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Information in this document is subject to change without notice.© 1998 Dell Computer Corporation. All rights reserved.

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 Dell Dimension are registered trademarks of Dell Computer Corporation; Intel and Pentium are registered trademarks and Celeron and MMX are trademarks of Intel Corporation; Microsoft, Windows, and MS-DOS are registered trademarks of Microsoft Corporation; IBM is a registered trademark of International Business Machines Corporation; VESA is a registered trademark of Video Electronics Standards Association.

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.

August 1998 P/N 0682E

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System Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2Advanced Expansion Subsystem. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6EIDE Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6Hard-Disk Drive Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Computer Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

DC Power Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7DC Power Connector Pin Assignments . . . . . . . . . . . . . . . . . . . . . 1-10

System Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12Main Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13System Board Jumper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13

Interrupt Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15DMA Channel Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16Technical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17

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Initial User Contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1External Visual Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2Observing the Boot Routine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3Internal Visual Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4Eliminating Resource Conflicts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5Running the Dell Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6Getting Help. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

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Diagnostic Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1POST Beep Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3System Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

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Recommended Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1Precautionary Measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1Computer Cover and Support Beam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2Bezel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5Drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Removing and Replacing a Front-Panel Insert . . . . . . . . . . . . . . . . . . . . 4-6Removing a 3.5-Inch Insert . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6Drive Cage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-75.25-Inch Drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8Upper 3.5-Inch Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10Lower 3.5-Inch Drive (Mini Tower Computer Only). . . . . . . . . . . . . . . 4-113.5-Inch Diskette Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12Primary Hard-Disk Drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13Secondary Hard-Disk Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14

Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16Fan Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17Card Guide Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18Control Panel Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19System Board Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-20

Expansion Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21DIMMs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-22Microprocessor and Heat Sink Assembly . . . . . . . . . . . . . . . . . . . . . . 4-23Replacing the Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-25

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

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System Setup Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1Main Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2Advanced Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3

Peripheral Configuration Submenu . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5IDE Configuration Submenu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6Primary IDE Master Submenu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8Diskette Options Submenu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-9DMI Event Logging Submenu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-10Video Configuration Submenu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-11Resource Configuration Submenu. . . . . . . . . . . . . . . . . . . . . . . . . . . . A-12

Security Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-13Power Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-14Boot Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-16

Hard Drive Submenu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-18Removable Devices Submenu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-19

Exit Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-20

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)LJXUHV Figure 1-1. Computer Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3Figure 1-2. Internal View of Desktop Computer . . . . . . . . . . . . . . . . . . . . 1-4Figure 1-3. Internal View of Mini Tower Computer . . . . . . . . . . . . . . . . . . 1-5Figure 1-4. Back-Panel Features (Typical) . . . . . . . . . . . . . . . . . . . . . . . . . 1-5Figure 1-5. DC Power Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8Figure 1-6. DC Power Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9Figure 1-7. DC Power Connector P1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10Figure 1-8. DC Power Connectors P2, P3, P4, P5, and P6 . . . . . . . . . . . 1-11Figure 1-9. DC Power Connector P7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11Figure 1-10. System Board Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12Figure 1-11. System Board Jumper (J9D3) . . . . . . . . . . . . . . . . . . . . . . . . 1-13Figure 4-1. Computer Cover Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2Figure 4-2. Support Beam Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3Figure 4-3. Bezel Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5Figure 4-4. 3.5-Inch Insert Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6Figure 4-5. Drive Cage Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7Figure 4-6. 5.25-Inch Insert Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8Figure 4-7. 5.25-Inch Drive Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8Figure 4-8. Upper 3.5-Inch Drive Removal. . . . . . . . . . . . . . . . . . . . . . . . 4-10Figure 4-9. Lower 3.5-Inch Drive Removal (Mini Tower

Computer Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11Figure 4-10. 3.5-Inch Diskette Drive Removal . . . . . . . . . . . . . . . . . . . . . . 4-12Figure 4-11. Primary Hard-Disk Drive Removal . . . . . . . . . . . . . . . . . . . . . 4-13Figure 4-12. Secondary Hard-Disk Drive Assembly Removal . . . . . . . . . . 4-14Figure 4-13. Secondary Hard-Disk Drive Removal . . . . . . . . . . . . . . . . . . . 4-15Figure 4-14. Power Supply Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16Figure 4-15. Fan Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17Figure 4-16. Card-Guide Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . 4-18Figure 4-17. Control-Panel Board Removal . . . . . . . . . . . . . . . . . . . . . . . . 4-19Figure 4-18. System Board Components . . . . . . . . . . . . . . . . . . . . . . . . . 4-20Figure 4-19. Expansion Card Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21Figure 4-20. DIMM Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-22Figure 4-21. DIMM Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-22Figure 4-22. Microprocessor and Heat Sink Removal . . . . . . . . . . . . . . . . 4-23Figure 4-23. Battery Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-25Figure 4-24. System Board Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26Figure 4-25. Guide-Bracket Assembly Removal . . . . . . . . . . . . . . . . . . . . 4-27Figure 4-26. Mounting Screw and Bracket . . . . . . . . . . . . . . . . . . . . . . . . 4-28Figure 4-27. System Board Mountings . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-28Figure 4-28. Bracket Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-29

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Figure A-1. Main Screen Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2Figure A-2. Advanced Screen Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3Figure A-3. Peripheral Configuration Submenu . . . . . . . . . . . . . . . . . . . . . A-5Figure A-4. IDE Configuration Submenu . . . . . . . . . . . . . . . . . . . . . . . . . . A-6Figure A-5. Primary IDE Master Submenu. . . . . . . . . . . . . . . . . . . . . . . . . A-8Figure A-6. Diskette Options Submenu . . . . . . . . . . . . . . . . . . . . . . . . . . . A-9Figure A-7. DMI Event Logging Submenu . . . . . . . . . . . . . . . . . . . . . . . . A-10Figure A-8. Video Configuration Submenu. . . . . . . . . . . . . . . . . . . . . . . . A-11Figure A-9. Resource Configuration Submenu. . . . . . . . . . . . . . . . . . . . . A-12Figure A-10. Security Screen Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-13Figure A-11. Power Screen Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-14Figure A-12. Boot Screen Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-16Figure A-13. Hard Drive Submenu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-18Figure A-14. Removable Devices Submenu . . . . . . . . . . . . . . . . . . . . . . . A-19Figure A-15. Exit Screen Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-20

