Dell 100-Mbps manual System Overview

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Chapter 1

System Overview

This service manual covers the Dell®OptiPlex ®GXpro high-speed, upgrad- able desktop systems, which use the Intel®Pentium®Pro family of microprocessors. These Dell systems incorporate the high-performance PCI local bus as well as the ISA expansion bus. These buses are built into the system board, which also integrates a 3.3-V Pentium Pro microprocessor and all other elements of the basic computer system.

The Pentium Pro microprocessor contains a built-in clock multiplier circuit, which increases the microprocessor’s internal operating frequency to a multiple of the system clock frequency. The microprocessors for each of these systems and their operating frequencies are as follows:

Dell OptiPlex GXpro 180 systems — 180 MHz derived from a system clock frequency of 60 MHz

Dell OptiPlex GXpro 200 systems — 200 MHz derived from a system clock frequency of 66 MHz

Dell OptiPlex GXpro systems contain either an integrated 10-Mbps or 10/100-Mbps 3Com® NIC, both of which are covered in this document.

System Overview

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Contents 659,&0$18$ Page Contents Chapter Basic Troubleshooting Chapter Beep Codes and Error MessagesChapter Removing and Replacing Parts Figures Index16. Expansion-Card Cage Removal TablesPage Read This First System Overview System Features System Unit Orientation Front-Panel Features Advanced Expansion Subsystem Dual-Processor CapabilityEnhanced Dual-Interface Eide Subsystem Hard-Disk Drive OptionsAudio Controller PCI Video CardThermal Monitoring Desktop ChassisPin Assignments for the DC Power Connectors System Power SupplySystem Unit Smart SupportDC Power Connector P1 DC Power Connector P7 DC Power DistributionPower Distribution Video Memory System Board LayoutSystem Board Jumpers Main MemoryJumper Descriptions Interrupt AssignmentsIRQ14 DMA Channel AssignmentsTechnical Specifications Technical SpecificationsNIC CtrlAltEnter To 149 F Page Initial User Contact Basic TroubleshootingExternal Visual Inspection Observing the Boot Routine Internal Visual Inspection Eliminating Resource Conflicts Running the Diskette-Based DiagnosticsGetting Help Post Beep Codes Beep Codes and Error MessagesPost Beep Codes Halted System Error MessagesSystem Error Messages System could not suc System Setup program Incorrect configuration During memory test Faulty or improperly System does not recog Faulty diskette, diskette MS-DOS unable to Defective sectors on dis At system start-up One or both micro Recommended Tools Removing and Replacing PartsProtection of the Equipment Precautionary MeasuresPull the floor stand away from the system unit Floor StandSystem-Unit Cover Removal System Unit CoverEject, Power, and Reset Button Removal Eject, Power, and Reset ButtonsFront-Panel Insert Removal Front-Panel InsertsIndicator Card Removal Indicator CardSpeaker Removal SpeakerDrive Hardware Drives5-Inch Diskette Drive Removal Drives in the Drive Cage10 .25-Inch Drive Removal Lift the hard-disk drive bracket out of the system unit Hard-Disk Drives12. Hard-Disk Drive Removal 13. Power Supply Removal System Power Supply14. Microprocessor Fan Removal Microprocessor Fan15. System Board Components System Board ComponentsExpansion-Card Cage Expansion Cards17. Expansion-Card Removal Expansion Card18. Riser Board Removal Riser Board19. Dimm Removal DIMMs21. Microprocessor Securing Clip Microprocessor/Heat Sink Assembly22. Microprocessor Removal Terminator Card Terminator or Add-In Card24. Add-In Card Removal Add-In CardRemove the battery System BatteryRemove the system board as follows System BoardSystem Setup Program USB System Setup ScreensTable A-1. System Setup Categories Be shadowed or cached. If video problems Check the monitor documentation to make Table A-1. System Setup Categories Index Dskt connector, 1-12,4-16dual-processing,1-5 ECC DIMMs LINE-IN connector, 1-12,4-16 USB description Location, 1-4,1-12