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Dell Removing the Power Supply, Dell OptiPlex 780 Ultra Small Form Factor-Service Manual

Models: 780

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Power Supply

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 Power Supply

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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.Remove the intrusion switch.

6.Remove the heat sink and processor.

7.Disconnect the power cables from the system board.

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Dell 780 service manual Removing the Power Supply, Remove the intrusion switch 6. Remove the heat sink and processor

Contents

Notes, Cautions, and Warnings Working on Your Computer Removing and Replacing Parts SpecificationsSystem Board Layout System Setup Diagnostics Before Working Inside Your Computer Dell OptiPlex 780 Ultra Small Form Factor-Service ManualBack to Contents Page Working on Your ComputerIn Windows XP Click Start Turn Off Computer Turn Off Turning Off Your ComputerAfter Working Inside Your Computer In Windows VistaInternal Speaker Memory I/O Board Power Supply Removing and Replacing PartsCover Drive Cage Optical Drive Wireless Local Area Network WLAN Card System Fan Heat Sink and Processor Intrusion Switch Coin-Cell BatteryVideo SpecificationsProcessor MemoryDrives External ConnectorsSystem Board Connectors PowerBack to Contents Page EnvironmentalBack to Contents Page System Board LayoutDell OptiPlex 780 Ultra Small Form Factor-Service Manual Back to Contents PageDell OptiPlex 760 Ultra Small Form Factor-Service Manual System SetupEntering System Setup System Setup ScreenEnable default System Setup OptionsDisable USB Internal default Read Only System ConfigurationVideo Disable AT PS/2 default EPP ECP No DMA ECP DMA ECP DMACOM1 COM3 Front USB Rear Dual USB Rear Quad USB PCI slots AudioPower Off default Deactivate default Activate ClearDeactivate default Disable Activate Power ManagementStatic IP MaintenanceImage Server Static IP DNSEnable F12 = Boot menu enabled by default Boot SequenceOption Settings Changing the Boot Sequence for the Current BootSystem Password Booting to a USB DevicePassword Protection Changing the Boot Sequence for Future BootsIf Password Status is set to Locked Assigning a System PasswordTyping Your System Password Deleting or Changing an Existing System PasswordDeleting or Changing an Existing Administrator Password Administrator PasswordAssigning an Administrator Password Operating Your Computer With an Administrator Password EnabledJumper Setting Jumper SettingsClearing Forgotten Passwords Disabling a Forgotten Password and Setting a New PasswordBack to Contents Page Clearing CMOS SettingsPage Starting the Dell Diagnostics From Your Hard Drive DiagnosticsDell Diagnostics When to Use the Dell DiagnosticsOption Power Button Light CodesDell Diagnostics Main Menu Power Light State Off Blinking Amber SolidCause Beep CodesAmber Blinking Green Solid Green CodeLight Pattern Diagnostic LightsProblem Description Suggested Resolution Repeat this process for each expansion card installed. If the computer Back to Contents PageDell OptiPlex 780 Ultra Small Form Factor-Service Manual 1. Follow the procedures in Before Working Inside Your ComputerCover Removing the CoverTo replace the cover, perform the above steps in reverse order Replacing the CoverBack to Contents Page Cover Dell OptiPlex 780 Ultra Small Form Factor-Service ManualBack to Contents Page 1. Follow the procedures in Before Working Inside Your ComputerReplacing the Cover Back to Contents PageBack to Contents Page Drive CageRemoving the Drive Cage Dell OptiPlex 780 Ultra Small Form Factor-Service Manual6. Flip over the drive cage and place it on the computer 5. Disconnect the power and data cables from the optical drive8. Remove the drive cage from the computer 7. Disconnect the power and data cables from the hard driveTo replace the drive cage, perform the above steps in reverse order Replacing the Drive CageBack to Contents Page 1. Follow the