7DEOHV Table 1-1. DC Voltage Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7Table 1-2. System Board Jumper Descriptions . . . . . . . . . . . . . . . . . . . 1-14Table 1-3. Interrupt Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15Table 1-4. DMA Channel Assignments . . . . . . . . . . . . . . . . . . . . . . . . . 1-16Table 1-5. Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17Table 3-1. Diagnostic Indicator Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2Table 3-2. POST Beep Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4Table 3-3. System Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4Table A-1. Main Screen Menu Options . . . . . . . . . . . . . . . . . . . . . . . . . . A-2Table A-2. Advanced Screen Menu Options . . . . . . . . . . . . . . . . . . . . . . A-4Table A-3. Peripheral Configuration Submenu Options . . . . . . . . . . . . . . A-5Table A-4. IDE Configuration Submenu Options . . . . . . . . . . . . . . . . . . . A-7Table A-5. Primary IDE Master Submenu Options . . . . . . . . . . . . . . . . . A-8Table A-6. Diskette Options Submenu Options . . . . . . . . . . . . . . . . . . . . A-9Table A-7. DMI Event Logging Submenu Options . . . . . . . . . . . . . . . . . A-10Table A-8. Video Configuration Submenu Options . . . . . . . . . . . . . . . . . A-11Table A-9. Resource Configuration Submenu Options . . . . . . . . . . . . . . A-12Table A-10. Security Screen Menu Options . . . . . . . . . . . . . . . . . . . . . . . A-13Table A-11. Power Screen Menu Options . . . . . . . . . . . . . . . . . . . . . . . . A-14Table A-12. Boot Screen Menu Options . . . . . . . . . . . . . . . . . . . . . . . . . A-16Table A-13. Hard Drive Submenu Options . . . . . . . . . . . . . . . . . . . . . . . . A-18Table A-14. Removable Devices Submenu Option. . . . . . . . . . . . . . . . . . A-19Table A-15. Exit Screen Menu Options . . . . . . . . . . . . . . . . . . . . . . . . . . A-20

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5HDG�7KLV�)LUVWA prerequisite for using this manual to service Dell computer systems is a basicknowledge of IBM®-compatible PCs and prior training in IBM-compatible PCtroubleshooting techniques. In addition to information provided in this manualand the User’s Guide that came with the system, Dell provides the Diagnosticsand Troubleshooting Guide for troubleshooting procedures and instructions onusing the Dell Diagnostics to test the computer system.

:DUQLQJV��&DXWLRQV��DQG�1RWHVThroughout 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:

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The Dell Dimension® Vxxx and Vxxxc systems are high-speed computer sys-tems that use an Intel® Pentium® II microprocessor with MMX™ technology or a Celeron™ processor with MMX technology. These Dell® systems combine Peripheral Component Interconnect (PCI) design with an accelerated graphics port (AGP) and Industry Standard Architecture (ISA) design that allows a wide range of initial configurations and upgrade possibilities.

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

The front of the computer has two 5.25-inch drive bays and one 3.5-inch diskette-drive bay. In addition, the mini tower systems have two 3.5-inch drive bays and the desktop system has one 3.5-inch drive bay. The 5.25- and 3.5-inch drive bays can hold diskette drives, tape drives, or CD-ROM drives.

The microprocessors for each of these computers and their operating frequen-cies are as follows:

� Dell Dimension V333c systems — 333-megahertz (MHz) Celeron micropro-cessor with MMX technology that runs at an external speed of 66 MHz

� Dell Dimension V333 systems — 333-MHz Pentium II microprocessor with MMX technology that runs at an external speed of 66 MHz



NOTE: Not all processor speeds are available at all locations.

For Dell Dimension Vxxx systems, a single-edge contact (SEC) cartridge con-nected to the system board contains the system’s microprocessor and cache circuitry. For Dell Dimension Vxxxc systems, a single-edge processor package (SEPP) connected to the system board contains the system’s microprocessor and cache circuitry.

Main memory consists of up to three dual in-line memory modules (DIMMs). The base configuration for main memory is one 32-megabyte (MB) DIMM. Main memory can be expanded up to 384 MB by using 32-, 64-, or 128-MB DIMMs.

System Overview 1-1

1-2

6\VWHP�)HDWXUHVIn addition to the standard features found in a traditional personal computer, the Dell Dimension Vxxx and Vxxxc systems include the following:

� An Intel Pentium II microprocessor with MMX technology, that is specifi-cally designed to handle complex multimedia and communications software, or an Intel Celeron microprocessor with MMX technology.

� An L1 cache of 32 KB of static random-access memory (SRAM) residing in the processor core.

� For a Pentium II processor, an L2 cache of 512 KB of SRAM on a separate chip on the processor card. The L2 cache runs at half the processor’s inter-nal clock speed.

� For a Celeron processor, an L2 cache of 128 KB of SRAM residing in the processor core. The L2 cache runs at full processor clock speed.

� Main memory consisting of 32 to 384 MB of synchronous dynamic RAM (SDRAM) DIMMs.

� Two full-length 32-bit PCI expansion slots for connecting high-speed PCI peripherals to the PCI bus—greatly increasing their input/output (I/O) speeds over the speeds attainable using the ISA bus.

� One full-length 16-bit ISA expansion slot.

� One shared full-length PCI expansion slot containing both a PCI and an ISA expansion-card connector, only one of which can be used at any given time.

� Both PCI and ISA Plug and Play support.

� An integrated diskette drive interface that supports a single diskette drive without the need for a controller card.

� Two enhanced integrated drive electronics (EIDE) interfaces on the PCI bus support up to two EIDE devices each. Supported devices include Advanced Technology Attachment (ATA)-33 Ultra direct memory access (DMA) hard-disk drives, CD-ROM drives, and tape drives.

� Onboard ATI Rage Pro (2X) AGP video controller with 8 MB of video SDRAM. The 133-MHz AGP video controller uses its own dedicated graph-ics bus and significantly enhances 3D graphics. A video feature connector for graphics attachments is also on the system board.

� An integrated high-performance serial port and a bidirectional parallel port.

� Two USB connectors, which can simplify connecting peripheral devices.

� A PS/2-style keyboard port and a PS/2-compatible mouse port.

� Dell Dimension Vxxx and Vxxxc systems are available with either an on-board network interface controller (NIC) or an onboard audio controller.

For systems with onboard network capabilities, a 10/100-megabit-per-second (Mbps) Intel PRO 10/100 82558 NIC provides all the functions of a separate network card and supports both the 10BASE-T and 100BASE-TX Ethernet standards.

Dell Dimension Vxxx and Vxxxc Systems Service Manual

For systems with onboard audio, a PCI/ISA Yamaha YMF724 DS-1 AC97-compliant advanced audio controller with 3D positioning and DirectSound acceleration provides audio functions compatible with a Sound Blaster Pro expansion card. A musical instrument digital interface (MIDI)/game port provides a connection for a joystick, MIDI keypad, game pad, or other game input device.

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 procedures recommend 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.

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left side right side

front

back

left side right side

back

Mini Tower Computer

front

Desktop Computer

System Overview 1-3

1-4

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chassis cooling fan

system board

chassis

card-guide assembly(contains primary hard-disk drive)

filler brackets

drive cage

diskette-drive interface cable

DC power cables

power supply

drive bays (typical)

bezel

power button

hard-disk drive access indicator

reset button

secondary hard-disk drive bracket

power indicator


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chassis cooling fan

system board

chassis

card guide assembly(contains primary hard-disk drive)

filler brackets

drive cage

diskette-drive interface cable

DC power cables

power supply

drive bays (typical)

bezel

power button

hard-disk drive access indicator

reset button


video connector

parallel port connector

mouseconnector

keyboard connector

serial port connector

MIDI/game port connector*

USB connectors (2)line-out jack*line-in jack*

microphone jack*

voltage selectionswitch

AC power receptacle

* Present only on systems with integrated sound.

