replacing the System BoardTo replace the system board, perform the above steps in reverse order Dell OptiPlex 780 Ultra Small Form Factor-Service Manual Front BezelRemoving the Front Bezel Back to Contents Page4. Rotate the front bezel away from the computer Replacing the Front BezelBack to Contents Page 5. Remove the front bezel from the computerDell OptiPlex 780 Ultra Small Form Factor-Service Manual Hard DriveRemoving the Hard Drive Back to Contents PageBack to Contents Page Replacing the Hard DriveTo replace the hard drive, perform the above steps in reverse order Dell OptiPlex 780 Ultra Small Form Factor-Service Manual Control PanelRemoving the Control Panel Back to Contents Page6. Remove the cable from the routing guides on the computer chassis 7. Remove the screw that secures the control panel to the computerBack to Contents Page Replacing the Control Panel8. Remove the control panel from the computer Dell OptiPlex 780 Ultra Small Form Factor-Service Manual Internal Antenna CableRemoving the Internal Antenna Cable Back to Contents PagePage Back to Contents Page Replacing the Internal Antenna Cable8. Remove the internal antenna cable from the computer Dell OptiPlex 780 Ultra Small Form Factor-Service Manual Internal SpeakerRemoving the Internal Speaker Back to Contents PageReplacing the Internal Speaker Dell OptiPlex 780 Ultra Small Form Factor-Service Manual MemoryRemoving the Memory Modules Back to Contents PageBack to Contents Page Replacing the Memory ModulesTo replace the memory, perform the above steps in reverse order Back to Contents Page I/O PanelRemoving the I/O Panel 1. Follow the procedures in Before Working Inside Your Computer7. Remove the I/O board by pulling it away from the computer Back to Contents Page Replacing the I/O PanelTo replace the I/O panel, perform the above steps in reverse order 5. Remove the intrusion switch 6. Remove the heat sink and processor Power SupplyRemoving the Power Supply Dell OptiPlex 780 Ultra Small Form Factor-Service Manual8. Remove the screw that secures the power supply to the system board Replacing the Power Supply