Dell XPS H233, XPS H266 User Manual

'HOO'LPHQVLRQ

6(59,&(0$18$/



;36+DQG;36+6\VWHPV



'HOO'LPHQVLRQ;36

6(59,&(0$18$/



+DQG;36+6\VWHPV



Information in this manual is subject to change without notice.

Reproduction in any m an ner whatsoever without the written permission of Dell Comput er Corporation is strictly forb idden. Trademarks used in this text: Dell, the DELL logo, and Dell Dimension are registered trademarks of Dell Computer Co rporation; Intel and Pentium are registered

trademarks and MMX is a trademark of Intel Corporation; Microsoft, MS-DOS, Windows NT, and W indows are registered trademarks of Microsoft Corporation; IBM is a registered trademark of International Business Machine s Corpo ration; VESA is a registered trademark of Video Electronics Standards Association.

Other trademarks and tr ade names may be used in this docum ent to refer to either the ent itie s cla i mi ng the marks and names or their products. Dell Computer Corporation disclai m s a ny proprietary interest in trad emarks and trade names other th an its own.

May 1997 P/N 84980

Chapter 1

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

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

Advanced Expansion Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

EIDE Subsystem. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

Hard-Disk Drive Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

Computer Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

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

DC Power Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

DC Power Connector Pin Assignments . . . . . . . . . . . . . . . . . . . . . . 1-11

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

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

System Board Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14

Interrupt Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16

DMA Channel Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17

Technical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18

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 Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

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

Precautionary Measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Computer Cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Front Bezel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

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

Front-Panel Insert. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Drive Cage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

5.25-Inch Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Upper 3.5-Inch Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Lower 3.5-Inch Drive (Mini Tower Computer Only) . . . . . . . . . . . . . . . 4-8

3.5-Inch Diskette Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9

Primary Hard-Disk Drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

Secondary Hard-Disk Drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11

Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13

Microprocessor Fan Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14

Card Guide Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15

Control Panel Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16

System Board Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17

Expansion Cards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18

SIMMs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19

SEC Cartridge and Heat Sink Assembly . . . . . . . . . . . . . . . . . . . . . . . . 4-20

Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21

System Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-22

Appendix A

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

System Setup Screens. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-1

Main Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-2

IDE Device Configuration Submenu . . . . . . . . . . . . . . . . . . . . . . . . .A-4

Boot Options Submenu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-5

Advanced Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-7

Peripheral Configuration Submenu . . . . . . . . . . . . . . . . . . . . . . . . . .A-8

Chipset Configuration Submenu. . . . . . . . . . . . . . . . . . . . . . . . . . . .A-10

Plug and Play Configuration Submenu. . . . . . . . . . . . . . . . . . . . . . .A-11

Security Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-12

Power Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-13

Exit Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-15

Index

Figures

Figure 1-1. Computer Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Figure 1-2. Desktop Computer Features. . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Figure 1-3. Mini Tower Computer Features. . . . . . . . . . . . . . . . . . . . . . . . 1-5

Figure 1-4. Back-Panel Features (Typical). . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Figure 1-5. DC Power Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

Figure 1-6. DC Power Distribution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

Figure 1-7. DC Power Connector P1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

Figure 1-8. DC Power Connectors P2, P3, P4, P5, and P6. . . . . . . . . . . . 1-12

Figure 1-9. DC Power Connector P7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

Figure 1-10. System Board Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13

Figure 1-11. System Board Jumpers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14

Figure 4-1. Computer Cover Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Figure 4-2. Front-Bezel Removal (Mini Tower Chassis). . . . . . . . . . . . . . 4-3

Figure 4-3. Front-Bezel Removal (Desktop Chassis). . . . . . . . . . . . . . . . . 4-3

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

Figure 4-5. Drive Cage Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Figure 4-6. 5.25-Inch Drive Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Figure 4-7. Upper 3.5-Inch Drive Removal . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Figure 4-8. Lower 3.5-Inch Drive Removal

(Mini Tower Computer Only) . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

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

Figure 4-10. Primary Hard-Disk Drive Removal . . . . . . . . . . . . . . . . . . . . 4-10