NIC connector

security cable ring

System Overview 1-5

1-6

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This computer system offers an advanced expansion subsystem that can sup-port a mixture of traditional ISA expansion cards (called legacy expansion cards), Plug and Play ISA expansion cards, and PCI expansion cards. Using the operating system, you can configure the various types of expansion cards and identify resource conflicts that might arise.

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

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

All EIDE devices should be configured for the Cable Select jumper position, which assigns master and slave status to devices by their position on the inter-face cable. In this configuration, the drive attached to the last connector on the interface cable is the master or boot drive (drive 0) and the drive attached to the middle connector on the interface cable is the slave drive (drive 1). Refer to the drive’s documentation for instructions on setting the Cable Select jumper position.

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 hard-disk drives should be installed in the internal drive bays as described in the following subsection. For detailed information about the data storage sub-system, see Chapter 3, “Installing Drives,” in the Dell Dimension Vxxx and Vxxxc Reference and Troubleshooting Guide.

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A 1-inch-high EIDE hard-disk drive is installed in the primary hard-disk drive bay in the card-guide assembly at the front of the chassis. An optional 1-inch-high EIDE hard-disk drive can be installed in the secondary hard-disk drive bay located near the 3.5-inch diskette drive.

&RPSXWHU�6HUYLFHThe following subsections provide service-related information about the computer.


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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 volt-ages 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 corre-sponding power input connectors on the system board or drives in order to measure these voltages.

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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

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+3.3 VDC +3.14 to +3.47 VDC 14.00 A1

+5 VDC +4.90 to +5.25 VDC 22.00 A1

–5 VDC –4.50 to –5.50 VDC 0.300 A

+12 VDC +11.40 to +12.60 VDC 6.00 A2

–12 VDC –10.80 to –13.20 VDC 0.300 A

+5 VSB3 +4.75 to +5.25 VDC 0.010 A1 The combined load on the +3.3-VDC and +5-VDC outputs cannot exceed 140 W.2 The +12-VDC output line can withstand surges of up to 11.0 A to support disk start-up

operations.3 The +5 VSB (volts standby) is sometimes called “flea power.”

System Overview 1-7

1-8

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P1

P7

P2

P3

P6

P5

P4


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+3.3 P2

secondary hard-disk drive (uses Y-cable)

+5 VDC

–12 VDC

GND

+12 VDC+3.3

+3.3

GND

GND

–5 VDC

–5 VDC

+5 VDC

+12 VDC

powersupply

PWRGOOD

P1

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

3.5-inch diskette drive

5.25-inchdrive

primary hard-disk drive

ISAconnectors

PCIconnectors

1.5-Vconverter

microprocessorSEPP/SEC cartridge connector (J4J1)

system board

P3

P5

P4

P6

+5 VSBPSON#

powerswitch

GNDPSON#

+5 VSB

battery RTC

GND

+12 VDC

GND

+2.1–2.8 VDC

GND

KEYBD

MSE

GND

GND

+5 VDC

+5 VDC

fuse

P7

POWER 3.3

FAN1

5.25-inchdrive

GND

+5 VDC

GND

GND

+5 VDC USB0, USB1

fuse

+3.3

GNDBANK 0

2.1–2.8-Vconverter

+1.5 VDC

DIMMs

BANK 1

BANK 2

System Overview 1-9

1-1

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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.

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 action connects the power supply’s PSON# input to ground, thereby switching the power supply to its full-on condition.

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11

1

PWRGOOD1 (gray)

–12 VDC (blue)

+12 VDC (yellow)

+5 VFP (purple)

common (black)

2 3 4 5 6 7 8 9 10

12 13 14 15 16 17 18 19 20

P1

+5 VDC (red)

+5 VDC (red)

+5 VDC (red)

+5 VDC (red)

+5 VDC (red)

+5 VDC (red)

common (black)

common (black)

common (black)

PSON# 2 (brown)

common (black)

common (black)

common (black)

–5 VDC (white)

not connected

0 Dell Dimension Vxxx and Vxxxc Systems Service Manual

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1 2 3 4+5 VDC (red)

common (black)

common (black)

+12 VDC (yellow)

P2, P3,P5, P6

1 2 3 4

+5 VDC (red)

common (black)

common (black)

+12 VDC (yellow)

P4

4 5 6

+3.3 VDC (orange)common (black)321

+3.3 VDC (orange)common (black)

common (black) +3.3 VDC (orange)

P7

System Overview 1-11

1-1

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

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parallel port connector (PARALLEL)

keyboard connector (KEYBD)

ISA expansion-card connectors (ISA1 and ISA2)

mouse connector (MSE)microprocessor SEPP/SEC cartridge connector (J4J1)

serial port connector (SER1)

PCI expansion-cardconnectors (PCI1, PCI2, and PCI3)

MIDI/game port connector (GAME)1

audio jacks (LINE OUT, LINE IN, and MIC IN)1

diskette-drive interface connector (FLOPPY)

secondary EIDE channel connector (SEC IDE)

DIMM sockets (BANK 0, BANK 1, BANK 2)

configuration jumper (J9D3)

fan connector (J8M1)

video featureconnector (J7GI)

3.3-V power input connector (3.3)

USB connectors (USB0, USB1)

power input connec-tor (POWER)

battery socket (BT9K1)

modem audio cable connector for using audio system as speakerphone (TELEPHONY)1

speaker (LS10E1)

1 For systems with onboard audio

CD-ROM drive audio cable connector (CD-ROM)1

primary EIDE channel connector (PRI IDE)

auxiliary line-in audio connector (AUX)1

network connector (NIC)2

2 For systems with onboard NIC

monitorconnector (VIDEO)

diagnostic codeindicators

control panelconnector (J9G2)

0 1 2


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Memory can be increased to a maximum of 384 MB by installing combinations of 3.3-V, 32-, 64-, and 128-MB non-ECC DIMMs in the three DIMM sockets on the system board. Only 100-MHz DIMMs are supported.

NOTE: The system is designed for peak performance with specific DIMMs that are validated through rigorous testing. The system may not recognize other SDRAM DIMMs and may fail power-on self-test (POST).

For more information about the memory configurations, see “Adding Mem-ory” in Chapter 2 of the Reference and Troubleshooting Guide.

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

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Jumper on pins 1-2 (Normal mode)

In Normal mode, system setup settings and installed password(s) are retained when the system starts up. Normal mode attempts automatic recovery if BIOS detects any main blocks corrupted.

Jumper on pins 2-3(Configuration mode)

Starting system with jumper set in Configura-tion mode automatically starts system setup program, adds the Maintenance option to left end of menu bar, and displays the Main-tenance screen, which is accessible only in this mode. The Maintenance screen pro-vides two categories: Processor Speed and Clear All Passwords.

