Dell OptiPlex 100-Mbps User Manual

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Information in this document is subject to change without notice.



Reproduction in any m an ner whatsoever without the writt en perm ission of Dell Computer Co rporation is strictly forbidd en . Trademarks used in this text: Dell, the DELL logo, and Opt iPlex are registered trademarks of Dell Computer Corporation; Intel and Pentium are registered trademarks

of Intel Corporation; Microsoft, MS-DOS, Windows, and Windows NT are registered trademarks of Microsoft Corporation; Novell and NetW are are registered trademarks of Novell, Inc.; IBM is a registered tra de m ark of International Business Machi nes Corporation; 3Com is a registe red trademark of 3Com Corporation.

Other trademarks and tr ade names may be used in this document to refer to either the ent it ie s claiming the marks and names or their products. Dell Compu te r Corporation disclai m s a ny proprietary interest in trademarks and trade names othe r than its own.

December 1996 P/N 84577

Chapter 1

System Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

System Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Dual-Processor Capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Advanced Expansion Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Hard-Disk Drive Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Enhanced Dual-Interface EIDE Subsystem . . . . . . . . . . . . . . . . . . . . . . . 1-6

Audio Controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

PCI Video Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

NIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

USB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

Desktop Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

Thermal Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

System Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

System Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

Pin Assignments for the DC Power Connectors. . . . . . . . . . . . . . . . . 1-8

DC Power Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

System Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

Video Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

Main Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13

System Board Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13

Interrupt Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14

DMA Channel Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15

Technical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16

Chapter 2

Basic Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Initial User Contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

External Visual Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Observing the Boot Routine. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Internal Visual Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Eliminating Resource Conflicts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Running the Diskette-Based Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Getting Help. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Chapter 3

Beep Codes and Error Messages . . . . . . . . . . . . . . . . . . 3-1

POST Beep Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

System Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Chapter 4

Removing and Replacing Parts . . . . . . . . . . . . . . . . . . . 4-1

Recommended Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Precautionary Measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Floor Stand. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

System Unit Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Eject, Power, and Reset Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Front-Panel Inserts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Indicator Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Speaker. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

Drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9

Drives in the Drive Cage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

Hard-Disk Drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12

System Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14

Microprocessor Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15

System Board Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16

Expansion Cards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17

Expansion-Card Cage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17

Expansion Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18

Riser Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19

DIMMs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-20

Microprocessor/Heat Sink Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21

Terminator or Add-In Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23

Terminator Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23

Add-In Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24

System Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-25

System Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26

Appendix A

System Setup Program. . . . . . . . . . . . . . . . . . . . . . . . . . A-1

System Setup Screens. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-2

Index

Figures

Figure 1-1. System Unit Orientation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Figure 1-2. Front-Panel Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Figure 1-3. Internal View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Figure 1-4. Riser-Board Expansion-Card Connectors . . . . . . . . . . . . . . . . 1-5

Figure 1-5. DC Power Connector P1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

Figure 1-6. DC Power Connectors P2, P3, P4, P5, and P6. . . . . . . . . . . . . 1-9

Figure 1-7. DC Power Connectors P7 . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

Figure 1-8. DC Power Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

Figure 1-9. Power Distribution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

Figure 1-10. System Board Components . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

Figure 1-11. System Board Jumpers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13

Figure 4-1. Floor Stand Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Figure 4-2. System-Unit Cover Removal . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Figure 4-3. Padlock Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Figure 4-4. Eject, Power, and Reset Button Removal . . . . . . . . . . . . . . . . 4-5

Figure 4-5. Front-Panel Insert Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Figure 4-6. Indicator Card Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Figure 4-7. Speaker Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

Figure 4-8. Drive Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9

Figure 4-9. 3.5-Inch Diskette Drive Removal . . . . . . . . . . . . . . . . . . . . . 4-10

Figure 4-10. 5.25-Inch Drive Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11

Figure 4-11. Hard-Disk Drive Bracket Removal . . . . . . . . . . . . . . . . . . . . 4-12

Figure 4-12. Hard-Disk Drive Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13

Figure 4-13. Power Supply Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14

Figure 4-14. Microprocessor Fan Removal . . . . . . . . . . . . . . . . . . . . . . . . 4-15

Figure 4-15. System Board Components . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16

vii

Figure 4-16. Expansion-Card Cage Removal . . . . . . . . . . . . . . . . . . . . . . 4-17

Figure 4-17. Expansion-Card Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18

Figure 4-18. Riser Board Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19

Figure 4-19. DIMM Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-20

Figure 4-20. DIMM Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-20

Figure 4-21. Microprocessor Securing Clip. . . . . . . . . . . . . . . . . . . . . . . . 4-21

Figure 4-22. Microprocessor Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-22

Figure 4-23. Terminator Card Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23

Figure 4-24. Add-In Card Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24

Figure 4-25. System Battery Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-25

Figure 4-26. System Board Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26

Figure A-1. System Setup Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-2

Tables

Table 1-1. DC Voltage Ranges. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

Table 1-2. Jumper Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14

Table 1-3. Interrupt Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14

Table 1-4. DREQ Line Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15

Table 1-5. Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16

Table 3-1. POST Beep Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Table 3-2. System Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Table A-1. System Setup Categories. . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-3

viii

ead This First

A prerequisite for using this manual to service Dell computer systems is a basic knowledge of IBM®-compatible PCs and prior training in IBMcompatible PC troubleshooting techniques. In addition to information provided in this manual and th e User’s Guide that c ame with the system, Dell provides the Diagnostics and T r oubleshooting Guide for troubleshooting procedures and instructions on using the Dell diagnostics to test the computer system.

arnings, Cautions, and Notes

Throughout this manual, there may be blocks of text printed in bold type or in italic type. These blocks are warnings, cautions, and notes, and they are used as follows:

WARNING: A WARNING indicates the potential for bodily harm and provides instructions for how to avoid the problem.

CAUTION: A CAUTION indicates either potential damage to hardware or loss of data and provides instructions for how to avoid the problem.

NOTE: A NOTE provides helpful information about using the computer system.

Chapter 1

System Overview

his service manual covers the Dell

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 freque ncy to a m ultiple 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.

OptiPlex® GXpro high-speed, upgrad-

System Overvi ew 1-1

ystem Features

In addition to the standard features found in a traditional personal computer , the Dell OptiPlex GXpro desktop systems include the following new and/or advanced features:

Dual-processor capability.

•

Advanced combination ISA and PCI expansion subsystem.

•

Plug and Play capability.

•

Enhanced dual-interface EIDE subsystem.

•

16-bit integrated audio controller.

•

PCI video card.

•

Integrated 10-Mbps or 10/100-Mbps Ethernet NIC.

•

Integrated Universal Serial Bus (USB) controller with two USB-compliant

•

connectors (included on systems containing the 10/100-Mbps NIC). Desktop chassis.

•

Thermal monitoring.

•

Main system memory consisting of 16 to 512 MB of high-speed EDO

•

DIMMs that provide ECC functionality when used with the Intel 82440FX PCIset.

SMART support-compliant hard-disk drives and SMART support in the

•

system BIOS, which warns you at system start-up if a hard-disk drive has become unreliable.

Quick tests feature in the diskette-based diagnostics (for more information

•

about Run Quick Tests, see “Running the Diskette-Based Diagnostics” in Chapter 2).

All of these features (except the Run Quick Tests feature described in Chapter 2) are briefly described in this chapter . For a complete list of system features, see “Technical Specifications” found later in this chapter.

When following the text in this manual, assume that the location or direction relative to the system unit is as shown in Figure 1-1.

1-2 Dell OptiPlex GX

pro

Systems Service Manual

back of system unit

left side

front of system unit

right side

Figure 1-1. System Unit Orientation

CAUTION: To avoid possible data or file structure corruptions, the front-panel reset button should be used only when the system cannot be rebooted by pressing <Ctrl><Alt><Del>. Before you use the reset button to initiate a hardware reset, close any open application programs and files if possible.

System Overvi ew 1-3

power button

power indicator

reset button

hard-disk drive access indicator

Figure 1-2. Front-Panel Features

power supply

AC power receptacle

voltage selection switch

parallel port connector

serial port 1 connector

mouse connector

keyboard connector

serial port 2 connector

USB connector (2)

diskette/tape drive interface cable

DC power cable

NIC connector

video connector

3.5-inch drive

microphone jack

speaker-out jack

drive cage

hard-disk drive bracket

system board

expansion-card cage

chassis

card-slot openings

line-in jack

1-4 Dell OptiPlex GX

Figure 1-3. Internal View

pro

Systems Service Manual

Dual-Processor Capability

With the installation of a microprocessor add-in card in the terminator card slot, the system unit becomes a dual-processing system. The add-in card’s microprocessor must have the same frequency and cache size as the system board’s microprocessor. In order to take advantage of two processors, dual-processing systems must have multiprocessing operating systems, such as the Microsoft® Windows NT® 3.5x, Win dows NT 4.0, and Novell® NetWare® SMP (symmetric multiprocessing) operating systems. The microprocessor chip s on both the system board and the processor card are replaceable.

Advanced Expansion Subsystem

The computer system offers advanced expansion subsystems that can support a mixture of traditional ISA expansion cards (called legacy cards), Plug and Play ISA expansion cards, and PCI expansion cards. The ISA Configuration Utility (ICU) included with the system provides a means of avoiding resource conflicts that might arise from such an arrangement.

After all legacy cards have been configured with the ICU, the system automatically assigns any required memory space, IRQ lines, and DMA channels to any installed Plug and Play ISA expansion cards and PCI expansion cards the next time the system is rebooted. Chapter 4, “Using the ISA Configuration Utility,” in the User’s Guide describes the ICU and pr ovides in structi ons for using it to co n- figure the system.

The five expansion slots include two ISA expansion-card connectors and five PCI expansion-card connectors. (Two PCI expansion-card connectors and the two ISA expansion-card connectors share a single expansion slot, resulting in a total of five expansion slots.) The expansion-card connectors are located on a riser board (see Figure 1-4).

ISA2

PCI 5

ISA1

JMIDI connector

PCI1

JHDLED connector

Figure 1-4. Riser-Board Expansion-Card Connectors

System Overvi ew 1-5

Hard-Disk Drive Options

The hard-disk drive bracket is located next to the drive bays at the front of the system unit. The system unit can contain up to two, one-inch-high, hard-disk drives or one, 1.6-inch-high, half-height and one, one-inch-high, hard-disk drive.