Figure 4-11. Secondary Hard-Disk Drive Assembly Removal . . . . . . . . . 4-11

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

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

vii

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

Figure 4-15. Card-Guide Assembly Removal . . . . . . . . . . . . . . . . . . . . . . 4-15

Figure 4-16. Control-Panel Board Removal . . . . . . . . . . . . . . . . . . . . . . . 4-16

Figure 4-17. System Board Components . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17

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

Figure 4-19. SIMM Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19

Figure 4-20. SIMM Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19

Figure 4-21. SEC Cartridge and Heat Sink Removal. . . . . . . . . . . . . . . . . 4-20

Figure 4-22. Battery Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21

Figure 4-23. System Board Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-22

Figure 4-24. System Board Mountings . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23

Figure 4-25. Guide-Bracket Assembly Removal. . . . . . . . . . . . . . . . . . . . 4-24

Figure A-1. Main Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-2

Figure A-2. IDE Device Configuration Submenu. . . . . . . . . . . . . . . . . . . .A-4

Figure A-3. Boot Options Submenu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-5

Figure A-4. Advanced Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-7

Figure A-5. Peripheral Configuration Submenu. . . . . . . . . . . . . . . . . . . . .A-8

Figure A-6. Chipset Configuration Submenu . . . . . . . . . . . . . . . . . . . . . .A-10

Figure A-7. Plug and Play Configuration Submenu . . . . . . . . . . . . . . . . .A-11

Figure A-8. Security Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-12

Figure A-9. Power Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-13

Figure A-10. Exit Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-15

Tables

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

Table 1-2. System-Board Jumper Descriptions . . . . . . . . . . . . . . . . . . . 1-15

Table 1-3. Interrupt Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16

Table 1-4. DMA Channel Assignments . . . . . . . . . . . . . . . . . . . . . . . . . 1-17

Table 1-5. Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18

Table 3-1. POST Beep Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

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

Table A-1. Main Screen Categories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-2

Table A-2. IDE Device Configuration Submenu Categories . . . . . . . . . .A-4

Table A-3. Boot Options Submenu Categories . . . . . . . . . . . . . . . . . . . . .A-5

Table A-4. Advanced Screen Categories. . . . . . . . . . . . . . . . . . . . . . . . . .A-7

Table A-5. Peripheral Configuration Submenu Categories. . . . . . . . . . . .A-8

viii

Table A-6. Chipset Configuration Submenu Categories . . . . . . . . . . . . . A-10

Table A-7. Plug and Play Configuration Submenu Categories . . . . . . . . A-11

Table A-8. Security Screen Categories . . . . . . . . . . . . . . . . . . . . . . . . . .A-12

Table A-9. Power Screen Categories . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-13

Table A-10. Exit Screen Categories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-15

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 the online System User’s Guide that came with the syste m, Dell provides the Diagnostics and Troubleshooting 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

he Dell Dimension® XPS H233 and XPS H266 systems are high-speed,

single-processor computer systems that use an Intel® Pentium® II microprocessor with MMX™ technology. These Dell® systems incorporate an ISA expansion bus as well as a high-performance PCI local bus. These buses are built into the system board, which also integrates all other elements of the basic computer system.

The Dell Dimension XPS H233 and XPS H266 systems are available in either a desktop or a mini tower configuration. Both configurations use the same system board and base chassis. The only difference, other than physical mounting, is the number of externally-accessible 3.5-inch drive bays.

The Dell Dimension XPS H233 system operates at an internal frequency of 233 MHz and an external frequency of 66 MHz. The Dell Dimension XPS H266 system operates at an internal frequency of 266 MHz and an external frequency of 66 MHz. A single-edge contact (SEC) cartridge connected to the system board contains the system’s microprocessor and cache circuitry.

Main memory consists of two or four EDO SIMMs arranged in pairs. The base configuration for main memory is two 16-MB nonparity SIMMs. Main memory can be expanded up to 128 MB using 16- or 32-MB SIMMs.

