Dell 990 service manual Working on Your Computer, Before Working Inside Your Computer

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Working on Your Computer

Before Working Inside Your Computer

Use the following safety guidelines to help protect your computer from potential damage and to help to ensure your personal safety. Unless otherwise noted, each procedure included in this document assumes that the following conditions exist:

You have read the safety information that shipped with your computer.

A component can be replaced or--if purchased separately--installed by performing the removal procedure in reverse order.

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.

CAUTION: Many repairs may only be done by a certified service technician. You should only perform troubleshooting and simple repairs as authorized in your product documentation, or as directed by the online or telephone service and support team. Damage due to servicing that is not authorized by Dell is not covered by your warranty. Read and follow the safety instructions that came with the product.

CAUTION: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching an unpainted metal surface, such as a connector on the back of the computer.

CAUTION: Handle components and cards with care. Do not touch the components or contacts on a card. Hold a card by its edges or by its metal mounting bracket. Hold a component such as a processor by its edges, not by its pins.

CAUTION: When you disconnect a cable, pull on its connector or on its pull-tab, not on the cable itself. Some cables have connectors with locking tabs; if you are disconnecting this type of cable, press in on the locking tabs before you disconnect the cable. As you pull connectors apart, keep them evenly aligned to avoid bending any connector pins. Also, before you connect a cable, ensure that both connectors are correctly oriented and aligned.

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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 Installing The Cover 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 Beep Codes and Text Error Messages System Setup OptionsNavigation 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 isSetting is 255.255.255.255System 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 Error Messages Address mark not foundCode 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. OutletPower Wattage Maximum Voltage Heat Dissipation Physical Height Width Depth WeightEnvironmental Airborne contaminant level Storage Grms Maximum shock Operating 40 G 105 G AltitudeS71.04-1985 102Contacting Dell Contacting DellVisit support.dell.com