Enhanced Dual-Interface EIDE Subsystem

The enhanced dual-interface EIDE subsystem supports two EIDE interfaces (primary and secondary), each of which can support up to two EIDE devices. The EIDE controller resides on the high-speed PCI local bus.

The primary EIDE interface (IDE1) provides support for up to two high-

•

performance EIDE devices. The system’s boot drive should be connected to the primary EIDE interface.

The secondary EIDE interface (IDE2) also provides support for up to two

•

high-performance EIDE devices, typically EIDE tape drives or CD-ROM drives.

NOTE: The externally accessible drive bays at the front of the system unit are normally used for diskette drives, CD-ROM drives, and/or tape drives. Harddisk drives should be installed in the internal hard-disk drive bracket described in the previous subsection, “H a rd-Di sk D r i v e O p t i on s . ” F or d e t ai l e d in f o r ma t i o n about the data storage subsystem, see Chapter 9, “Installing Drives,” in the User’s Guide.

Audio Controller

The system board has a built-in 16-bit Creative Labs V iBRA 16 audio controlle r chip and connectors on the back panel for connecting the system unit to external audio devices (speakers, microphone). The controller supports all the sound functions found on the Sound Blaster expansion card from Creative Laboratories, Inc.

Chapter 6, “Using the Integrated Audio Controller,” in the User’s Guide pro- vides instructions for connecting the system to external audio devices and configuring the integrated audio controller to avoid resource conflicts.

PCI Video Card

The video subsystem consists of a high-speed, high-resol ution video adapter card installed in one of the bottom two PCI expansion-card connectors (PCI1 or PCI2). Because the video adapter card connects to the PCI local bus rather than to the ISA-compatible system bus, communication between the video subsystem and the microprocessor is much faster. The PCI local bus operates at a frequency of 30 or 33 MHz as opposed to the 8-MHz operating frequency of the ISA bus.

NOTE: Some users may use an ISA video adapter card.

1-6 Dell OptiPlex GX

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Systems Service Manual

NIC

GXpro systems contain either an integrated 10-Mbps or 10/100-Mbps 3Com NIC. GXpro systems containing the 10-Mbps Ethernet NIC have a built-in inte- grated 3Com 3C915 NIC chip. GXpro systems containing the 10/100-Mbps Ethernet NIC have a built-in integrated 3Com 3C916 Ethernet NIC chip. The NIC subsystem connects to the Ethernet network through a single RJ45 connector on the back panel of the computer.

The 10/100-Mbps NIC supports a 10-Mbps direct connection to either a category-3 or a category-5 ethernet cable. When the NIC operates in the 100-Mbps mode, a category-5 ethernet cable must be used.

GXpro systems with the 10/100-Mbps NIC also contain two USB connectors. Thus, to determine whether a particular system contains the 10/100-Mbps NIC, look for one of the following indications:

USB connectors next to the NIC connector on the computer’s back panel

•

The message USB Enhanced displayed during the boot routine

•

A USB category on page 2 of the System Setup

•

If any of these indications are present, your system has the 10/100-Mbps NIC. Chapter 5, “Using the Network Interface Controller,” in the User’s Guide pro-

vides instructions for connecting the system to, and configuring it for use on, an Ethernet network.

USB

USB capability simplifies connection of peripheral devices such as mice, printers, and computer speakers. The USB connectors on your computer’s back panel provide a single connection point for multiple USB-compliant devices. USB-compliant devices can also be connected and disconnected while the system is running.

NOTE: USB capability is available only on systems with the 10/100-Mbps NIC.

Desktop Chassis

The system unit can be set horizontally or vertically, when used with the floor stand provided with the system. The floor stand attaches to the left side of the system.

Thermal Monitoring

The primary and, if installed, secondary microprocessors have a thermal sensor that monitors the processor’ s temperature. If the critical threshold is exceeded, a system alarm triggers a system management interrupt (SMI), which alerts the BIOS. The power indicator flashes, and a message appears on the monitor to alert the user that the system will shut down in an orderly manner, preventing the loss of data.

System Overvi ew 1-7

SMART Support

The system has SMART-compliant hard-disk drives and SMART support in the system BIOS, which warns you at system start-up if a hard-disk drive has become unreliable.

ystem Unit

The following subsections provide service-related information about the system unit.

System Power Supply

The 230-W system power supply can operate from an AC power source of 115 VAC at 60 Hz or 230 VAC at 50 Hz. The system power supply provides the DC operating voltages and currents listed in Table 1-1.

NOTE: The power supply produces DC voltages only under its loaded condition. Therefore, when you measure these voltages, the DC power connectors must be connected to their corr esponding power input connectors on the s ystem board or drives.

Table 1-1. DC Voltage Ranges

Voltage Range

Maximum Output Current

+3.3 VDC +3.15 to +3.45 VDC 14.0 A +5 VDC +4.75 to +5.25 VDC 29.0 A +12 VDC +11.40 to +12.60 VDC

6.0 A –12 VDC –10.80 to –13.20 VDC 0.3 A –5 VDC –4.50 to –5.50 VDC 0.3 A

+5 VFP

Maximum continuous DC output power shall not exceed 230 W. Maximum combined

VFP (volts flea power) — sometimes called “standby power.”

load on +5 VDC and +3.3 VDC shall not exceed 170 W.

+4.75 to +5.25 VDC 10 mA

Pin Assignments for the DC Power Connectors

The power-supply output voltages can be measured at the back (wire side) of the connectors without disconnecting them. The following illustrations show the wire side of the connectors.

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–5 VDC (white)

common (black)

common (black) common (black)

PSON#

(gray)

12 13 14 15 16 17 18 19 20

+5 VDC (red)

+5 VDC (red) +5 VDC (red)

(brown)

TFSC

+5 VDC (red)

234 5678 910

+5 VDC (red)

common (black)

+5 VDC (red)

common (black)

PWRGOOD

Pin 11 — PSON# should measure between +4 and +5 VDC except when the power button

(orange)

common (black) common (black)

–12 VDC (blue) +12 VDC (yellow) +5 VFP (purple)

on the front panel is pressed, taking PSON# to its active-low state.

Pin 19 — Thermal fan-speed control (TFSC) is a power-supply input signal used to control

power-supply fan speed in specia l applications.

Pin 5 — PWRGOOD should measure between +4 and +5 VDC when the po wer supply is on

and operating to indicate that all power-supply output voltages are within ranges specified in Table 1-1.

Figure 1-5. DC Power Connector P1

P2, P3, P5, P6

1234

+5 VDC (red) common (black) common (black) +12 VDC (yellow)

1234

+12 VDC (yellow) common (black) common (black) +5 VDC (red)

Figure 1-6. DC Power Connectors P2, P3, P4, P5, and P6

System Overvi ew 1-9

1234

+3.3 VDC (blue/white)

+3.3 VDC (blue/white) +3.3 VDC (blue/white)

common (black) common (black) common (black)

Figure 1-7. DC Power Connector P7

DC Power Distribution

Figures 1-8 and 1-9 provide the following information about DC power distribution:

Power-supply connector identification

•

Power cable connections for diskette, tape, CD-ROM, and hard-disk drives

•

Power distribution to sockets and connectors on the system board

•

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Figure 1-8. DC Power Cables

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system

power supply

PWRGOOD

PSON# +5 VFP +5 VDC –5 VDC +12 VDC –12 VDC

P7 +3.3 VDC

keyboard controller

POWER1

PSON# +5 VFP +5 VDC –5 VDC +12 VDC –12 VDC

POWER2

power

management

logic

+3 VDC

RTC/

NVRAM

system board

battery

RISER

+5 VDC –5 VDC +12 VDC –12 VDC

+12 VDC

FAN

riser board

+5 VDC +12 VDC –12 VDC

+5 VDC –5 VDC +12 VDC –12 VDC

PCI1 through PCI5

ISA1, ISA2

main memory

optional

drive

optional

drive

3.5-inch

diskette drive

internal

sockets

DIMM_A

DIMM_B

DIMM_C

DIMM_D

MICROPROCESSOR

hard-disk drive

internal

hard-disk drive

2ND_CPU

Figure 1-9. Power Distribution

+2.1–3.5 VDC

+3.3 VDC

+2.1–3.5 VDC

+3.3 VDC

+5 VFP

+5 VDC

FUSE

+5 VDC

FUSE

+5 VDC

processor core regulator

PANEL

USB

KYBD

MOUSE

System Overvi ew 1-11

System Board Layout

The subsections that follow provide service-related information about the system board components.

microphone jack (NIC-IN)

speaker-out jack (SPKR-OUT)

line-in jack (LINE-IN)

riser board power connector (RSR PWR1)

riser board connector (RISER)

riser board power connector (RSR PWR2)

secondary microprocessor card (or terminator card) connector (2ND_CPU)

NIC connector (ENET)

front of system unit

primary EIDE interface connector (IDE1)

USB connector (USB)

serial port 2 connector (SERIAL2)

jumpers

keyboard/mouse connectors (stacked) (KYBD/MOUSE)

control panel connector (PANEL)

serial port 1/parallel port connectors (stacked) (PARALLEL/SERIAL)

microprocessor fan connector (FAN)

battery socket (BATTERY)

DIMM sockets (4) main power input

connector (POWER1)

microprocessor socket (MICROPROCESSO R)

3.3-V power input connectors (POWER2)

CD-ROM connector (CD_IN)

diskette/tape drive interface connector (DSKT)

secondary EIDE interface connector (IDE2)

Figure 1-10. System Board Components

Video Memory

See the documentation from the video card manufacturer that came with your system for information on removing and replacing video-memory upgrade chips.

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Main Memory

The four DIMM sockets on the system board can accommodate combinations of 16-, 32-, 64-, and 128-MB DIMMs up to a total memory capacity of 512 MB. The system is shipped with high-speed (60-ns) EDO DIMMs that provide ECC functionality when used with the Intel 82440FX PCIset. EDO parity mode DIMMs can be mixed, as follows:

Any socket can be populated or not. There is no requirement that one socket

•

be filled before the other, and empty sockets can be left between installed DIMMs. Dell recommends populating the sockets in order from A to D.