The front of the computer has two 5.25-inch drive bays, one (desktop system) or two (mini tower system) 3.5-inch drive bay(s), plus a 3.5-inch diskette-drive bay . The 5.25-inch and 3.5-inch drive bays can hold diskette drives, tape drives, or CD-ROM drives.

System Overvi ew 1-1

ystem Features

In addition to the standard features found in a traditional PC, the Dell Dimension XPS H233 and XPS H266 systems include the following new and/or advanced features:

An Intel Pentium II microprocessor with MMX technology, specifically

•

designed to handle complex multimedia and communications software. Secondary cache of 512 KB of SRAM included within the SEC cartridge.

•

Main memory consisting of 32 to 128 MB of high-speed EDO SIMMs.

•

Error correction code (ECC) support built into the system board that co r r e c ts

•

single-bit errors and detects all multiple-bit errors when parity SIMMs are installed.

Three 32-bit PCI expansion-card slots and two 16-bit ISA expansion-card

•

slots. One shared expansion-card slot can accept either a PCI or an ISA expansion card.

Support for SCSI hard-disk drives and CD-ROM drives when a SCSI

•

controller card is installed in an expansion-card slot. A high-speed, high-resolution PCI video controller card installed in an

•

expansion-card slot, rather than an integrated video controller, to provide video flexibility for customers.

A 16-bit integrated audio controller that provides sound functions com-

•

patible with a Sound Blaster Pro expansion card. A MIDI/game port for connecting a MIDI device, joystick, game pad, or

•

other game input device. An integrated high-performance serial port and a bidirectional parallel port.

•

Two USB connectors, which can simplify connecting peripheral devices.

•

Most of these features are briefly described in this chapter. For a complete list of system features, see “Technical Specifications” found later in this chapter.

When following the procedures in this manual, assume that the locations or directions relative to the computer are as shown in Figure 1-1.

NOTE: Some service procedur es r ecommend laying the mini tower computer on its right side to improve service access, but the descriptions in this manual continue to use the directions shown in Figure 1-1 for the mini tower computer.

1-2 Dell Dimension XPS H233 and XPS H266 Systems Service Manual

back

left side right side

front

Mini Tower Computer

left side right

front

Desktop Computer

Figure 1-1. Computer Orientation

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

CAUTION: Ensure that all expansion-card slots have either a cardmounting bracket or a metal filler bracket installed. Ensure that the unoccupied drive bays have a front-panel insert installed. Omitting these inserts or brackets can disturb the normal airflow in the computer, resulting in possible damage to system components.

System Overvi ew 1-3

microprocessor fan

power supply

system board

expansion-card slots

card guide assembly and primary hard-disk drive

secondary hard-disk drive bracket

drive cage

drive bays (typical)

3.5-inch diskette drive

power button

hard-disk drive access indicator

reset button

front bezel

Figure 1-2. Desktop Computer Featur es

1-4 Dell Dimension XPS H233 and XPS H266 Systems Service Manual

microprocessor fan

power supply

system board

expansion-card slots

card guide assembly and primary hard-disk drive

secondary hard-disk drive bracket

drive cage

drive bays (typical)

3.5-inch diskette drive

power button

hard-disk drive access indicator

reset button

front bezel

Figure 1-3. Mini Tower Computer Features

System Overvi ew 1-5

voltage selection switch

security cable ring

parallel port connector

MIDI/game port connector

video connector

AC power receptacle

mouse connector

keyboard connector

serial port connector

USB connectors (2)

line-out connector

microphone connector

line-in connector

Figure 1-4. Back-Panel Features (Typical)

Advanced Expansion Subsystem

This computer system offers an advanced expansion subsystem that can support a mixture of traditional ISA expansion cards (called legacy expansion cards), Plug and Play ISA expansion cards, and PCI expansion cards. Either the operating system or the ISA Configuration Utility (ICU) provides the means to configure the various types of expansion cards and to avoid resource conflicts that might arise.