procedures in Before Working Inside Your Computer Optical DriveRemoving the Optical Drive Back to Contents Page6. Remove the optical-drive bracket from the optical-drive assembly Replacing the Optical DriveBack to Contents Page Wireless Local Area Network WLAN CardRemoving the WLAN Card Dell OptiPlex 780 Ultra Small Form Factor-Service Manual7. Remove the WLAN card from the connector on the system board To replace the WLAN card, perform the above steps in reverse order Replacing the WLAN CardBack to Contents Page Back to Contents Page System FanRemoving the System Fan Dell OptiPlex 780 Ultra Small Form Factor-Service Manual7. Remove the screws that secure the fan to the computer chassis 6. Release the fan cable from its routing on the computerTo replace the system fan, perform the above steps in reverse order Replacing the System FanBack to Contents Page 8. Remove the system fan from the computerBack to Contents Page Heat Sink and ProcessorRemoving the Heat Sink and Processor Dell OptiPlex 780 Ultra Small Form Factor-Service Manual7. Lift the heat sink out of the computer 6. Loosen the captive screws on the heat sink9. Open the processor cover 10. Remove the processor from the system board Replacing the Heat Sink and ProcessorBack to Contents Page Back to Contents Page Intrusion SwitchRemoving the Intrusion Switch Dell OptiPlex 780 Ultra Small Form Factor-Service ManualBack to Contents Page Replacing the Intrusion SwitchDell OptiPlex 780 Ultra Small Form Factor-Service Manual Coin-Cell BatteryRemoving the Coin-Cell Battery 6. Remove the heat sink and processor9. Lift the coin-cell battery up and remove it from the system board Replacing the Coin-Cell Battery5. Remove the heat sink and processor 9. Remove the wireless local area network cardSystem Board Removing the System Board12. Disconnect the internal antenna cable 15. Remove the system board from the computer 14. Remove the 7 mm hex screw from the system boardTo replace the system board, perform the above steps in reverse order Replacing the System BoardBack to Contents Page Back to Contents Page Front BezelRemoving the Front Bezel Dell OptiPlex 780 Ultra Small Form Factor-Service Manual5. Remove the front bezel from the computer Replacing the Front BezelBack to Contents Page 4. Rotate the front bezel away from the computerBack to Contents Page Hard DriveRemoving the Hard Drive Dell OptiPlex 780 Ultra Small Form Factor-Service ManualTo replace the hard drive, perform the above steps in reverse order Replacing the Hard DriveBack to Contents Page Back to Contents Page Control PanelRemoving the Control Panel Dell OptiPlex 780 Ultra Small Form Factor-Service Manual7. Remove the screw that secures the control panel to the computer 6. Remove the cable from the routing guides on the computer chassis8. Remove the control panel from the computer Replacing the Control PanelBack to Contents Page Back to Contents Page Internal Antenna CableRemoving the Internal Antenna Cable Dell OptiPlex 780 Ultra Small Form Factor-Service ManualPage 8. Remove the internal antenna cable from the computer Replacing the Internal Antenna CableBack to Contents Page Back to Contents Page Internal SpeakerRemoving the Internal Speaker Dell OptiPlex 780 Ultra Small Form Factor-Service ManualReplacing the Internal Speaker Back to Contents Page MemoryRemoving the Memory Modules Dell OptiPlex 780 Ultra Small Form Factor-Service ManualTo replace the memory, perform the above steps in reverse order Replacing the Memory ModulesBack to Contents Page 1. Follow the procedures in Before Working Inside Your Computer I/O PanelRemoving the I/O Panel Back to Contents Page7. Remove the I/O board by pulling it away from the computer To replace the I/O panel, perform the above steps in reverse order Replacing the I/O PanelBack to Contents Page Dell OptiPlex 780 Ultra Small Form Factor-Service Manual Power SupplyRemoving the Power Supply 5. Remove the intrusion switch 6. Remove the heat sink and processor8. Remove the screw that secures the power supply to the system board Replacing the Power Supply