Each DIMM socket does not have to contain DIMMs of the same size or

•

speed. DIMMs may be installed in any order.

See “DIMMs” in Chapter 4 for information on removing and replacing DIMMs.

System Board Jumpers

jumpered

unjumpered

Figure 1-11. System Board Jumpers

System Overvi ew 1-13

Table 1-2. Jumper Descriptions

Jumper Description

Default Setting

PSWD Password enable/disable.

Jumper installed, activates password feature.

BIOS Used for internal Dell

debug tool.

RSRVD4 RSRVD3 RSRVD2 RSRVD1

200MHZ Microprocessor speed. Installed if the micro-

180MHZ Microprocessor speed. Installed if the micro-

Reserved. Not installed (reserved, do not

Installed (password feature enabled)

Not installed (reserved, do not

change)

processor’s internal speed is 200 MHz, or else not installed

processor’s internal speed is 180 MHz, or else not installed

nterrupt Assignments

Table 1-3. Interrupt Assignments

IRQ Line Used By/Available

IRQ0 Generated by system timer. IRQ1 Generated by keyboard controller to indicate that keyboard’s out-

put buffer is full.

IRQ2 Generated internally by interrupt controller to enable IRQ8

through IRQ15.

IRQ3 and IRQ4

IRQ5 Available for use by expansion card unless this IRQ line is used

IRQ6 Generated by super I/O controller to indicate that diskette or tape

IRQ7 Generated by super I/O controller to indicate that device con-

Generated by super I/O controller to indicate that device connected to corresponding serial port requires service (IRQ3 for COM2 or COM4; IRQ4 for COM1 or COM3).

by secondary parallel port.

drive requires service.

nected to parallel port requires service.

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Table 1-3. Interrupt Assignments

IRQ Line Used By/Available

IRQ8 Generated by keyboard controller for each tick of RTC. IRQ9 Available for use by expansion card. IRQ10 Available for use by expansion card. IRQ11 Available for use by expansion card. IRQ12 Generated by keyboard controller to indicate t hat mouse’s output

buffer is full. IRQ13 Generated by math coprocessor to indicate coprocessor error. IRQ14 Generated by device connected to primary EIDE port to indicate

that device requires service. If no EIDE devices are installed, this

line is available for other use. IRQ15 Generated by device connected to secondary EIDE port to indi-

cate that device requires service. If no device is connected to

secondary EIDE port, IRQ15 is available for use by expansion

card.

(continued)

MA Channel Assignments

Table 1-4. DREQ Line Assignments

DREQ Line Used By/Available

DREQ0 Available DREQ1 Available DREQ2 Generated by super I/O controller to initiate DMA cycle for

attached diskette drive DREQ3 Available DREQ4 Generated by bus controller chip to activate second DMA con-

troller DREQ5 Available (default) DMA on-board sound controller DREQ6 Available DREQ7 Available

System Overvi ew 1-15

echnical Specifications

Table 1-5. Technical Specifications

Microprocessor

Microprocessor type. . . . . . . . Intel Pentium Pro microprocessor

Microprocessor speed. . . . . . . 200 or 180 MHz

First-level cache . . . . . . . . . . . 16 KB

Second-level cache. . . . . . . . . 256 KB for 180 or 200 MHz; 512 KB for

200 MHz

Math coprocessor . . . . . . . . . . internal to the microprocessor

System Information

System chip set. . . . . . . . . . . . Intel Natoma 82440FX set

Data bus width . . . . . . . . . . . . 64 bits

Address bus width . . . . . . . . . 32 bits

Flash EPROM. . . . . . . . . . . . . 2 Mbits

Expansion Bus

Bus types . . . . . . . . . . . . . . . . PCI and ISA

Bus speed . . . . . . . . . . . . . . . . PCI: 30 MHz (180/60 processor); 33 MHz

(200/66 processor) ISA: 7.5 MHz (180/60 processor); 8.25 MHz (200/66 processor)

PCI expansion-card

connectors. . . . . . . . . . . . . . . . five (two PCI connectors share card-slot open-

ings with the two ISA connectors)

ISA expansion-card

connectors. . . . . . . . . . . . . . . . two (both ISA connectors share card-slot

openings with two of the PCI connectors)

ISA expansion-card

connector size. . . . . . . . . . . . . 98 pins

ISA expansion-card connector

data width (maximum) . . . . . . 16 bits

PCI expansion-card

connector size. . . . . . . . . . . . . 120 pins

PCI expansion-card connector

data width (maximum) . . . . . . 32 bits

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Table 1-5. Technical Specifications

System Clocks

(continued)

System clock. . . . . . . . . . . . . . 60 or 66 MHz (matches external processor

speed)

Diskette/communications

ports . . . . . . . . . . . . . . . . . . . . 24 MHz from the system clock

Memory

Architecture . . . . . . . . . . . . . . 64-bit, noninterleaved

DIMM sockets . . . . . . . . . . . . four

DIMM capacities . . . . . . . . . . 16, 32, 64, and 128 MB, EDO ECC mode

Standard RAM . . . . . . . . . . . . 16 MB

Maximum RAM . . . . . . . . . . . 512 MB

BIOS address . . . . . . . . . . . . . F000:0000h–F0000:FFFFh

Drives

Externally accessible bays . . . one 3.5-inch bay, dedicated to a 3.5-inch dis-

kette drive; two 5.25-inch bays for half-height diskette drives, tape drives, or CD-ROM drives

Internally accessible bays . . . . two hard-disk drive bays; one 1.6-inch-high

and one 1-inch-high EIDE or SCSI hard-disk drive

Ports

Externally accessible:

Serial (DTE) . . . . . . . . . . . two 9-pin connectors; 16550-compatible

Parallel . . . . . . . . . . . . . . . one 25-hole connector (bidirectional)

Video. . . . . . . . . . . . . . . . . one 15-hole connector (on add-in video card)

PS/2-style keyboard . . . . . 6-pin mini-DIN

PS/2-compatible

mouse . . . . . . . . . . . . . . . . 6-pin mini-DIN

NIC . . . . . . . . . . . . . . . . . . RJ45 connector

USB. . . . . . . . . . . . . . . . . two USB-compliant connectors

Audio line in . . . . . . . . . . . miniature audio jack

Audio speaker out. . . . . . . miniature audio jack

Audio mike in . . . . . . . . . . miniature audio jack

System Overvi ew 1-17

Table 1-5. Technical Specifications

(continued)

Ports

(continued)

Internally accessible:

EIDE hard-disk drive . . . . two 40-pin connectors on PCI local bus

Diskette drive . . . . . . . . . . 34-pin connector

Video

Video type. . . . . . . . . . . . . . . . PCI video card (see manufacturer’s specifica-

tions)

Key Combinations

<Ct r l >< A l t > < D e l>. . . . . . . . . . . . restarts (reboots) the system

<Ctrl><Alt>< Enter> . . . . . . . . . . . starts System Setup program (during POST

only)

<Ctrl><Alt><\> . . . . . . . . . . . toggles microprocessor speeds on 101-key

keyboard (in MS-DOS® real mode only)

<Ctrl><Alt><#>. . . . . . . . . . . toggles microprocessor speeds on 102-key

keyboard

Controls and Indicators

Reset control. . . . . . . . . . . . . . push button

Power control . . . . . . . . . . . . . push button

Power indicator. . . . . . . . . . . . green LED

Hard-disk drive access

indicator . . . . . . . . . . . . . . . . . green LED

Link integrity indicator

(on NIC connector). . . . . . . . . green LED

Activity indicator

(on NIC connector). . . . . . . . . yellow LED

Power

DC power supply:

Wattage. . . . . . . . . . . . . . . 230 W

Heat dissipation . . . . . . . . 600 BTUs (nominal)

Voltage . . . . . . . . . . . . . . . 90 to 135 V at 60 Hz;

180 to 265 V at 50 Hz

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Backup battery . . . . . . . . . . . . 3-V CR2032 coin cell

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Table 1-5. Technical Specifications

Physical

(continued)

Height . . . . . . . . . . . . . . . . . . . 16.5 cm (6.5 inches)

Width. . . . . . . . . . . . . . . . . . . . 41.9 cm (16.5 inches)

Depth. . . . . . . . . . . . . . . . . . . . 44.5 cm (17.5 inches)

Environmental

Weight . . . . . . . . . . . . . . . . . . 12.7 kg (28 lb) or more, depending on options

installed

Temperature:

Operating . . . . . . . . . . . . . 10° to 35°C (50° to 95°F)

Storage . . . . . . . . . . . . . . . –40° to 65°C (–40° to 149°F)

Relative humidity . . . . . . . 8% to 80% (noncondensing)

Maximum vibration:

Operating . . . . . . . . . . . . . 0.25 G at 3 to 200 Hz for 30 min

Storage . . . . . . . . . . . . . . . 0.5 G at 3 to 200 Hz for 30 min

Maximum shock:

Operating . . . . . . . . . . . . . half-sine wave form: 50 G for 2 ms

Storage . . . . . . . . . . . . . . . half-sine wave form: 110 G for 2 ms;

square wave form: 27 g for 15 ms

Altitude:

Operating . . . . . . . . . . . . . –16 to 3048 m (–50 to 10,000 ft)

Storage . . . . . . . . . . . . . . . –16 to 10,600 m (–50 to 35,000 ft)

System Overvi ew 1-19

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Chapter 2

Basic Troubleshooting

his chapter describes basic troubleshooting procedures that can help you

diagnose a computer system problem. These procedures can often reveal the source of a problem or indicate the correct starting point for troubleshooting the system. A brief explanation of how to load and start the diskette-based diagnostics is located at the end of the chapter. Dell recommends that you perform the following procedures in the order they are presented in this manual.

nitial User Contact

When you first contact a user who has a problem, ask the user to describe the problem and the conditions under which it occurs. A verbal description can often indicate the cause of a problem or indicate the appropriate troubleshooting procedure to use. After the user describes the problem, follow these steps:

1. Ask the user to back up any data on the hard-disk drive if the system’s condition permits.

Appendix D, “Maintaining the System,” in the User’s Guide provides infor- mation about backing up data.