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� Processor Speed — Options are 333 MHz, 350 MHz, and 400 MHz. The Processor Speed option is factory-set to work with the system and normally should not be changed.

NOTE: Before leaving the Maintenance screen, reset Processor Speed to match system’s processor speed.

� Clear All Passwords — Disables a for-gotten password so you can access the system and/or assign new password(s). For complete password disable proce-dure, see “Disabling a Forgotten Password” in Appendix B of the Refer-ence and Troubleshooting Guide.

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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.

IRQ31 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.



IRQ113 Default PCI IRQ assignment.

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 indicate that the device requires service.

IRQ15 Generated by a device connected to the secondary EIDE inter-face to indicate that the device requires service. If no device is connected to the secondary EIDE interface, IRQ15 is available for use by an expansion card.

1 IRQ3 is available provided that no other device in the computer (such as a modem) is using COM2 or COM4.

2 IRQ9 is available to PCI expansion cards only.3 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 as-signed to another available IRQ line.


1-1

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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 Generated by I/O controller to enable DMA cycle for the parallel port when in EPP mode

DREQ4 Reserved — selects second DMA controller

DREQ5 Available for use by an expansion card




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Microprocessor type:

Intel Celeron . . . . . . . . . . . . . . Intel Celeron microprocessor that runs at 333 MHz internally/66 MHz externally

Intel Pentium II. . . . . . . . . . . . .Pentium II processor that runs at 333 MHz internally/66 MHz exter-nally, or at 350 or 400 MHz inter-nally/100 MHz externally. A slower compatibility speed can be set through the system setup program.

L1 cache. . . . . . . . . . . . . . . . . . . . . 32 KB (16-KB data cache; 16-KB instruction cache)

L2 cache:

Intel Celeron . . . . . . . . . . . . . . 128-KB pipelined write-back SRAM internal to the processor core that runs at full processor internal clock speed

Intel Pentium II. . . . . . . . . . . . . 512-KB pipelined write-back SRAM on the SEC that runs at half the processor’s internal clock speed

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

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System chip set . . . . . . . . . . . . . . . Intel 440BX AGPset

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

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

DMA channels . . . . . . . . . . . . . . . . seven

Interrupt levels . . . . . . . . . . . . . . . . 15

System BIOS chip . . . . . . . . . . . . . 4 Mb (512 KB)

NOTE: The Glossary in the Online Guide defines abbreviations and acronyms.


1-1

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Bus types. . . . . . . . . . . . . . . . . . . . PCI (version 2.1), ISA, and AGP

Bus speed . . . . . . . . . . . . . . . . . . . AGP: 133 MHzPCI: 33 MHzISA: 8.33 MHz

PCI expansion-card connectors . . . three (one shares a card-slot open-ing with an ISA connector)

PCI expansion-card connector size . . . . . . . . . . . . . . . . 120 pins

PCI expansion-card connector data width (maximum). . . . . . . . . . 32 bits

ISA expansion-card connectors . . . two (one shares a card-slot open-ing with a PCI connector)

ISA expansion-card connector size . . . . . . . . . . . . . . . . 98 pins

ISA expansion-card connector data width (maximum). . . . . . . . . . 16 bits

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System clock . . . . . . . . . . . . . . . . . 100 or 66 MHz (matches external processor speed)

Diskette/communications ports . . . 48 MHz from the system clock

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Architecture . . . . . . . . . . . . . . . . . . non-ECC SDRAM modules

DIMM sockets . . . . . . . . . . . . . . . . three; gold contacts

DIMM capacities . . . . . . . . . . . . . . 32, 64, and 128 MB

Minimum RAM . . . . . . . . . . . . . . . 32 MB

Maximum RAM . . . . . . . . . . . . . . . 384 MB

Frequency . . . . . . . . . . . . . . . . . . . 100 MHz

Clock cycle . . . . . . . . . . . . . . . . . . . 10 ns (supports 4 clocks only)

CAS latency . . . . . . . . . . . . . . . . . . 3

SPD revision . . . . . . . . . . . . . . . . . 1.2

Buffering . . . . . . . . . . . . . . . . . . . . unbuffered

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Voltage . . . . . . . . . . . . . . . . . . . . . .3.3 V

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

BIOS address. . . . . . . . . . . . . . . . . F0000h

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Externally accessible:

Mini tower chassis . . . . . . . . . . two 5.25-inch baysthree 3.5-inch bays

Desktop chassis. . . . . . . . . . . . two 5.25-inch baystwo 3.5-inch bays

Internally accessible. . . . . . . . . . . . two bays for 1-inch-high EIDE hard-disk drives

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Externally accessible:

Serial (DTE) . . . . . . . . . . . . . . . one 9-pin connector; 16550C-compatible

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

Video . . . . . . . . . . . . . . . . . . . . one 15-hole connector

Audio1. . . . . . . . . . . . . . . . . . . . three miniature jacks for line in, line out, and microphone

NIC2 . . . . . . . . . . . . . . . . . . . . .RJ45 connector

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

PS/2-compatible mouse. . . . . . 6-pin mini-DIN connector

MIDI/game1 . . . . . . . . . . . . . . . one 15-hole connector

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

Internally accessible:

Primary EIDE channel . . . . . . . 40-pin connector on PCI local bus

Secondary EIDE channel . . . . .40-pin connector on PCI local bus

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

Video feature . . . . . . . . . . . . . . 26-pin connector1 Available in onboard audio systems only2 Available in onboard NIC systems only




1-2

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Video type . . . . . . . . . . . . . . . . . . . onboard ATI Rage Pro AGP 2X

Video memory . . . . . . . . . . . . . . . . 8 MB SDRAM

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

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

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

Hard-disk drive access indicator . . . . . . . . . . . . . . . . . . . . . green

Network indicators (optional) . . . . . green and yellow

Diagnostic code indicators. . . . . . . four yellow and green

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DC power supply:

Wattage . . . . . . . . . . . . . . . . . . 200 W

Heat dissipation . . . . . . . . . . . . 778 BTU (fully loaded system with-out monitor)

Voltage . . . . . . . . . . . . . . . . . . . 90 to 135 V at 60 Hz;180 to 265 V at 50 Hz;100 V at 50 to 60 Hz for Japanese systems

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

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Mini tower chassis:

Height . . . . . . . . . . . . . . . . . . . 43.69 cm (17.2 inches)

Width . . . . . . . . . . . . . . . . . . . . 20.32 cm (8 inches)

Depth . . . . . . . . . . . . . . . . . . . . 44.45 cm (17.5 inches)

Weight . . . . . . . . . . . . . . . . . . 11.3 to 13.6 kg (25.0 to 30.0 lb)

Desktop chassis:

Height . . . . . . . . . . . . . . . . . . . 16.00 cm (6.3 inches)

Width . . . . . . . . . . . . . . . . . . . . 42.42 cm (16.7 inches)

