Dell 990 service manual Removing The Power Supply

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Power Supply

Removing The Power Supply

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

2.Remove the cover.

3.Remove the PSU thermal sensor.

4.Disconnect the 4–pin power cable from the system board.

5.Unthread the 4–pin power cable from the chassis clips.

6.Disconnect the 24–pin power cable from the system board.

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Contents Regulatory Model D05D Regulatory Type D05D001 Page Contents Coin-Cell Battery Chassis Intrusion SwitchPower-Switch Cable SpeakerPower Supply Unit PSU Thermal Sensor Power SupplySystem Setup TroubleshootingNo timer tick interrupt Memory allocation errorDecreasing available memory Diskette read failureContacting Dell SpecificationsPage Before Working Inside Your Computer Working on Your ComputerTurning Off Your Computer Recommended ToolsAfter Working Inside Your Computer Page Cover Installing The CoverRemoving the Cover Follow the procedures in After Working Inside Your Computer Removing the Front Bezel Front BezelInstalling The Front Bezel Removing the Expansion Card CardsPage Installing The Expansion Card Page Removing the Optical Drive Optical DriveInstalling The Optical Drive Removing the Hard Drive Hard DrivePage Installing The Hard Drive Page Removing the Memory MemoryInstalling The Memory Removing the Chassis Intrusion Switch Chassis Intrusion SwitchInstalling The Chassis Intrusion Switch Removing The Speaker SpeakerInstalling The Speaker Removing The Heat Sink and Processor Heat SinkPage Installing The Heat Sink and Processor Page Removing The Coin-Cell Battery Coin-Cell BatteryInstalling The Coin-Cell Battery Removing The Power-Switch Cable Power-Switch CableInstalling The Power-Switch Cable Removing The Front Thermal Sensor Front Thermal SensorInstalling The Front Thermal Sensor Removing The System Fan Chassis FanInstalling The System Fan Follow the procedures in After Working Inside Your Computer Page Removing The Input/Output Panel Input/Output PanelRemove the Input/Output panel Installing The Input/Output PanelRemoving The Power Supply Power SupplyPage Lift the power supply out of the computer Installing The Power SupplyPage Removing The System Board System BoardInstalling The System Board Follow the procedures in After Working Inside Your Computer Page Removing The PSU Thermal Sensor Power Supply Unit PSU Thermal SensorInstalling The PSU Thermal Sensor System Setup System SetupBoot Menu Boot Menu EnhancementsTiming Key Sequences System Setup Options Beep Codes and Text Error MessagesNavigation SATA-2, SATA-3, and LOM MAC Address TechnologySystem Configuration Security VideoAllow Non-Admin Password Changes This option is Performance Protector or if Auto Power is set to disabled Power ManagementPost Behavior Enable F12 Boot menu enabled by defaultVirtualization Support MaintenanceImage Server Address is255.255.255.255 Setting isSystem Logs Clear Log Displays the Bios Progress event logPage Diagnostic LEDs TroubleshootingDiagnostic Light Patterns Power Button ProblemSteps Power ButtonPower Button Problem Description LED Troubleshooting Steps Re-seat the processor If the problem persists, the system board is faultyTroubleshooting Steps Possible expansion card failure has occurred Your computerCode1-1-2 Beep CodesCode Cause CauseCode Cause DMA page register read/write failure Through CodeCause Keyboard Controller Test failure Code Address mark not found Error MessagesCode Cause Cache test failure Bad command or file name Alert! Security override Jumper is installedBad error-correction code ECC on disk read Data errorHard-disk drive configuration error Diskette subsystem reset failedDecreasing available memory Diskette drive 0 seek failureInvalid Memory configuration, please populate DIMM1 Invalid configuration information-please run Setup programHard-disk drive controller failure Hard-disk drive failureMemory size in Cmos invalid Memory allocation errorNo boot sector on hard-disk drive No boot device availableNo timer tick interrupt Non-system disk or disk errorReset failed Read faultSeek error Requested sector not foundTimer chip counter 2 failed Time-of-day not set-please run the System Setup programUnexpected interrupt in protected mode Write fault\ is not accessible. The device is not ready Write fault on selected drivePage Technical Specifications SpecificationsProcessor TypeNetwork AudioSystem Information Expansion BusPCI Drives External ConnectorsSystem Board Connectors ConnectorFactor Back Panel Ultra Small Form Factor Front Panel Video Vary based on the graphics cardSmall Form Factor Ultra Small Form Factor Controls and Lights System power supply Power system byTurned on and is functional. OutletPhysical Height Width Depth Weight Power Wattage Maximum Voltage Heat DissipationEnvironmental Airborne contaminant level Storage Grms Maximum shock Operating 40 G 105 G AltitudeS71.04-1985 102Contacting Dell Contacting DellVisit support.dell.com