2. Ask the user to try to duplicate the problem by repeating the operations he or she was performing at the time the problem occurred.

Can the user duplicate the problem?

Yes. Proceed to step 3. No. Proceed to the next section, “External Visual Inspection.”

3. Observe the user to determine if he or she is making an error, such as typing an incorrect key combination or entering a command incorrectly.

Is the problem a result of user error? Yes. Instruct the user in the proper procedure, or direct him or her to the

appropriate user documentation for the correct procedure. No. Proceed to the next section, “External Visual Inspection.”

Basic Troubleshooting 2-1

xternal Visual Inspection

The external visual inspection consists of a quick inspection of the exterior of the system unit, the monitor, the keyboard, any peripherals, and cables. While performing the visual inspection, make any necessary corrections. To perform the external visual inspection, follow these steps:

1. Turn off the system unit, the monitor, and all peripherals.

2. Verify that all power cables are properly connected to the system unit, the monitor and peripherals, and their power sources.

3. Verify that the keyboard and mouse interface cables are firmly attached to the proper connectors on the back of the system unit.

For a PS/2-compatible mouse, the keyboard and mouse interface cable connectors are identical except for their labels. If needed, see “System Features” in Chapter 1.

For a serial mouse, the mouse interface cable must be firmly attached to one of the serial port connectors, and its captive screws must be secure enough to ensure a firm connection.

4. Verify that any devices connected to the serial ports, parallel port, and USB are properly attached.

Each of the serial, parallel, and USB interface cables must be firmly attached to an appropriate connector on the back of the system unit as well as to the interface connector on the device. The captive screws that secure these connectors at each end of the interface cable must be secure enough to ensure a firm connection.

5. Verify that the video interface cable is firmly attached to the connector on the video expansion card and to the connector on the back of the monitor.

For proper connection of the video monitor, see the documentation for the monitor.

6. Inspect all external monitor controls for any obvious damage or improper settings.

For proper settings of the video monitor controls, see the documentation for the monitor.

7. Inspect the keyboard to ensure that no keys are sticking.

If one or more keys are sticking, it may be necessary to replace the keyboard.

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8. Inspect the exterior of the system unit, including all controls and indicators, and all user-accessible data storage devices for any signs of physical damage.

Does the inspection reveal any problems? Yes. Proceed to the appropriate procedure in Chapter 4, “Removing and

Replacing Parts.” No. Proceed to the next section, “Observing the Boot Routine.”

bserving the Boot Routine

After you have performed an external visual inspection as described in the previous section, you should boot the system and, while the boot routine is running, observe the system for any indications of problems.

NOTE: Most of the steps in this procedure require observation of system functions and indications, some of which can occur simultaneously. It may be necessary to reboot the system several times in order to complete all of these steps.

To observe problem indications during the boot routine, follow these steps:

1. Insert the diagnostics diskette into drive A. Turn on all peripherals and the system unit. If the system unit is already on, press the reset button or <Ctrl><Alt><Del> to reboot the system.

2. Check the power supply fan.

Does the fan run normally?

Yes. Proceed to step 3. No. Troubleshoot the system power supply.

3. Watch the Num Lock, Caps Lock, and Scroll Lock indicators on the upper-right corner of the keyboard. After all three indicators flash momentarily, the Num Lock indicator should light up and remain on.

Do these indicators flash on and off within approximately ten seconds after the boot routine starts?

Yes. Proceed to step 4. No. Troubleshoot the system power supply. If the troubleshooting pro-

cedure indicates that the system power supply is operational, troubleshoot the memory.

4. During the boot routine, observe the system unit for any of the following:

Diskette-drive and hard-disk drive access indicators: These indicators

•

light up in response to data being transferred to or from the drives. If either of these indicators fails to light up during the boot routine, troubleshoot the diskette drive or hard-disk drive subsystem, as appropriate.

Basic Troubleshooting 2-3

System error messages: These messages can indicate problems or pro-

•

vide status information. If a system error message is displayed, see Table 3-2.

Beep codes: A beep code is a series of beeps that indicates an error con-

•

dition. If the system emits a beep code, see Table 3-1.

NOTE: The system beeps on ce during t he boot r o utine. T his sing le beep i s

normal and is not a beep code.

5. Observe the monitor screen for the Diagnostics Menu.

Does the Diagnostics Menu appear?

Yes.

See “Running the Diskette-Based Diagnostics” found later in this

chapter.

No.

Proceed to step 6.

6. Insert another copy of the diagnostics diskette into the diskette drive, and reboot the system.

Does the Diagnostics Menu appear?

Yes.

See “Running the Diskette-Based Diagnostics” found later in this

chapter.

No.

Proceed to the next section, “Internal Visual Inspection.”

nternal Visual Inspection

CAUTION: Before you proceed with the internal visual inspection described in this section, ensure that the user has s aved all open files and exited all open application programs if possible.

A simple visual inspection of a system unit’s interior hardware can often lead to the source of a problem, such as a loose expansion card, cable connector, or mounting screw. When you perform the visual inspection, refer to “System Features” in Chapter 1 to locate components in the inspection procedure.

To perform the internal visual inspection, follow these steps:

1. Turn off the system, including any attached p eripherals, and disconnect all the AC power cables from their power sources.

2. Remove the system unit cover.

3. Verify that all chips, DIMMs, and expansion cards, are fully seated in their sockets or connectors.

WARNING: The microprocessor can get extremely hot. Be sure the chip has had sufficient time to cool before you touch it.

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To ensure that the chips are fully seated in their sockets, press firmly on the top of each chip.

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Systems Service Manual

To reseat the microprocessor, remove it from its socket and reinstall it as described in “Microprocessor/Heat Sink Assembly” in Chapter 4.

To reseat a DIMM, remove it from its socket and reinstall it as described in “DIMMs” in Chapter 4.

If you need to reseat an expansion card, use a the screw that secures the card-mounting bracket. Grasp the card by its top corners, and carefully pull it out of its connector. Reinsert the card in its connector, and carefully push it in until it is fully seated. Then reinstall the card-mounting bracket’s retaining screw.

4. Verify that all jumpers are set correctly.

For information about these jumpers, see “System Board Jumpers” in Chapter 1.

5. Check all cable connectors insid e the syst em unit to v erify that they ar e firmly attached to their appropriate connectors.

6. Reinstall the system unit cover.

7. Reconnect the system unit and any attached peripherals to their power sources, and turn them on.

Does the problem appear to be resolved?

Yes. No further steps are necessary. Terminate the procedure. No. Proceed to “Eliminating Resource Conflicts,” “Running the Diskette-

Based Diagnostics,” and to “Getting Help” found later in this chapter.

-inch nut driver to remove

1/4

liminating Resource Conflicts

Devices within the system unit may require dedicated memory spaces, interrupt levels, or DMA channels, all of which must be allocated during installation of the devices. Because a device may be installed at a different time, it is possible that the same resource is assigned to two or more devices.

Resource conflicts can result in disorderly or erratic system operation or failure of the system to operate at all. If you suspect that resource conflicts might exist, check the system and reassign the resources as necessary.

unning the Diskette-Based Diagnostics

The diskette-based diagnostics (included with the system) contains tests that aid in troubleshooting all major components of the computer system.

CAUTION: To prevent damage to the original diagnostics diskette, always use a backup copy of the diagnostics diskette when servicing a user’s system. Dell recommends that users make several copies of this diskette to ensure that one is always available.

Basic Troubleshooting 2-5

To start the diagnostics, turn off the system unit, insert a diagnostics diskette into drive A, and then turn on the system unit.

Starting the diagnostics causes the Dell logo screen to appear on the monitor screen, followed by a message indicating that the diagnostics is loading. Before the diagnostics loads, a program tests the portion of main memory (RAM) required for loading the diagnostics. If a RAM error is detected, a message appears on the screen telling you which DIMM has failed.

If no errors are found in RAM, the diagnostics loads and the Diagnostics Menu appears. This menu lets you choose the following options or exit to the MS-DOS prompt:

Run Quick Tests — Runs selected tests from all test groups to quickly

•

locate a failure or to indicate where further testing is needed to isolate a failure

Run All Tests — Runs all tests for a thorough test of the system

•

Run Specific Tests — Tests a particular area or subsystem

•

etting Help

If none of the troubleshooting procedures in this chapter or the tests in the diskette-based diagnostics reveals the source of the problem or leads to the proper troubleshooting steps for determining the source of the problem, call Dell for technical assistance. For instructions, see the chapter titled “Getting Help” in the Diagnostics and T roubleshooting Guide.

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Chapter 3

Beep Codes and Error Messages

his chapter describes beep codes and system error messages that can occur

during system start-up or, in the case of some failures, during normal system operation. The tables in this chapter list faults that can cause a beep code or system error message to occur and the probable causes of the fault in each case.

If a faulty system does not emit beep codes or display system error mess ages to indicate a failure, you should use the diskette-based diagnostics to run the appropriate tests to help isolate the source of the problem. See “Running the Diskette-Based Diagnostics” in Chapter 2.

OST Beep Codes

If the monitor cannot display error messages during the POST, the system may emit a series of beeps that identifies the problem or that can help you identify a faulty component or assembly . Table 3-1 lists the beep codes that may be generated during the POST. Most beep codes indicate a fatal error that prevents the system from completing the boot routine until the indicated condition is corrected.

When the system emits a beep code, record the code and then find it in Table 3-1. If the table does not lead to the source of the problem, run the appropriate tests in the diskette-based diagnostics to assist in troubleshooting the problem.

