Dell 100-Mbps User manual

Brand: Dell

Model: 100-Mbps

Category: Networking

Type: User manual

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Information in this document is subject to change without notice.



Reproduction in any manner whatsoever without the written permission of Dell Computer Corporation is strictly forbidden.

Trademarks used in this text: Dell, the DELL logo, and OptiPlex 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 NetWare are registered trademarks

of Novell, Inc.; IBM is a registered trademark of International Business Machines Corporation; 3Com is a registered trademark of 3Com Corporation.

Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products. Dell Computer

Corporation disclaims any proprietary interest in trademarks and trade names other than its own.

December 1996 P/N 84577

Contents

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

vii

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

viii

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

ead This First

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:

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

A prerequisite for using this manual to service Dell computer systems is a

basic knowledge of IBM

-compatible PCs and prior training in IBM-

compatible PC troubleshooting techniques. In addition to information

provided in this manual and the User’s Guide that came with the system, Dell

provides the Diagnostics and Troubleshooting Guide for troubleshooting pro-

cedures and instructions on using the Dell diagnostics to test the computer

system.

WARNING: A WARNING indicates the potential for bodily harm and pro-

vides 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.

System Overview 1-1

Chapter 1

System Overview

his service manual covers the Dell

OptiPlex

GXpro high-speed, upgrad-

able desktop systems, which use the Intel

Pentium

Pro family of

microprocessors. These Dell systems incorporate the high-performance PCI

local bus as well as the ISA expansion bus. These buses are built into the system

board, which also integrates a 3.3-V Pentium Pro microprocessor and all other

elements of the basic computer system.

The Pentium Pro microprocessor contains a built-in clock multiplier circuit,

which increases the microprocessor’s internal operating frequency to a multiple

of the system clock frequency. The microprocessors for each of these systems

and their operating frequencies are as follows:

•

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

frequency of 60 MHz

•

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

frequency of 66 MHz

Dell OptiPlex GXpro systems contain either an integrated 10-Mbps or

10/100-Mbps 3Com

NIC, both of which are covered in this document.

1-2 Dell OptiPlex GX

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Systems Service Manual

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 Chap-

ter 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.

System Overview 1-3

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.

back of system unit

right side

left side

front of system unit

1-4 Dell OptiPlex GX

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Systems Service Manual

Figure 1-2. Front-Panel Features

Figure 1-3. Internal View

reset button

hard-disk drive access indicator

power button

power indicator

parallel port connector

drive cage

DC power cable

diskette/tape drive

interface cable

hard-disk drive

bracket

power supply

system board

voltage

selection switch

AC power

receptacle

serial port 1 connector

serial port 2 connector

keyboard connector

mouse connector

video connector

card-slot openings

NIC connector

microphone jack

speaker-out jack

line-in jack

3.5-inch drive

expansion-card

cage

chassis

USB connector (2)

System Overview 1-5

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 micro-

processor 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, Windows NT 4.0, and Novell

NetWare

SMP (symmetric

multiprocessing) operating systems. The microprocessor chips 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 automati-

cally 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 provides instructions for using it to con-

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).

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

ISA2

ISA1

PCI 5

PCI1

JHDLED connector

JMIDI connector

1-6 Dell OptiPlex GX

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Systems Service Manual

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. Hard-

disk drives should be installed in the internal hard-disk drive bracket described

in the previous subsection, “Hard-Disk Drive Options.” For detailed information

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 ViBRA 16 audio controller

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 Laborato-

ries, 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-resolution 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.

System Overview 1-7

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 connec-

tor on the back panel of the computer.

The 10/100-Mbps NIC supports a 10-Mbps direct connection to either a cate-

gory-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, print-

ers, 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 sys-

tem 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.

1-8 Dell OptiPlex GX

pro

Systems Service Manual

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 condi-

tion. Therefore, when you measure these voltages, the DC power connectors

must be connected to their corresponding power input connectors on the system

board or drives.

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.

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

+4.75 to +5.25 VDC 10 mA

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

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

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

System Overview 1-9

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

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 special applications.

Pin 5 — PWRGOOD should measure between +4 and +5 VDC when the power 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

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

PWRGOOD

(orange)

–12 VDC (blue)

+12 VDC (yellow)

+5 VFP (purple)

common (black)

234 5678 910

12 13 14 15 16 17 18 19 20

+5 VDC (red)

common (black)

PSON#

(gray)

common (black)

–5 VDC (white)

TFSC

(brown)

1234

+5 VDC (red)

common (black)

+12 VDC (yellow)

1234

+5 VDC (red)

common (black)

+12 VDC (yellow)

P2, P3,

P5, P6

1-10 Dell OptiPlex GX

pro

Systems Service Manual

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

Figure 1-8. DC Power Cables

1234

+3.3 VDC (blue/white)

common (black)

+3.3 VDC (blue/white)

common (black)

System Overview 1-11

Figure 1-9. Power Distribution

+5 VDC

+12 VDC

–12 VDC

+12 VDC

–12 VDC

3.5-inch

diskette drive

system

power supply

PSON#

+5 VFP

+5 VDC

–5 VDC

+12 VDC

–12 VDC

PWRGOOD

PSON#

+5 VFP

+5 VDC

–5 VDC

+12 VDC

–12 VDC

power

management

logic

keyboard

controller

battery

+3 VDC

POWER1

+5 VDC

–5 VDC

+12 VDC

–12 VDC

+5 VDC

–5 VDC

ISA1,

ISA2

PCI1

through

PCI5

MICROPROCESSOR

+5 VDC

PANEL

USB

KYBD

MOUSE

DIMM_A

DIMM_B

DIMM_C

DIMM_D

main memory

sockets

FAN

RISER

internal

hard-disk drive

optional

drive

+5 VFP

RTC/

NVRAM

+3.3 VDC

2ND_CPU

riser board

system board

optional

drive

internal

hard-disk drive

POWER2

+3.3 VDC

processor

core regulator

+2.1–3.5 VDC

+3.3 VDC

+2.1–3.5 VDC

FUSE

1-12 Dell OptiPlex GX

pro

Systems Service Manual

System Board Layout

The subsections that follow provide service-related information about the sys-

tem board components.

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.

serial port 2

connector

(SERIAL2)

serial port 1/parallel

port connectors (stacked)

(PARALLEL/SERIAL)

diskette/tape drive interface

connector (DSKT)

front of system unit

primary EIDE

interface connector (IDE1)

DIMM sockets (4)

microprocessor socket

(MICROPROCESSOR)

riser board

connector (RISER)

battery socket

(BATTERY)

secondary EIDE interface

connector (IDE2)

NIC

connector

(ENET)

jumpers

microprocessor fan

connector (FAN)

speaker-out jack

(SPKR-OUT)

line-in jack (LINE-IN)

microphone jack (NIC-IN)

CD-ROM

connector (CD_IN)

control panel

connector (PANEL)

main power input

connector (POWER1)

3.3-V power

input connectors

(POWER2)

secondary microprocessor

card (or terminator

card) connector (2ND_CPU)

keyboard/mouse

connectors

(stacked)

(KYBD/MOUSE)

riser board power

connector

(RSR PWR2)

riser board power

connector (RSR PWR1)

USB

connector

(USB)

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Dell 100-Mbps User manual

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Category: Networking

Type: User manual

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