NOTES: The ICU is required only when the system runs a non-Plug-and-Play operating system (such as Microsoft® Windows NT® 4.0 and earlier) and includes legacy ISA expansion cards. With the Microsoft Windows® 95 operating system, the functions provided by the ICU are handled by the Device Manager, which can be accessed by double-clicking the System icon in the Control Panel. Windows 95 documentation provides instructions on using the Device Manager to manage resources and resolve conflicts.

Because Dell ships only Plug and Play and PCI expansion cards on Dell Dimension systems that have a non-Plug-and-Play operating system, the ICU is not provided with systems. This utility can be downloaded from Dell’s online services.

After all legacy expansion cards have been configured by the operating system or with the ICU, the system automatically assigns any required memory space, IRQ lines, and DREQ lines to any installed Plug and Play and PCI expansion cards the next time the system is booted.

1-6 Dell Dimension XPS H233 and XPS H266 Systems Service Manual

Chapter 2, “Using Configuration Software,” in the Reference Guide and the “Configuring Expansion Cards” section in the online System User’s Guide (located in the Dell Accessories folder) provide instructions for using the ICU to configure legacy ISA expansion cards.

The expansion-card slots include three ISA expansion-card connectors and four PCI expansion-card connectors. One PCI expansion-card connector and one ISA expansion-card connector share a single expansion-card slot, so a maximum of six expansion cards can be installed.

EIDE Subsystem

The EIDE subsystem includes two EIDE interfaces (primary and secondary), each of which can support up to two EIDE devices such as high-capacity EIDE hard-disk drives, CD-ROM drives, and tape drives.

When two EIDE drives are connected to a single EIDE interface cable, a master/slave relationship must be defined between the two drives so that they will operate correctly while cabled together. Assigning the master and slave designations usually involves resetting jumpers on the circuit card on the underside of each drive. The master/slave relationship is defined in different ways for different types of drives. For details about a specific drive, refer to the documentation included with the drive. When you replace a drive, look at the jumpers on the removed drive to set the jumpers on the replacement drive.

NOTE: The externally accessible drive bays at the front of the computer are normally used for diskette drives, CD-ROM drives, or tape drives. The harddisk drives should be installed in the internal drive bays as described in the following subsection. For detailed information about the data storage subsystem, see “Installing Drives” in the online System User’s Guide, which is located in the Dell Accessories folder.

Hard-Disk Drive Options

A 1-inch-high EIDE or SCSI hard-disk drive is installed in the primary harddisk drive bay in the card guide assembly at the front of the chassis. An optional 1-inch-high EIDE or SCSI hard-disk drive can be installed in the secondary hard-disk drive bay located near the 3.5-inch diskette drive. SCSI hard-disk drives require a SCSI controller card installed in an expansion-card slot.

System Overvi ew 1-7

omputer Service

The following subsections provide service-related information about the computer.

Power Supply

The 200-W power supply can operate from an AC power source of 115 VAC at 60 Hz or 230 VAC at 50 Hz. The 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. The DC power cable connectors must be connected to their corresponding power input connectors on the system board or drives in order to measure these voltages.

Table 1-1. DC Voltage Ranges

Maximum

Voltage Range

Output Current

+3.3 VDC +3.14 to +3.47 VDC +5 VDC +4.90 to +5.25 VDC

14.00 A

22.00 A

–5 VDC –4.50 to –5.50 VDC 0.300 A +12 VDC +11.40 to +12.60 VDC

6.00 A

–12 VDC –10.80 to –13.20 VDC 0.300 A +5 VSB

The combined load on the +3.3 VDC and +5 VDC outputs cannot exceed 140 W. The +12-VDC output line can withstand surges of up to 11.0 A to support disk start-up

operations. The +5 VSB (volts standby) is sometimes called “flea power.”