Table 3-1. POST Beep Codes

Beep Code Error Probable Causes

1-3 Monitor not detected Disconnected or faulty moni-

tor 1-1-3 NVRAM write/read failure Defective system board 1-1-4 BIOS checksum failure Faulty BIOS or defective sys-

tem board 1-2-1

1-2-2 1-2-3

Programmable interval-timer failure

DMA initialization failure DMA page register write/

read failure

Defective system board

Beep Codes and Error Messages 3-1

Table 3-1. POST Beep Codes

Beep Code Error Probable Causes

(continued)

1-3-1 Main-memory refresh verifi-

cation failure

1-3-3

Chip or data line failure in the first 64 KB of main memory

1-3-4

Odd/even logic failure in the first 64 KB of main memory

1-4-1

Address line failure in the first 64 KB of main memory

1-4-2

Parity failure in the first 64 KB of main memory

2-1-1 through

Bit failure in the first 64 KB of main memory

2-4-4 3-1-1

3-1-2

Slave DMA-register failure Master DMA-register failure

Faulty or improperly seated DIMMs or defective system board

Faulty or improperly seated DIMMs

Defective system board

3-1-3

Master interrupt-mask register failure

3-1-4

Slave interrupt-mask register failure

3-2-4 Keyboard-controller test fail-

ure

3-3-4 3-4-1 3-4-2

4-2-1 4-2-2 4-2-3 4-2-4

Screen initialization failure Screen-retrace test failure Search for video ROM failure

No timer tick Shutdown failure Gate A20 failure Unexpected interrupt in pro-

tected mode

Faulty keyboard controller (defective system board)

Faulty video subsystem (defective video expansion card)

Defective system board

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4-3-1 Memory failure above

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address 0FFFFh

Faulty or improperly seated DIMMs

Table 3-1. POST Beep Codes

Beep Code Error Probable Causes

4-3-3 Timer-chip counter 2 failure Defective system board 4-3-4 Time-of-day clock stopped Bad battery or defective sys-

4-4-1 Serial/parallel port test failure Faulty I/O chip (defective sys-

ystem Error Messages

Table 3-2 lists (in alphabetical order) system error messages that can appear on the monitor screen. These messages can help you find the source of a problem. Some of these error messages indicate fatal errors. When a fatal error occurs, the system usually cannot be rebooted until an appropriate hardware change has been made. The following messages indicate a fatal error:

Bad error-correction code (ECC) on disk read

•

Controller has failed

•

(continued)

tem board

tem board)

Data error

•

Gate A20 failure

•

Hard disk controller failure

•

Hard disk drive read failure

•

Hard disk failure

•

Incompatible Processor: CPU0 is B0 step or below

•

Incompatible Processor: CPU1 is B0 step or below

•

Incompatible Processors: Cache sizes different

•

Keyboard clock line failure

•

Keyboard controller failure

•

Keyboard data line failure

•

Keyboard stuck key failure

•

No timer tick interrupt

•

Shutdown failure

•

Terminator/processor card not installed! System

•

HALTED! Timer chip counter 2 failed

•

Unexpected interrupt in protected mode

•

Beep Codes and Error Messages 3-3

Table 3-2. System Error Me ssa ges

Message Definition Probable Causes

Address mark not found

BIOS found faulty disk sector or could not find particular disk sector.

Attachment failed to respond

Diskette drive or harddisk drive controller cannot send data to associated drive.

Bad command or file name

Command entered does not exist or is not in pathname specified.

Bad errorcorrection code(ECC) on disk read

Controller has failed

Diskette drive or harddisk drive controller detected uncorrectable read error.

Hard-disk drive or associated controller defective.

Data error System received un-

recoverable data-read error from diskette or hard-disk drive.

Faulty diskette/tape drive subsystem or hard-disk drive subsystem (defective system board). Faulty interface cable or connector.

Bad command.

Faulty diskette/tape drive subsystem or hard-disk drive subsystem (defective system board).

Faulty diskette, diskette drive, or hard-disk drive.

Decreasing available memory

Diskette drive 0 seek failure

Diskette drive 1 seek failure

Diskette read failure

Read/write failure during POST prevents system from using available memory.

Diskette/tape drive controller could not locate specific sector or track.

Failure occurred while system attempted to read diskette.

One or more DIMMs faulty or improperly seated.

Faulty or improperly inserted diskette, incorrect settings in System Setup program, loose diskette/tape drive interface cable, or loose power cable.

Faulty diskette, faulty or improperly connected diskette/tape drive interface cable, or loose power cable.

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Table 3-2. System Error Messages

Message Definition Probable Causes

(continued)

Diskette subsystem reset failed

Diskette write protected

Drive not ready

Gate A20 failure

General failure

Hard disk controller failure

Hard disk drive read failure

Hard disk failure

System could not successfully issue reset command to diskette controller.

Diskette write-protect feature activated.

Diskette missing from or improperly inserted in diskette drive.

Gate A20 of the keyboard controller malfunctioned.

Operating system cannot execute command.

Hard-disk drive failed to initialize.

Faulty diskette/tape drive controller (defective system board).

Diskette write-protected.

Missing, defective, unformatted, or improperly inserted diskette.

Faulty keyboard controller (defective system board).

Operating system corrupted or not installed properly.

Incorrect configuration settings in System Setup program, improperly connected hard-disk drive cable, faulty hard-disk controller subsystem (defective system board), or loose power cable.

Incompatible Processor: CPU0 is B0 step or below

Incompatible Processor: CPU1 is B0 step or below

Incompatible Processors: Cache sizes different

Unsupported version of microprocessor installed on system board.

In a dual-processor system both microprocessors do not have the same level-2 cache.

Unsupported microprocessor installed.

Microprocessors do not have the same level-2 cache.

Beep Codes and Error Messages 3-5

Table 3-2. System Error Messages

Message Definition Probable Causes

(continued)

Invalid configuration information please run SETUP program

Keyboard clock line failure

Keyboard failure

Keyboard data line failure

Keyboard stuck key failure

Keyboard controller failure

System Setup program contains incorrect system configuration settings.

System cannot communicate with keyboard.

Keyboard/mouse controller failed.

Incorrect configuration settings in System Setup program or faulty battery.

Keyboard cable connector loose or improperly connected, defective keyboard, or defective keyboard/mouse controller (defective system board).

Defective keyboard/ mouse controller (defective system board).

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Table 3-2. System Error Messages

Message Definition Probable Causes

(continued)

Memory address line failure at

address value

ing

Memory data line failure at read expecting

Memory double word logic failure at

address value

ing

Memory odd/ even logic failure at

address value

ing

, read

expect-

value

address

value

, read

expect-

value

, read

expect-

value

During memory test, value read at was incorrect.

address

Faulty or improperly seated DIMMs or defective system board.

Memory write/ read failure at

address

read expecting

Memory allocation error

Memory tests terminated by keystroke

"Network card is not present in the system"

value

Software in use conflicts with operating system, application program, or utility.

Memory test did not complete.

System does not detect NIC.

Faulty application program or utility.

POST memory test terminated by pressing <Spacebar>.

Incorrect NIC drivers installed.

Beep Codes and Error Messages 3-7

Table 3-2. System Error Messages

Message Definition Probable Causes

(continued)

No boot device available

No boot sector on hard-disk drive

No timer tick interrupt

Non-system disk or disk error

Not a boot diskette

Plug and Play Configuration Error

System does not recognize diskette drive or hard-disk drive from which it is trying to boot.

Configuration settings in System Setup program incorrect, or operating system corrupted.

Timer on system board malfunctioning.

Diskette in drive A or hard-disk drive does not have bootable operating system installed on it.

No operating system on diskette.

System encountered problem in trying to configure one or more expansion cards.

Faulty diskette, diskette/ tape drive subsystem, hard-disk drive, hard-disk drive subsystem, or no boot disk in drive A.

Incorrect configuration settings in System Setup program, or no operating system on hard-disk drive.

Defective system board.

Faulty diskette, diskette/ tape drive subsystem, or hard-disk drive subsystem.

No operating system on diskette.

System resource conflict.

Read fault

MS-DOS cannot read from diskette or harddisk drive.

Requested sector not found

System could not find particular sector on disk, or requested sector defective.

Reset failed Disk reset operation

failed.

Faulty diskette, diskette/ tape drive subsystem, or hard-disk drive subsystem (defective system board).

Improperly connected diskette/tape drive, harddisk drive interface cable, or power cable.

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Table 3-2. System Error Messages

Message Definition Probable Causes

(continued)

Sector not found

MS-DOS unable to locate sector on diskette or hard-disk drive.

Seek error MS-DOS unable to

locate specific track on diskette or hard-disk drive.

Seek operation failed

System could not find particular address mark on disk.

Shutdown failure

Terminator/ processor card not

System board chip faulty.

System does not have terminator or add-in card.

installed! System HALTED!

Time-of-day

Backup battery low. Defective battery or

clock stopped

Defective sectors on diskette or hard-disk drive.

Defective diskette or hard-disk drive.

Faulty diskette or harddisk drive.

Defective system board.

Terminator or add-in card improperly installed, or no card installed.

faulty chip (defective system board).

Time-of-day not set

Timer chip counter 2 failed

Unexpected interrupt in protected mode

WarningThermal probes failed

Time or Date s ettings i n System Setup program incorrect, or backup battery bad.

Timer circuit on system board malfunctioning.

Keyboard/mouse controller malfunctioning, or one or more DIMMs improperly seated.

At system start-up, BIOS detected that one or both thermal probes are nonoperational.

Incorrect Time or Date settings, or defective backup battery.

Defective system board.

Improperly seated DIMMs or faulty keyboard/mouse controller chip (defective system board).

Defective system board.

Beep Codes and Error Messages 3-9

Table 3-2. System Error Messages

Message Definition Probable Causes

(continued)

WarningTemperature is too high

Write fault

Write fault on selected drive

At system start-up, BIOS detected that one or both microprocessors have overheated.

MS-DOS cannot write to diskette or hard-disk drive.

One or both microprocessors are too hot.

Faulty diskette or harddisk drive.

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Chapter 4

Removing and Replacing Parts

his chapter provides procedures for removing the components, assemblies,

and subassemblies in the system unit. Unless otherwise noted, each procedure assumes the following:

You have performed the steps in “Precautionary Measures” found later in

•

this chapter. You have removed the system unit cover.

•

You can replace or reinstall a part by performing the removal procedure in

•

reverse order unless additional information is provided.

ecommended Tools

Most of the procedures in this chapter require the use of one or more of the following tools:

Small flat-blade screwdriver

•

Wide flat-blade screwdriver

•

Number 1 and number 2 Phillips-head screwdrivers

•

Chip-removal tool

•

Also, use a wrist grounding strap as explained in the next section, “Precautionary Measures.”