Depth . . . . . . . . . . . . . . . . . . . . 44.45 cm (17.5 inches)

Weight . . . . . . . . . . . . . . . . . . 11.3 to 13.6 kg (25.0 to 30.0 lb)




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Temperature:

Operating . . . . . . . . . . . . . . . . . 10° to 35°C3 (50° to 95°F)

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

Relative humidity . . . . . . . . . . . . . . 20% to 80% (noncondensing)

Maximum vibration:

Operating . . . . . . . . . . . . . . . . . 0.25 G at 3 to 200 Hz at 1/2 octave/min

Storage . . . . . . . . . . . . . . . . . . 0.5 G at 3 to 200 Hz at 1/2 octave/min

Maximum shock:

Operating . . . . . . . . . . . . . . . . . left side (for mini tower orientation) and bottom half-sine pulse with a change in velocity of 50.8 cm/sec (20 inches/sec)

Storage . . . . . . . . . . . . . . . . . . 23-G faired-square wave with a velocity change of 508 cm/sec (200 inches/sec)

Altitude:

Operating . . . . . . . . . . . . . . . . . –16 to 3048 m3 (–50 to 10,000 ft)

Storage . . . . . . . . . . . . . . . . . . –16 to 10,600 m (–50 to 35,000 ft)3 At 35°C (95°F), the maximum operating altitude is 914 m (3000 ft).




1-2

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This 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 diagnostics is pro-vided in “Running the Dell Diagnostics” at the end of this chapter. Dell recommends that you perform these procedures in the order they are pre-sented in this chapter.

,QLWLDO�8VHU�&RQWDFWWhen 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 troubleshoot-ing 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 con-dition permits.

See “Maintaining the System” in the Online Guide for information 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 typ-ing 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

2-2

([WHUQDO�9LVXDO�,QVSHFWLRQThe external visual inspection consists of a quick inspection of the exterior of the computer, 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 computer, the monitor, and all peripherals.

2. Verify that all power cables are properly connected to the computer, the monitor and peripherals, and their electrical outlets.

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

For a PS/2-compatible mouse, the keyboard and mouse interface cable connectors are identical except for their labels. Verify that the keyboard and mouse interface cable connectors are firmly attached to the proper connec-tors on the back of the computer. To identify the proper connectors, see Figure 1-4.

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

Each of the serial, parallel, and USB interface cable connectors must be firmly attached to an appropriate connector on the back of the computer 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. For systems with an onboard network interface controller (NIC), verify that both ends of the network cable are properly connected.

Press one end of the unshielded twisted pair (UTP) Ethernet cable into the NIC connector until the cable snaps securely into place. Connect the other end of the cable to an RJ45 jack wall plate or to an RJ45 port on a UTP con-centrator or hub, depending on your network configuration.

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

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

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

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

8. 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.


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

Does the inspection reveal any problems?

Yes. Refer to the appropriate procedure in Chapter 4, “Removing and Replacing Parts.”

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

2EVHUYLQJ�WKH�%RRW�5RXWLQHAfter you perform an external visual inspection as described in the previous procedure, you should boot the system and, while the boot routine is running, observe the system for any indications of problems.

NOTES: To prevent possible damage to the original diagnostics diskette, always use a backup copy of the diagnostics diskette when servicing a user’s computer. Dell recommends that users make copies of the Dell Diagnostics Diskette. For instructions, see “Before You Start Testing” in Chapter 7 of the Reference and Troubleshooting Guide.

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

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

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

2. Check the power supply fan.

Does the fan run normally?


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 10 seconds after the boot routine starts?


No. Troubleshoot the computer power supply. If the troubleshooting proce-dure indicates that the computer power supply is operational, troubleshoot the memory subsystem.


2-4

4. While the boot routine is running, observe the computer 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, trou-bleshoot the diskette drive or hard-disk drive subsystem, as appropriate.

� Diagnostic codes: If a malfunction is detected and the computer fails to boot, the diagnostic code indicators display a code that identifies the problem. If the computer displays a diagnostic code, refer to Table 3-1.

� Beep codes: A beep code is a series of beeps that indicates an error condition. If the computer emits a beep code, refer to Table 3-2.

� System error messages: These messages can indicate problems or provide status information. If a system error message is displayed, refer to Table 3-3.

5. Observe the monitor screen for the Diagnostics Menu.

Does the Diagnostics Menu appear?

Yes. See “Running the Dell 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 computer.

Does the Diagnostics Menu appear?

Yes. See “Running the Dell Diagnostics” found later in this chapter.

No. Remove the diagnostics diskette from the diskette drive; then proceed to the next section, “Internal Visual Inspection.”

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A simple visual inspection of a computer’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 system components.

To perform the internal visual inspection, follow these steps:

1. Turn off the computer, including any attached peripherals, and disconnect all the AC power cables from their electrical outlets.

Wear a wrist grounding strap, and clip it to an unpainted metal surface, such as the security cable ring on the back of the chassis. If a wrist


grounding strap is not available, touch an unpainted metal surface on the back of the computer to discharge any static charge from your body.

2. Remove the computer cover.

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

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

To reseat the microprocessor/heat sink assembly, remove it from its con-nector and reinstall it as described in “Microprocessor and 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.

To reseat an expansion card, remove it from its connector and reinstall it as described in “Expansion Cards” in Chapter 4.

4. Verify that the system board jumper is set correctly.

For information about this jumper, see “System Board Jumper” in Chapter 1.

5. Check all cable connectors inside the computer to verify that they are firmly attached to their appropriate connectors.

6. Reinstall the computer cover.

7. Reconnect the computer and any attached peripherals to their electrical outlets, and turn them on.

Does the problem appear to be resolved?

Yes. No further steps are necessary.

No. Proceed to the next sections, “Eliminating Resource Conflicts,” “Run-ning the Dell Diagnostics,” and “Getting Help.”

(OLPLQDWLQJ�5HVRXUFH�&RQIOLFWVDevices within or connected to the computer may require dedicated memory spaces, interrupt levels, or DMA channels, all of which must be allocated during installation of the devices. Because devices may be installed at different times, it is possible that the same resource is assigned to two or more devices.


2-6

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 using the Microsoft® Windows® 98 Device Manager, and reassign the resources as necessary. See “Advanced Expansion Sub-system” in Chapter 1 for information on the Device Manager. See “Interrupt Assignments” in Chapter 1 to help identify possible conflicts. Also review the documentation provided with any installed expansion cards and other devices for additional interrupt information for the specific devices.

Online troubleshooting tools (OTT), flowcharts, and procedures for diagnosing problems are available on the Dell World Wide Web site at http://www.dell.com.

5XQQLQJ�WKH�'HOO�'LDJQRVWLFVThe Dell Diagnostics (included with the computer) contain tests that aid in troubleshooting all major components of the computer system.

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

Starting the diagnostics causes the Dell logo to appear on the 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 main memory error is detected, a message appears on the screen telling you which DIMM has failed.