+4.75 to +5.25 VDC 0.010 A

1-8 Dell Dimension XPS H233 and XPS H266 Systems Service Manual

DC Power Distribution

Figures 1-5 through 1-9 provide the following information about DC power distribution:

Power-supply cable identification

•

Typical DC power connections for diskette, tape, CD-ROM, and hard-disk

•

drives Power distribution to sockets and connectors on the system board

•

Pin assignments of DC power connectors

•

Figure 1-5. DC Power Cables

System Overvi ew 1-9

power

supply

J9D1

J7J2

J7J1

J6J2

3.3 VDC GND

PWRGOOD +12 VDC +5 VDC –5 VDC +5 VDC GND +5 VSB

PSON#

power switch

POWER

PSON# GND

+5 VDC GND

GND

+5 VSB

GND +5 VDC –5 VDC

–12 VDC +12 VDC

J7M1

battery

5.25-inch drive

3.5-inch drives (second drive uses Y-cable)

3.5-inch

diskette drive

primary

hard-disk drive

secondary hard-disk drive (uses Y-cable)

RTC

ISA connectors

PCI connectors

J6J1

2.1–2.8 V converter

CPU/system logic

+5 VDC GND

1.5-V

converter

+2.1–2.8 VDC +1.5 VDC GND

system board

fuse

Figure 1-6. DC Power Distribution

1-10 Dell Dimension XPS H233 and XPS H266 Systems Service Manual

GND +5 VDC GND +5 VDC

GND +5 VDC USB

GND +12 VDC

KEYBRD

MOUSE

J8L1

DC Power Connector Pin Assignments

The power-supply output voltages can be measured at the back (wire side) of the DC power connectors without disconnecting them. Figures 1-7 through 1-9 show the wire side of the connectors.

–5 VDC (white)

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

PSON#

(brown)

12 13 14 15 16 17 18 19 20

+5 VDC (red)

not connected

+5 VDC (red)

2 345678910

+5 VDC (red)

common (black)

+5 VDC (red)

common (black)

PWRGOOD

(gray)

common (black) common (black)

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

1 Pin 5 — PWRGOOD is a status signal generated by the power supply to notify the system

that the DC operating voltages are within the ranges required for proper system operation.

2 Pin 11 — PSON# is activated by pressing and releasing the power button while the power

supply is in its standby state. This act ion connects the power supply’s PSON# input to ground, thereby switching the power supply to its full-on condition.

Figure 1-7. DC Power Connector P1

System Overvi ew 1-11

P2, P3, P5, P6

1234

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

1234

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

Figure 1-8. DC Power Connectors P2, P3, P4, P5, and P6

456

321

+3.3 VDC (orange)common (black) +3.3 VDC (orange)common (black)

common (black) +3.3 VDC (orange)

Figure 1-9. DC Power Connector P7

1-12 Dell Dimension XPS H233 and XPS H266 Systems Service Manual

System Board

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

mouse connector (MOUSE)

keyboard connector (KEYBRD)

USB connectors (USB)

serial port connector (SER1)

parallel port connector (PARALLEL)

integrated audio controller jacks (LINE OUT, LINE IN, and MIC IN)

MIDI/game port (GAME/AUDIO)

CD-ROM drive audio cable connector (CDROM)

PCI expansion-card connectors (PCI1, PCI2, PCI3, and PC I4)

ISA expansion-card connectors (ISA1, ISA2, and ISA3)

SEC cartridge connector (SLOT 1)

power input connector (POWER)

SIMM sockets (J6J1, J6J2, J7J1, and J7J2)

3.3-V power input connector (J7M1)

battery socket (BT9M1)

microprocessor fan connector (J8L1)

primary EIDE channel connector (PRI IDE)

diskette-drive interface connector (FLOPPY)

secondary EIDE channel connector (SEC IDE)

control panel connector (J9D1)

SCSI hard-disk drive access indicator cable connector (J8D1)

system board jumpers

wave-table upgrade connectors (J7C1 and J7D1)

Figure 1-10. System Board Features

Main Memory

The four SIMM sockets can accommodate one or two pairs of EDO SIMMs. The base configuration for main memory is one pair of 16-MB nonparity SIMMs installed in sockets J6J1 and J6J2. Main memory can be expanded using pairs of 16- or 32-MB SIMMs. The SIMMs within each pair (J6J1 and J6J2 or J7J1 and J7J2) must be the same capacity and parity type, but the two pairs need not match each other.