-inch nutdriver

1/4

Tweezers or long-nose pliers

Removing and Replacing Parts 4-1

recautionary Measures

Before you perform any of the procedures in this chapter, take a few moments to read the following warning for your personal safety and to prevent damage to the computer system from ESD.

WARNING FOR YOUR PERSONAL SAFETY

AND PROTECTION OF THE EQUIPMENT:

Before you start to work on the computer, perform the following steps in the sequence indicated.

1. Turn off the system unit and any attached peripherals.

2. Discon nect the system unit and an y attached peripherals from their power sources to reduce the potential for personal injury or shock.

3. Wear a wrist grounding strap, and clip it to an unpainted metal surface, such as the system power supply’s fan guard, on the chassis.

If a wrist grounding strap is not available, touch the fan guard or some other unpainted metal surface on the back of the system unit to discharge any static charge from your body.

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loor Stand

floor stand screw

Figure 4-1. Floor Stand Removal

To remove the floor stand, follow these steps:

1. Place left side of the system unit on a flat work surface.

2. Unscrew the floor stand screw.

Use your fingers or a wide flat-blade screwdriver to unscrew the floor stand screw. The screw is captured and separated from the floor stand.

3. Pull the floor stand away from the system unit.

Disengage the three orientation nubs that position and help hold the floor stand to the system unit.

Removing and Replacing Parts 4-3

ystem Unit Cover

securing button

front of system unit

Figure 4-2. System-Unit Cover Removal

To remove the system unit cover, follow these steps:

1. Remove the padlock if one is installed.

back of system unit

4-4 Dell OptiPlex GX

Figure 4-3. Padlock Removal

2. Press in the two securing buttons until the cover is free to swing up.

3. Lift the cover, from the back, pivoting it toward the front of the system unit.

Four plastic hooks on the inside of the front part of the cover secure it to the chassis.

Before you reinstall the cover, fold all cables out of the way so that they do not interfere with the cover or with the proper airflow ins ide the system unit.

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ject, Power, and Reset Buttons

system unit cover (upside down)

reset button

eject button

power button

3.5-inch frontpanel insert

Figure 4-4. Eject, Power, and Reset Button Removal

To remove the eject, power, and reset buttons, follow these steps:

1. Lay the system unit cover upside down on a flat work surface, with the back of the cover facing you.

2. To remove the 3.5-inch diskette-drive eject button, pull gently on the plastic part of the button until it comes free.

3. To remove the power button or the reset button, use a small screwdriver and push in on the two or three plastic clips that hold the button to the system unit cover. When these clips are released, the button comes free from the front panel of the cover.

Removing and Replacing Parts 4-5

ront-Panel Inserts

system unit cover (upside down)

post (2)

ring-tab (2)

5.25-inch frontpanel insert

Figure 4-5. Front-Panel Insert Removal

To remove a front-panel insert, follow these steps:

1. Lay the system unit cover upside down on a flat work surface, with the back of the cover facing you.

2. For a 5.25-inch bay, pull the insert from the two retaining posts until the ring-tabs are released (see Figure 4-5).

For the 3.5-inch bay, locate the spring-loaded back end of the eject button mechanism. Press the mechanism toward the front panel to snap the plastic insert out of its opening (see Figure 4-4

To replace a front-panel insert for a 5.25-inch bay, position the insert over the drive bay opening. Place the panel over the retaining posts, and then press hard to get the ring-tabs over the posts. If necessary, use a

-inch nutdriver to help

1/4

push the ring-tabs. To replace the front-panel insert for the 3.5-inch bay, from outside the cover,

place the insert in position and press it into the opening.

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ndicator Card

chassis hook (2)

indicator card

screw

indicator card cable

speaker connector

Figure 4-6. Indicator Card Removal

To remove the indicator card, follow these steps:

1. Remove the hard-disk drive bracket.

See “Drives” found later in this chapter.

2. Remove the speaker connector from the indicator card.

3. Disconnect the indicator cable from the system board.

Slide the indicator cable through the cable slot in the bottom of the chassis.

4. Remove the mounting screw holding the indicator card to the chassis.

5. Rotate the card to the left, and lift it out of the hooks holding it to the chassis.

Removing and Replacing Parts 4-7

peaker

speaker connector

speaker

Figure 4-7. Speaker Removal

retaining slot

To remove the speaker, follow these steps:

1. Remove the hard-disk drive bracket.

See “Drives” found later in this chapter.

2. Remove the speaker connector from the indicator card.

3. Lift the speaker out of the retaining slots on the front of the chassis.

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rives

Figure 4-8 shows an example of drive hardware that can be installed in the system unit. Refer to this figure when you perform any of the procedures in the following subsections.

system power supply

power input connectors

DC power cable

DSKT connector

IDE2 connector

two-bay drive cage

diskette/tape drive interface cable

3.5-inch diskette drive

CD-ROM/tape drive interface cable

hard-disk drive bracket

IDE1 connector

Figure 4-8. Drive Hardware

Removing and Replacing Parts 4-9

Drives in the Drive Cage

retaining screw

bracket mounting screw (2)

hook (2)

bracket catch

Figure 4-9. 3.5-Inch Diskette Drive Removal

To remove a drive from the 3.5-inch diskette drive bay, follow these steps:

1. Disconnect the DC power cable and the interface cable from the back of the drive.

2. Remove the bracket retaining screw.

3. Release the bracket catch from the chassis.

Rotate the drive bracket to the right, and lift the bracket from the top of the drive bay.

4. Remove the two mounting screws from each side of the drive and remove the drive from the bracket.

T o replace a 3.5-inch diskette drive, locate the two hooks on the right side of the bracket that hold the drive in position. Engage those two hooks in the side of the drive.

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retaining tab (2)

Figure 4-10. 5.25-Inch Drive Removal

To remove a 5.25-inch drive from the middle or lower drive bay, follow these steps:

1. Disconnect the DC power ca ble and th e interfac e cable fr om the bac k of the drive.

2. Press out on the two retaining tabs on the sides of the drive bay, slide the drive forward, and remove it from the drive bay.

Removing and Replacing Parts 4-11

Hard-Disk Drives

handle

screw

hook (2)

hard-disk drive bracket

Figure 4-11. Hard-Disk Drive Bracket Removal

To remove a hard-disk drive bracket, follow these steps:

1. Disconnect the DC power cable(s) and the interface cable(s) from the back of the drive(s).

2. Remove the screw that secures the hard-disk drive bracket to the chassis.

3. Grasp the handle on the front of the bracket, and rotate the bracket back until it swings free from the chassis.

Disengage the bracket from the two hooks on the bottom of the chassis support.

4. Lift the hard-disk drive bracket out of the system unit.

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drive-bracket mounting screw (4)

hard-disk drive

hard-disk drive bracket

Figure 4-12. Hard-Dis k Drive Removal

To remove a hard-disk drive, follow these steps:

1. Remove the hard-disk drive bracket from the system unit.

See the preceding procedure.

2. Remove the four screws that secure the hard-disk drive(s) to the bracket.

3. Slide the drive(s) out of the hard-disk drive bracket.

Removing and Replacing Parts 4-13

ystem Power Supply

power supply

securing tab

DC power cable (8)

slot

hook

system board

Figure 4-13. Power Supply Removal

To remove the system power supply, follow these steps:

1. Disconnect the AC power cable from the back of the power supply.

2. Disconnect the DC power cables from the system board, drives, and expansion cards.

3. Free the system power supply from the securing tab labeled

“RELEASE —>,”

and rotate it to the right until it stops .

4-14 Dell OptiPlex GX

Press the securing tab to the left to disengage the power supply.

4. Free the power cab le bundl e fr om the hook on the bottom o f the chas sis.

5. Lift the front end of the system power supply up, and move it to the right to disengage the power supply from the slot in the chassis.

6. Lift the system power supply from the system unit.

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icroprocessor Fan

lock

microprocessor

latching tab (4)

fan

fan connector

power cable

Figure 4-14. Microprocessor Fan Removal

To remove the system power supply, follow these steps:

1. Rotate the power supply to the right to access the microprocessor fan connector.

See “System Power Supply,” found earlier in this chapter.

2. Sqeeze the latch and pull out the fan power cable from the microprocessor fan connector located on the system board under the power supply.

3. Gently pull the plastic lock, and push down on the fan to disengage the four latching tabs holding the fan to the back of the chassis.

4. Remove the fan.

Pull the fan forward and out of the system unit.

Removing and Replacing Parts 4-15

microphone jack (NIC-IN)

speaker-out jack (SPKR-OUT)

line-in jack (LINE-IN)

riser board power connector (RSR PWR1)

ystem Board Components

The subsections that follow contain procedures for removing system board components.

NIC connector (ENET)

USB connectors(2) (USB)

serial port 2 connector (SERIAL2)

keyboard/mouse connectors (stacked) (KYBD/MOUSE)

serial port 1/parallel port connectors (stacked) (PARALLEL/SERIAL)

microprocessor fan connector (FAN)

battery socket (BATTERY)

DIMM sockets (4) main power input

connector (POWER1)

riser board connector (RISER)

riser board power connector (RSR PWR2)

secondary microprocessor card (or terminator card) connector (2ND_CPU)

front of system unit

primary EIDE interface connector (IDE1)

jumpers

control panel connector (PANEL)

Figure 4-15. System Board Components

microprocessor socket (MICROPROCESSOR)

3.3-V power input connectors (POWER2)

CD-ROM connector (CD_IN)

diskette/tape drive interface connector (DSKT)

secondary EIDE interface connector (IDE2)

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Expansion Cards

The system unit has a removable expansion-card cage. The expansion cards fit into connectors on a riser board. Dell recommends that you remove the expansion-card cage first before removing or installing expansion cards.

Expansion-Card Cage

lever expansion-

card cage

notch

chassis

Figure 4-16. Expansion-Card Cage Removal

To remove an expansion-card cage, follow these steps:

1. Disconnect any cables from the expansion cards and the riser board.

2. Rotate the lever toward the back of the system unit until it stops in the upright position.

3. Lift the expansion-card cage up and away from the system unit.

To replace an expansion-card cage, keep the cage flush against the chassis to insure that the lever engages the notch when the lever is depressed.