If no errors are found in main memory, the diagnostics loads and the Diagnos-tics Menu displays. 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 check of the system

� Run Specific Tests — Tests a particular area or subsystem

*HWWLQJ�+HOS�If none of the troubleshooting procedures in this chapter or the tests in the Dell Diagnostics reveal the source of the problem or lead to the proper trouble-shooting steps for determining the source of the problem, call Dell for technical assistance. For instructions, see Chapter 8, “Getting Help,” in the Reference and Troubleshooting Guide.


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This chapter describes diagnostic and beep codes and system error messages that can occur during system start-up or, in the case of some failures, during normal system operation. In some cases, the system may display error mes-sages and emit beep codes simultaneously or may display a diagnostic code and will not boot. In other cases, such as when a video problem occurs, the system may emit a beep code even though it cannot display an error message.

If a faulty system does not emit diagnostic or beep codes or display system error messages to indicate a failure, run the appropriate tests in the diskette-based diagnostics to help you isolate the source of the problem. For instruc-tions on starting and using the diskette-based diagnostics, see “Running the Dell Diagnostics” in Chapter 2.

'LDJQRVWLF�&RGHVYour system is equipped with four diagnostic code indicators, which are labeled “A,” “B,” “C,” and “D” on the back of the computer. Each of the four indicators can be yellow or green. When the computer is turned on or restarted and the system is functioning normally, the indicators flash during POST. After the system boots, the indicators remain green to signify normal system operation.

If a malfunction is detected and the computer fails to boot, the indicators dis-play a code that identifies the problem. In this situation, write down the diagnostic code displayed and look it up in Table 3-1.

Diagnostic Codes, Beep Codes, and Error Messages 3-1

3-2

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The system board is receiving power, but the BIOS is not executing.

Check for correct processor speed setting in Maintenance mode. Reseat microproces-sor. Remove expansion cards and reboot. Replace system board.

Recovery mode from BIOS failure.

Check the configuration jumper setting. Use BIOS fail-ure recovery diskette.

The microprocessor has failed a BIOS test.

Reseat microprocessor. Replace the microprocessor.

Memory failed to be sized or enabled.

Reseat DIMMs individually. Replace faulty DIMMs.

A PCI bus failure has occurred.

Reseat the PCI cards. If the problem persists, remove all but one card, and then reboot. If the system boots, add another card and reboot. Repeat this step until the mal-functioning card is identified.

The video controller failed to initialize or respond.

Remove expansion cards and reboot. If the problem per-sists, remove all but one card, and then reboot. If the system boots, add another card and reboot. Repeat this step until the malfunctioning card is identified. Replace system board.

An IDE bus failure has occurred.

Reseat the EIDE cables. Remove hard-disk drive cables and boot to a bootable dis-kette. Replace hard-disk drive if system boots.


A B C D

A B C D

A B C D

A B C D

A B C D

A B C D

A B C D

= yellow

= green


3267�%HHS�&RGHVIf the monitor cannot display error messages during the POST, the computer may emit a series of beeps that identifies the problem or that can help identify a faulty component or assembly. Table 3-2 lists the beep codes that may be generated during POST.

When the system emits a beep code, record the code and then find it in Table 3-2. If Table 3-2 does not lead to the source of the problem, run the appropriate tests in the diskette-based diagnostics to assist in troubleshooting the problem.

The USB port or a device connected to it has failed initialization.

Disconnect the device from the USB port. Remove PCI cards and reboot. Reseat the PCI cards. If the problem per-sists, remove all but one card, and then reboot. If the system boots, add another card and reboot. Repeat this step until the malfunctioning card is identified.

Other failure. Use the No POST/No Video Online Troubleshooting Tool (OTT) at http://sup-port.dell.com/support/tshoot.asp.

System has booted and turned over con-trol to the operating system.

No action is necessary.

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= green

A B C D

A B C D

A B C D


3-4

6\VWHP�0HVVDJHVTable 3-3 lists (in alphabetical order) system messages that may appear on the screen during the boot routine or during normal system operation. These mes-sages can help you find the source of a problem or lead you to a possible solution.

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1-2 Video error Monitor not connected or defective onboard video controller.

1-2-2-3 BIOS ROM checksum error Faulty BIOS or defective system board.

1-3-1-1 DRAM refresh error Faulty or improperly seated DIMM or defective system board.

1-3-1-3 8742 keyboard controller error

Faulty keyboard controller (defective system board).

1-3-3-1 Memory defective or not present

No memory installed or faulty or improperly seated DIMM.

1-3-4-1

1-3-4-3

1-4-1-1

RAM failure on line xxx

RAM failure on data bits xxx of low byte on memory bus

RAM failure on data bits xxx of high byte on memory bus

Faulty or improperly seated DIMM.

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nnnn Cache RAM Passed

nnnn KB of system cache RAM success-fully tested.

No action necessary.

nnnn Extended RAM Passed

nnnn KB of system RAM successfully tested.


nnnn Shadow RAM Passed

nnnn KB of shadow RAM successfully tested.


nnnn System RAM Passed

nnnn KB of system RAM successfully tested.



CD ROM drive Identified

System’s automatic drive-type detection feature identified CD-ROM drive.


Diskette drive A error

Drive A present but failed BIOS POST.

Ensure that drive is installed correctly and defined correctly in system setup program.

Entering Setup System is starting sys-tem setup program.


Extended RAM Failed at off-set: nnnn

Extended memory not working correctly or not configured correctly at offset nnnn.

Enter system setup program and restore original value(s).

Failing Bits: nnnn

nnnn is a map of the bits at the RAM address (in system, extended, or shadow memory) that failed memory test. Each “1” in the map indicates a failed bit.


Fixed Disk n Failure

Fixed Disk Con-troller Failure

Hard-disk drive speci-fied by n not working or not configured correctly.

Ensure that drive is installed correctly and defined correctly in system setup program.

Fixed Disk n Identified

System’s automatic drive-type detection fea-ture identified hard-disk drive(s).


Incorrect Drive x type - Run SETUP

Diskette drive x not cor-rectly identified in system setup program.

Ensure that drive is defined correctly in system setup program.

Invalid NVRAM media type

System having a prob-lem accessing NVRAM (CMOS).

Set system configura-tion jumper to Maintenance mode; reboot system to clear all settings to their defaults.

Invalid system configuration data

System configuration information in system setup program is incor-rect, or battery charge may be low.

Enter system setup program, and verify system configuration information; reboot computer.

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3-6

Keyboard control-ler error

Keyboard controller failed its test.

Enter system setup program and restore original value(s); replace keyboard or system board.

Keyboard error Keyboard not working correctly.

Replace keyboard or system board.

Keyboard error nn BIOS detected a stuck key represented by scan code nn.

Check keyboard; if a key is stuck, pry it up.

Mouse initialized System’s mouse found and initialized.


Operating system not found

Operating system can-not be located on drive A or C.

In system setup pro-gram, confirm that drive A or C is properly identified.