The system’s EC C support, which is built int o the system board, corrects singl ebit errors and detects all multiple-bit errors. To use the ECC support, all installed SIMMs must be parity SIMMs.

System Overvi ew 1-13

System Board Jumpers

See Figure 1-11 and Table 1-2 for jumper settings and descriptions.

Figure 1-11. System Board Jumpers

1-14 Dell Dimension XPS H233 and XPS H266 Systems Service Manual

Table 1-2. System-B oard Jumper Desc riptions

Jumper Settings Description

A, pins 1-3; B, pins 1-6; C, pins 1-3 (microprocessor speed)

4 6

1 3

4 6 4 6

1 3

4 6

1 3

4 6

1 3

4 6

1 3

A, pins 4-6 (reserved)

4 6

1 3

C, pins 4-6 (clear CMOS)

4 6

1 3

4 6

1 3

The microprocessor’s internal speed is

233 MHz.

The microprocessor’s internal speed is 266 MHz.

Reserved (do not change).

System setup settings are retained when the system boots (default setting).

System setup settings revert to their defaults when the system boots. (Set to pins 4-5 and boot the system to clear NVRAM. Reset to pins 5-6 to restore default CMOS settings at system start-up.)

D, pins 1-3 (password)

4 6

1 3

4 6

1 3

D, pins 4-6 (setup)

4 6

1 3

4 6

1 3

The system and setup password features are enabled (default setting).

The password features are disabled. (Set to pins 1-2, and then turn on the system to clear the password(s). Reset to pins 2-3 to enable password features.)

Set to pins 5-6 to allow use of the system setup program.

Set to pins 4-5 to prevent the loading of the system setup program.

System Overvi ew 1-15

nterrupt Assignments

Table 1-3. Interrupt Assignments

IRQ Line Used By/Available

IRQ0 Generated by system timer. IRQ1 Generated by I/O controller to indicate full keyboard output

buffer.

IRQ2 Generated internally by interrupt controller to enable IRQ8

through IRQ15. IRQ3 Available for use by an expansion card. IRQ4 Generated by I/O controller to indicate that the device connected

to the serial port requires service (COM1 or COM3). IRQ5 Default audio IRQ assignment. IRQ6 Generated by I/O controller to indicate that the diskette drive or

tape drive requires service. IRQ7 Generated by I/O controller to indicate that the device connected

to the parallel port requires service. IRQ8 Generated by I/O controller for each tick of the RTC. IRQ9 Available for use by an expansion card. IRQ10 Available for use by an expansion card. IRQ11 IRQ12 Generated by I/O controller to indicate full mouse output buffer. IRQ13 Generated by math coprocessor to indicate a coprocessor error. IRQ14 Generated by a device connected to the primary EIDE interface to

IRQ15 Generated by a device connected to the secondary EIDE interface

* The PCI IRQ line is assigned to an available IRQ line after all ISA expansion cards have

been configured. If an ISA expansion card is configured for IRQ11, the PCI IRQ is assigned to another available IRQ line.

Default PCI IRQ assignment.

indicate that the device requires service.

to indicate that the device requires service. If no device is con-

nected to the secondary EIDE interface, IRQ15 is available for

use by an expansion card.

1-16 Dell Dimension XPS H233 and XPS H266 Systems Service Manual

MA Channel Assignments

Table 1-4. DMA Channel Assignments

DREQ Line Used By/Available

DREQ0 Default audio DMA channel assignment DREQ1 Default audio DMA channel assignment DREQ2 Generated by I/O controller to enable DMA cycle for

attached diskette drive DREQ3 Available for use by an expansion card DREQ4 Reserved — selects second DMA controller DREQ5 Available for use by an expansion card DREQ6 Available for use by an expansion card DREQ7 Available for use by an expansion card

System Overvi ew 1-17

+ 62 hidden pages

Dell XPS H233, XPS H266 User Manual

Contents

System Overview

Advanced Expansion Subsystem

EIDE Subsystem

Hard-Disk Drive Options

Power Supply

DC Power Distribution

DC Power Connector Pin Assignments

System Board

Main Memory

System Board Jumpers