Removing and Replacing Parts 4-17

Expansion Card

expansion card

retaining screw

card-mounting bracket

expansion-card connector

card-slot opening

riser board

Figure 4-17. Expansion-Card Removal

To remove an expansion card, follow these steps:

1. Remove the expansion-card cage.

See the preceding procedure.

2. Remove the retaining screw from the card-mounting bracket.

3. Grasp the expansion card by its corners, and carefully remove it from the expansion-card connector.

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Riser Board

retaining screw (2)

slot (2)

expansion-card cage

Figure 4-18. Riser Board Removal

To remove the riser board, follow these steps:

riser board

1. Remove the expansion-card cage and all expansion cards.

See the preceding two procedures.

2. On a flat work surface, turn the expansion-card cage over, with the riser board facing you.

3. Remove the riser-board retaining screws.

4. Slide the riser board down approximately one-half inch to release the board from the two slots on the expansion-card cage.

5. Lift the riser board away from the expansion-card cage.

Removing and Replacing Parts 4-19

DIMMs

DIMM

securing clip (2)

Figure 4-19. DIMM Removal

To remove a DIMM, push outward on the DIMM socket’s securing clips until the DIMM is released from its socket. Then lift the DIMM away from the socket.

DIMM

securing clip (2)

4-20 Dell OptiPlex GX

Figure 4-20. DIMM Installation

To replace a DIMM, press outward on the securing clips at each end of the socket until they snap open. Orient the DIMM to the socket, and press the DIMM straight down into the socket slot until the securing clips snap into place around the ends of the DIMM.

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Microprocessor/Heat Sink Assembly

heat sink

microprocessor securing clip hooks over tabs on socket (front and back)

microprocessor socket

release lever

Figure 4-21. Microprocessor Securing Clip

To remove the microprocessor/heat sink assembly, follow these steps:

1. Remove the microprocessor securing clip fr om the micropr ocessor/heat sink assembly.

microprocessor

WARNING: The microprocessor chip can get extremely hot during system operations. Be sure the chip has had sufficient time to cool before touching it.

Press down on the folded part of the clip with a small screwdriver to relea se the clip.

2. Push outward and then upward on the microprocessor release lever to rotate the lever to its fully vertical position.

3. Lift the microprocessor/heat sink assembly out of its socket (see Figure 4-22).

To install the replacement micro pr ocessor/heat sink assembly, ensure that the microprocessor release lever is in its fully vertical position to allow the microprocessor pins to easily slip into the socket. When the microprocessor/heat sink assembly is in place, rotate the microprocessor release lever to its horizontal position. Hook the microprocessor securing clip over the socket tab nearest the front of the system board, and then snap it over the tab on the back of the socket.

NOTE: Pin 1 on the microprocessor is located on the corner with the largest bevel. The pin-1 hole in the microprocessor socket is located on the corner where the holes are in a diagonal pattern.

Removing and Replacing Parts 4-21

securing clip

heat sink

thermal interface pad

microprocessor

microprocessor socket

pin-1 corner of socket

front tab

Figure 4-22. Microprocessor Removal

If you are installing a new microprocessor/heat sink assembly, you need to place the thermal interface pad that comes with the replac ement microprocessor between the microprocessor and the heat sink before reinstalling the securing clip.

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Terminator or Add-In Card

The system unit may have a terminator card or a secondary microprocessor (dual-processing systems) on an add-in card installed on the system board . This section describes removing and replacing the terminator card and the add-in card.

Terminator Card

handle

terminator card

Figure 4-23. Terminator Card Removal

To remove a terminator card, follow these steps:

1. Grasp the small white “handle” installed on the top of the card.

If a handle is not installed, use the handle that is in the upgrade kit with the secondary microprocessor. Fit the handle over the top of the card so t hat the nubs of the handle fit through two holes in the top of the card.

2. Pull straight up on the card to free it from the connector.

Removing and Replacing Parts 4-23

Add-In Card

mountingbracket edge

card guide

mounting-bracket edge tab

metal mounting bracket

Figure 4-24. Add-In Card Removal

To remove an add-in card, follow these steps:

1. Gently grip the card’s metal mounting bracket with both hands.

2. Pull up until the card is freed from the connector.

To reinstall the card, with the metal mounting bracket facing the left side of the chassis, fit the edge of the bracket into the card guide attached to the back wall of the chassis. Make sure that the bracket edge tab is below the bottom of the guide.

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System Battery

battery

BATTERY socket

Figure 4-25. System Battery Removal

To remove the system battery, follow these steps:

1. If possible, enter the System Setup program, and make a printed copy of the System Setup screens.

2. Rotate the power supply out of the way.

See “System Power Supply” found earlier in this chapter.

3. Remove the battery.

Pry the battery out of its socket with your fingers or with a blunt, nonconducting object, such as a plastic screwdriver.

To replace the system battery, follow these steps.

WARNING: There is a danger of the new battery exploding if it is incorrectly installed. Replace the battery onl y with the same or equival ent type recommended by the manu facturer. Discard used batterie s according to the manufacturer’s instructions.

1. Orient the new battery with the “+” facing up. Insert the battery into its socket and snap it into place.

Rotate the power supply back into position.

2. Start the System Setup program, and reset the Date and Time cat egories.

Also, compare the system configuration information with the copy of the system configuration settings you made in step 1 of the removal procedure. Restore any system configuration information that was lost while replacing the battery.

Removing and Replacing Parts 4-25

ystem Board

screw

slot (7)

Figure 4-26. System Board Removal

To remove the system board, follow these steps:

1. Disconnect all cables from their connectors at the back of the system unit.

2. Remove the expansion-card cage.

3. Remove the microprocessor fan.

4. Disconnect all cables from the system board.

Remove the hard-disk drive power cable(s). Slide any drives in the

5.25-inch bays toward the front of the system unit, but leave them cabled.

5. Remove the system board as follows:

a. Remove the screw that secures the system board to the bottom of the

system unit.

b. Slide the system board toward the front of the system unit approxi-

mately one-half inch to release the board from the seven slots in the floor of the system unit.

c. Lift the system board out of the system unit.

If you are replacing a system board, remove the DIMMs, the microprocessor, the terminator or add-in card, and the expansion-card cage from the old system board and install them on the replacement board.

4-26 Dell OptiPlex GX

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Systems Service Manual

Appendix A

System Setup Program

his appendix describes the System Setup program, which is used to change

the system configuration information stored in NVRAM on the system board. To enter the System Setup program, follow these steps:

1. Turn on (or reboot) the system.

2. Press <Ctrl><Alt><Enter> immediately after the monitor displays the message Press <CTRL><ALT><ENTER> for System Setup.

If you wait too long, the operating system begins to load into memory, the message disappears, and you cannot enter the System Setup program. Let the

system complete the load operation; then shut down the system and try again. NOTE: To ensure an orderly system shutdown, consult the documentation

that accompanied the operating system.

System Setup Program A-1

Page 1 of 2

ystem Setup Screens

Dell Computer Corporation

System OptiPlex GXpro 200 Setup

BIOS Version:

XXX

Time: 13:17:02 Diskette Drive A:

Diskette Drive B: Drive A Location: Top

Drives: Primary Type Cyls Hds Pre LZ Sec Size

Drive 0: Auto 524 32 -1 524 63 540 Drive 1: None

Secondary Drive 0: Auto Packet Interface Device Drive 1: None

Base Memory: 640 KB Extended Memory: 63 MB Reserved Memory: None Fast Video BIOS: On CPU Speed: 200 MHz

Tab,Shift-Tab change fields

Page 2 of 2

Keyboard Errors: System Password: Password Status: Boot Sequence: Setup Password: Auto Power On: Power Management:

Integrated Devices Sound: On NIC: On Mouse: On Serial Port 1: Auto Serial Port 2: Auto Parallel Port: 378h Parallel Mode: AT IDE Hard Disk: Auto Diskette: Auto USB: On Speakers: On

Tab,Shift-Tab change fields

Date: Mon Jan 6, 1997

3.5 inch, 1.44 MB Not Installed

change values Esc exit

Dell Computer Corporation

System OptiPlex GXpro 200 Setup

Report

Not Enabled

Unlocked

Diskette First

Not Enabled

Mon-Fri 07:30

Regular

change values

This category sets the time in 24-hour format (hours:minutes: seconds) for the internal clock/ calendar.

To change the value in a field, enter a number or use the leftor right-arrow key.

Microprocessor: Pentium Pro-200 Level 2 Cache: 512 KB Integrated System Memory: 64 MB ECC EDO Service Tag:

This category determines whether keyboard-related error messages are reported at system startup.

Microprocessor: Pentium Pro-200 Level 2 Cache: 512 KB Integrated System Memory: 64 MB ECC EDO Service Tag:

Alt-P next

XXXXX

Alt-B reboot

BIOS Version:

XXXXX

Esc exit

Alt-B reboot

XXX

A-2 Dell OptiPlex GX

Figure A-1. System Setup Screens

pro

Systems Service Manual

Table A-1. System Setup Categories

Category

Function

Time Resets time on system’s internal clock. Date Resets date on system’s internal calendar. Diskette Drive A

Diskette Drive B

Identifies type of diskette drives installed. Category options always match physical locations of drives in system unit. Tape drives are not reflected in these categories.

Drive A Location Identifies which diskette drive is used as the

boot drive.

Drives: Primary Secondary

Identifies drives attached to the IDE1 and IDE2 connectors on system board. Each EIDE connector supports two EIDE drives (Drive 0 and Drive 1).

For EIDE hard-disk drives, the system provides an automatic drive-type detect feature. To use this feature, highlight the appropriate drive category and type a (for automatic).

If none of the supported drive types match the parameters of the new drive, enter the parameters directly. To do so, highlight the appropriate drive category (Drive 0 and Drive 1) and type u to display User1. Press <Tab> to highlight each of the parameter fields in succession, and enter the appropriate number for each field.