Parity check 1 nnnn

Parity error detected on system bus. BIOS attempts to locate address and display it (nnnn); if BIOS cannot locate the address, it displays ???? instead.


Parity check 2 nnnn

Parity error detected on I/O bus. BIOS attempts to locate address and display it (nnnn); if BIOS cannot locate address, it displays ???? instead.


Press <F1> to resume, <F2> to enter Setup

Message displayed after any recoverable error message.

Press <F1> to start boot routine or <F2> to enter system setup program and change any settings.

Press <Del> to enter Setup

Optional message dis-played during POST.

Press <Del> to enter system setup program.

Previous boot incomplete - Default configuration used

After unsuccessful boot, POST loads default values and offers to run system setup program. (POST does not input default values to system setup program.)

Run system setup program and restore original value(s). If message reappears, set system configura-tion jumper to Maintenance mode; boot system to clear all system setup value(s) to their defaults.




Real-time clock error

Real-time clock failed BIOS test.


Resource alloca-tion conflict on motherboard

System cannot config-ure all system board devices without a resource conflict.

Run system setup pro-gram and resolve any obvious resource con-flicts; set system configuration jumper to Maintenance mode and start up system to return all system setup settings to defaults.

Shadow RAM failed at offset: nnnn

Shadow RAM failed at offset nnnn in 64-KB block in which error was detected.


System battery is dead - Replace and run Setup

CMOS clock battery indicator shows battery as dead.

Replace battery; run system setup program to reconfigure system.

System BIOS shadowed

System BIOS has been copied to shadow RAM.


System cache error - cache disabled

RAM cache failed BIOS test; BIOS has disabled cache.


System CMOS checksum bad - run Setup

System CMOS cor-rupted or modified incorrectly, perhaps by an application program that changes data stored in CMOS.

Run system setup pro-gram; reconfigure system, either by reverting to default values or by making your own selections.

System RAM failed at offset: nnnn

System RAM failed at offset nnnn in the 64-KB block in which error was detected.


System timer error

Timer test failed. Enter system setup program and restore original value(s).

UMB upper limit segment address: nnnn

Displays address nnnn of the upper UMB limit, indicating released seg-ments of BIOS that may be reclaimed by virtual memory manager.


Video BIOS shadowed

Video BIOS has been successfully copied to shadow RAM.





3-8

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This chapter provides procedures for removing and replacing components, assemblies, and subassemblies of the computer. Unless otherwise noted, each procedure assumes the following:

� The computer cover and support beam have already been removed.

� A part can be replaced by performing the removal procedure in reverse order.

� The procedures in this chapter apply to both desktop and mini tower configurations.

5HFRPPHQGHG�7RROVMost 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

� #1 and #2 Phillips-head screwdrivers

� 1/4-inch nutdriver

� Tweezers or long-nose pliers

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

3UHFDXWLRQDU\�0HDVXUHV�Before performing any of the procedures in this chapter, read the following warning.

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1. Turn off the computer and any attached peripherals.

2. Disconnect the computer and any attached peripherals from their

power sources to reduce the potential for personal injury.

Removing and Replacing Parts 4-1

4-2

3. Disconnect any telephone or telecommunications lines from the

computer.

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NOTE: This system uses two types of chassis. One chassis uses a cover with a built-in support beam. In the other chassis, the support beam is attached to the chassis and must be removed to access internal components.

To remove the computer cover and support beam from a desktop or mini tower system, follow these steps:

1. Observe the “Warning for Your Personal Safety and Protection of Your Equip-ment” found earlier in this chapter. Also, observe the safety instructions at the front of this guide.

2. If you are working on a mini tower system, lay the computer on its right side with the chassis foot off the edge of the work surface to allow the computer to lay flat.

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3. Loosen the cover-mounting thumbscrew shown in Figure 4-1 that secures the cover to the back of the computer.

NOTE: The thumbscrew is captive and stays in the cover when loosened.

cover-mounting thumbscrewcover release latches (2)

chassis foot


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4. Face the front of the chassis. Use your thumbs to press in both cover release latches while pushing the cover backward. Move the cover back about an inch, and then lift it straight up off the chassis.

If necessary, use both hands and work one side at a time.

5. If your chassis has a support beam attached to it (see Figure 4-2), pull up the front end of the beam until it snaps free from its fastener. Lift the front of the beam until the hinged tabs on the back end of the beam clear their slots.

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Replace the computer cover and support beam on a desktop or mini tower chassis as follows:

1. Check all cable connections, especially those that might have come loose during your work. Fold cables and unused connectors out of the way so that they do not catch on the computer cover or interfere with airflow inside the computer.

2. Check to see that no tools or extra parts (including screws) are left inside the computer.

3. If you removed the support beam from the chassis, slip the beam’s hinged tabs into their slots (see Figure 4-2) and lower the beam. Then place the

support beam front of computer

hinged tabs (2)

slots (2)

fastener

lock tab


4-4

lock tab into its fastener, and press down on the front end of the beam until it snaps into position.

4. Position the cover on the chassis approximately one inch back. Slide the cover forward until it locks into place.

5. Tighten the cover-mounting thumbscrew on the back of the chassis.


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To remove the bezel, follow these steps:

1. With the cover removed, press in the tabs along the top and side of the bezel (see Figure 4-3).

2. Swing the bezel away from the chassis, disengage the hooks, and carefully pull the bezel away from the chassis.

tabs (3)bezel

bezel

tabs (3)


4-6

'ULYHVThe following subsections explain how to remove the front-panel inserts, the drive cage, and the various types of drives in the drive bays. For additional information about drive installation and configuration, see Chapter 3, “Install-ing Drives,” in the Reference and Troubleshooting Guide.

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Empty drive bays in the drive cage are covered by a front-panel insert. The inserts for the 3.5-inch drives are mounted to the inside of the bezel. The insert for the lower 5.25-inch bay is mounted to the drive cage, and instructions for its removal are provided later in this chapter in the procedure for removing the 5.25-inch drives.

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After you have removed the computer cover, support beam, and the bezel, remove the front-panel insert for the bay you plan to use. From the back of the bezel, as shown for the mini tower chassis in Figure 4-4, press the release tab to the side, rotate the insert toward you, and remove it from the bezel. For mini tower computers, you must remove the upper insert to remove the lower insert.

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release tab

tabs (2)


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NOTE: The drive cage is the same in both the desktop and mini tower comput-ers. The drive cage in the mini tower computer is mounted 90 degrees clockwise from the one shown in Figure 4-5. This rotation positions the drives horizontally when the computer is set up.

To remove or install a drive in the drive cage, first remove the drive cage from the chassis as follows:

1. Remove the cover, support beam, and bezel.

2. Note the location and orientation of all cables attached to drives installed in the drive cage. Then disconnect the cables.

3. Remove the screw that secures the drive cage to the chassis.

4. Slide the drive cage forward approximately one-half inch. Then lift it up (to the side for the desktop) and away from the chassis.