NOTE: For EIDE devices such as EIDE CD-ROM drives and EIDE tape drives that are using the built-in EIDE controller, set the appropriate Drive category to Auto.

Base Memory Displays amount of memory available to

MS-DOS programs that do not use extended or expanded memory.

Extended Memory Displays amount of memory available as

extended memory.

System Setup Program A-3

Table A-1. System Setup Categories

(continued)

Category

Function

Reserved Memory Designates a region of system board memory

that can be supplied by an expansion card. This feature should not be enabled unless an

expansion card that requires special addressing is installed.

Fast Video BIOS Enables shadowing and caching the BIOS for a

video card installed in an expansion slot.

NOTE: Some video cards are not designed to be shadowed or cached. If video problems occur, try setting Fast Video BIOS to Off.

CPU Speed Indicates processor speed at which system

boots—the processor’s rated speed or a slower compatibility speed.

Num Lock Determines whether keyboard’s Num Lock

mode is activated.

Keyboard Errors Enables or disables reporting of keyboard

errors during POST.

System Password Displays current status of system’s password

security feature. Also used to assign and verify a new password.

Password Status Provides an extra measure of system security

by letting you set the system password to Locked or Unlocked.

Boot Sequence Determines whether system boots from dis-

kette (if present) or hard-disk drive.

Setup Password Restricts access to System Setup program.

A-4 Dell OptiPlex GX

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Systems Service Manual

Table A-1. System Setup Categories

(continued)

Category

Function

Power Management With the Power Management category

enabled, DPMS monito rs an d most E IDE drives automatically switch into low-pow er mode during p eriod s of s yste m ina ctivit y.

CAUTION: Before enabling this feature, check the monitor documentation to make sure the system has a DPMS-compliant monitor. Otherwise, there is a risk of damaging the monitor.

NOTE: Not all EIDE hard-disk drives support this feature. Enabling this feature for drives that do not support it may cause the EIDE drive to become inoperable until the system is restarted and the Power Management category is disabled.

Sound Enables (On [default]) or disables (Off) the

audio controller.

NIC Enables (On) or disables (Off) the network

interface controller.

Mouse Enables or disables the built-in PS/2-

compatible mouse port.

Serial Port 1

Configures system’s built-in serial ports.

Serial Port 2 Parallel Port Configures system’s built-in parallel port. The

port’s I/O address may be set to 278H, 3BCH, or 378H. Otherwise, the p ort may be di sabled.

Parallel Modes Controls whether system’s built-in parallel port

acts as an AT-compatible (unidirectional) or PS/2-compatible (bidirectional) port.

IDE Hard Disk Enables system’s built-in EIDE hard-disk drive

interface. Diskette Enables system’s built-in diskette controller. USB Enables (On) or disables (Off [default]) the

USB connectors.

NOTE: This category appears only on GXpro

systems containing the 10/100-Mbps Ethernet

NIC.

Speaker Enables on-board speaker.

System Setup Program A-5

Table A-1. System Setup Categories

(continued)

Category

Function

Microprocessor Displays type of microprocessor installed. Level 2 Cache Displays size of level-2 cache memory in

microprocessor.

System Memory Displays entire amount of installed memory

detected in system, except for memory on EMS expansion cards.

If EDO DIMMs are installed, EDO is displayed next to this category.

Service Tag Displays system’s five-character service tag

number.

Asset Tag Displays the asset tag number up to ten charac-

ters if one is assigned.

A-6 Dell OptiPlex GX

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Systems Service Manual

Index

Numbers

3.3-V power input connectors

, 1-12, 4-16

AC power receptacle add-in card, removal audio controller

, 1-4

, 4-24

, 1-6

battery

illustrated removing and replacing

socket beep codes BIOS chip boot routine, observing when trouble-

shooting

bracket

hard-disk drive

, 4-25

, 1-12, 4-16

, 3-1

, 1-12, 4-16

, 2-3

, 1-4, 4-12

CD-ROM

connector drives

chassis

, 1-12

, 4-11

, 1-4

computer, technical specifications configuration jumpers, location

, 1-12, 4-16

connectors

location on back of system unit location on system board

cover, system unit, removal

, 1-12, 4-16

, 4-4

DC power DC power cables DC power connectors DC power distribution

diagram diagnostics DIMMs

about

location

removal

, 1-4, 1-8, 1-10

, 1-4

, 1-8

, 1-11

, 2-5

, 1-13

, 1-12, 4-16 , 4-20

, 1-16

, 1-4

cables

DC power diskette/tape drive interface EIDE

card-slot opening

, 1-4, 1-10

, 4-9

, 1-4, 4-18

, 1-4

diskette drives

interface cable

interface connector

removal

, 4-10, 4-11

, 1-4

, 1-12, 4-16

diskette-based diagnostics DREQ line assignments drive cage drive hardware

, 1-4, 4-10

, 4-9

, 1-15

, 2-5

Index 1

drives

, 1-17, 4-9

DSKT connector dual-processing

ECC DIMMs EDO DIMMs

, 1-2

, 1-2, 1-13

, 1-12, 4-16

, 1-5

hard-disk drive access indicator hard-disk drives

about

, 1-6

bracket connectors location removal

help, getting

, 1-4, 4-12

, 1-12, 4-9, 4-16

, 1-4

, 4-13

, 2-6

, 1-4

EIDE connectors

, 1-12, 4-9, 4-16

eject button

removal

, 4-5

enhanced dual-interface EIDE subsystem

1-6

error messages, system, list of ESD

, 4-2

, 3-3

expansion cards

card-slot opening connectors removal

, 1-12, 4-16

, 4-18

expansion slots expansion subsystem, advanced

, 1-4, 4-17, 4-18

, 1-5

expansion-card cage

removal

external visual inspection

, 4-17

, 2-2

IDE1 connector IDE2 connector

, 1-12, 4-9, 4-16 , 1-12, 4-9, 4-16

indicator card, removal indicators

, 1-4

initial procedures initialization, error messages interface cables

, 1-4

interrupt assignments, list of ISA expansion cards

4-18

, 4-7

, 2-1

, 3-3

, 1-14

, 1-5, 1-12, 4-16, 4-17,

fan connector fatal error messages floor stand, removal front panel front-panel inserts, removal

2 Dell OptiPlex GX

, 1-12, 4-16

, 3-3 , 4-3

, 1-4

pro

Systems Service Manual

, 4-6

jumpers, list of

, 1-14

key combinations, to enter System Setup

program

keyboard connector

location

, A-1

, 1-4, 1-12, 4-16

LINE-IN connector line-in jack

, 1-4, 1-12, 4-16

, 1-12, 4-16

Plug and Play expansion cards POST beep codes

, 3-1

power button

location

removal

, 1-4 , 4-5

, 1-5

memory, main messages, error microphone jack microprocessor

release lever removal secondary, removal socket

, 1-12, 4-16

microprocessor fan

removal

mouse connector

location on back panel location on system board

, 1-2, 1-13

, 3-3

, 1-4, 1-12

, 4-21

, 4-23

, 4-15

NIC

description location

, 1-7

, 1-4, 1-12

, 1-4

, 1-12, 4-16

power distribution diagram power indicator power input connectors power supply

cable configuration

DC voltage ranges

illustrated

removal precautions

, 1-4

, 1-12, 4-16

, 1-8

, 1-10

, 1-8

, 1-10

, 4-14

, 4-2

reset button

location

removal resource conflicts

eliminating riser board

connector

power connector

removal

, 1-4 , 4-5

, 2-5

, 1-12

, 4-19

, 1-11

padlock PANEL connector Panel connector parallel port connector

PCI expansion cards

PCI video card

, 4-4

location

4-18

, 4-16

, 1-12

, 1-4, 1-12, 4-16

, 1-6

, 1-5, 1-12, 4-16, 4-17,

secondary microprocessor serial port connectors, location SMART support

, 1-8

sockets

battery

DIMM speaker, removal

, 1-12, 4-25

, 1-12, 4-16, 4-20

, 4-8

specifications, technical SPKR-OUT connector

, 4-23

, 1-16

, 1-12, 4-16

, 1-4

Index 3

subsystems

advanced expansion

, 1-5

enhanced dual-interface EIDE main memory video memory

switch, voltage selection

, 1-13

, 1-12

, 1-4

system board

components removal illustrated jumpers

, 1-12

, 1-13

location inside chassis removing and replacing

system board jumpers

, 4-16

, 1-4

, 4-26

, 1-13

system error messages, list of

, 3-3

, 1-6

troubleshooting

boot routine, interpreting external visual inspection initial procedures initial user contact

, 2-1

internal visual inspection

USB

description location

user contact, initial

, 1-7

, 1-4, 1-12

, 2-1

, 2-3

, 2-2

, 2-4

system features system power supply System Setup program system specifications

, 1-2

, 1-8

, A-1

, 1-16

system unit

cover

, 4-4

floor stand removal orientation

, 1-3

, 4-3

tape drives

interface cable interface connector removal

, 4-10, 4-11

technical specifications terminator card, removal

, 1-4

, 1-12, 4-16

, 1-16

, 4-23

video connector

location video subsystem visual inspection

external

internal voltage selection switch

, 1-4

, 1-6

, 2-2

, 2-4

, 1-4

thermal monitoring

4 Dell OptiPlex GX

, 1-7

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Systems Service Manual

Dell OptiPlex 100-Mbps User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Contents

System Overview

Dual-Processor Capability

Advanced Expansion Subsystem

Hard-Disk Drive Options

Enhanced Dual-Interface EIDE Subsystem

Audio Controller

PCI Video Card

Desktop Chassis

Thermal Monitoring

System Power Supply

Pin Assignments for the DC Power Connectors

DC Power Distribution

System Board Layout

Video Memory

Main Memory

System Board Jumpers

Basic Troubleshooting

Beep Codes and Error Messages

Removing and Replacing Parts

indicator card

speaker

Drives in the Drive Cage

Hard-Disk Drives

Expansion Cards

Expansion-Card Cage

Expansion Card

Riser Board

DIMMs

Microprocessor/Heat Sink Assembly

Terminator or Add-In Card

Terminator Card

Add-In Card

System Battery

System Setup Program

Index