The side of the chassis contains three detents that secure the drive cage to the side of the chassis. The drive cage may be slightly difficult to slide for-ward until it detaches from these detents.

screw

drive cage

drive cage slots (6)

tabs (6)


4-8

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To remove a 5.25-inch drive, follow these steps:

1. Remove the bezel.

2. Remove the drive cage and drives as an assembly.

3. If you are installing a drive in the lower 5.25-inch bay, remove the front-panel insert shown in Figure 4-6 by pressing in the two tabs on the right side and rotating the insert toward you until the retaining hook disengages from the drive cage.

If you later permanently remove the drive, reinstall the insert by fitting the hook into the slot on the left side of the drive cage, rotating the insert into place, and snapping the tabs on the right side of the insert into the slots in the drive cage.

4. Remove the three drive-mounting screws, and slide the drive out of the bay as shown in Figure 4-7.

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front-panel insert

tabs (2)

retaining hook

drive-mounting screws (3)


When you replace a drive, be sure to set the jumpers on the replacement drive the same as the jumpers on the drive you removed. For additional information about jumper settings on EIDE drives, see “EIDE Subsystem” in Chapter 1.


4-1

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To remove an upper 3.5-inch drive, follow these steps:



3. Remove the plastic insert from the bezel.

4. Remove the 6/32 x 1/4-inch screw securing the drive bracket to the drive cage, and then remove the bracket as shown in Figure 4-8.

NOTES: The three screws used to secure the drive to the bracket and to the left side of the drive cage have 3-mm threads. Be sure to use the cor-rect 3 x 5-mm screws when you secure the drive to the bracket and the drive to the cage.

Also note which screw was used to secure the drive bracket to the drive cage in step 4, and use the same 6/32 x 1/4-inch screw when reinstalling the bracket with its attached drive.


drive bracket

screws fordrive assembly (3)

drive-bracketmounting screw


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The lower 3.5-inch drive attaches to the left side and bottom of the drive cage. To remove a drive from the lower 3.5-inch drive bay in the mini tower com-puter, follow these steps:



3. Remove the three drive-mounting screws, one from the bottom and two from the left side (see Figure 4-9). Then slide the drive out of the drive cage.


In the bottom of the bay, there are two small grooves that the bottom drive must engage to slide back into the bay.

drive-mounting screws (3)


4-1

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


2. Disconnect the DC power and interface cables from the back of the 3.5-inch diskette drive.

3. Press the two drive-release tabs, and slide the drive out of the bay (see Figure 4-10).

Transfer the drive-release tabs to the replacement diskette drive before install-ing the new drive.

drive-release tabs (2)


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To remove the primary hard-disk drive, follow these steps:


2. Remove the two drive-assembly mounting screws (see Figure 4-11).

3. Lift the primary hard-disk drive out of the card guide assembly.

4. Disconnect the DC power and interface cables from the back of the pri-mary hard-disk drive.

To reinstall the primary hard-disk drive, be sure that the drive’s circuit board is positioned toward the front of the chassis.

When you replace a hard-disk drive, be sure to set the jumpers on the replace-ment drive the same as the jumpers on the drive you removed. For additional information about jumper settings on EIDE drives, see “EIDE Subsystem” in Chapter 1.

primary hard-disk drive

card guide assembly

drive-assemblymounting screws (2)


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


2. Disconnect the DC power and interface cables from the back of the sec-ondary hard-disk drive.

3. Remove the two drive-assembly mounting screws (see Figure 4-12).

4. Slide the secondary hard-disk drive assembly toward the back of the chassis, and lift it out.

To reinstall the hard-disk drive assembly, be sure that the rails on the assembly slide into the grooves of the card guide assembly.

5. To remove the secondary hard-disk drive from the drive bracket, remove the screw securing the drive to the bracket and rotate the drive out of the bracket, as shown in Figure 4-13.

secondary hard-disk drive assembly

drive-assembly mounting screws (2)

card guide assembly


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When you replace a hard-disk drive, be sure to set the jumpers on the replace-ment drive the same as the jumpers on the drive you removed. For additional information about jumper settings on EIDE drives, see “EIDE Subsystem” in Chapter 1.

When you insert the replacement hard-disk drive into the drive bracket, be sure that the two tabs on the bracket fit into the mounting holes on the side of the drive.

secondary hard-disk drive

screw

tabs (2)

drive bracket


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To remove the power supply, follow these steps:

1. Disconnect the AC power cable at the power supply.

2. Disconnect the DC power cables from the POWER and 3.3 connectors on the system board (see Figure 4-18).

3. Disconnect the DC power cables from all the drives.

4. Remove the two power-supply mounting screws from the back of the chassis (see Figure 4-14).

5. Lift the power supply out of the chassis.

power supply

power-supply mounting screws (2)


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To remove the fan assembly, follow these steps:

1. Remove the fan shroud as described in “Microprocessor and Heat Sink Assembly.”

2. Disconnect the fan cable from the J8M1 connector on the system board (see Figure 4-15).

3. Press the two release buttons on the back of the chassis, and lift the chassis cooling fan assembly out of the chassis.

Maintain upward pressure on the fan assembly while you press the two release buttons.

fan assembly

release buttons (2)

back of chassis

J8M1 connector


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To remove the card-guide assembly, follow these steps:

1. Disconnect any cables connected to full-length expansion cards, and remove these expansion cards.

Note the location of each connector and the orientation of any cables attached to the expansion cards before disconnecting these cables.

2. Remove the 3.5-inch diskette drive.

3. Remove the primary hard-disk drive.

4. If a secondary hard-disk drive assembly is present, remove it.

5. Disconnect the control panel cable from connector J9G2 on the system board (see Figure 4-16).

6. Press the four mounting tabs that secure the card guide assembly to the front panel, and press on the tab at the back of the card guide assembly.

7. Lift the card guide assembly, including the control panel cable, out of the chassis.

card guideassembly

mounting tabs (4)

J9G2 connector

tab


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To remove the control-panel board, follow these steps:

1. Remove the front bezel.

2. Remove the card guide assembly.

3. Press the mounting tab to release the control panel board from the card guide assembly (see Figure 4-17), and remove the control panel board.

card guide assembly

control panel board

mounting tab


4-2

6\VWHP�%RDUG�&RPSRQHQWVFigure 4-18 shows the locations of components on the system board. The sub-sections that follow explain how to remove various system board components.

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parallel port connector (PARALLEL)

keyboard connector (KEYBD)

ISA expansion-card connectors (ISA1 and ISA2)

mouse connector (MSE)microprocessor SEPP/SEC cartridge connector (J4J1)

serial port connector (SER1)

PCI expansion-cardconnectors (PCI1, PCI2, and PCI3)

MIDI/game port connector (GAME)1

audio jacks (LINE OUT, LINE IN, and MIC IN)1

diskette-drive interface connector (FLOPPY)

secondary EIDE channel connector (SEC IDE)

DIMM sockets (BANK 0, BANK 1, BANK 2)


fan connector (J8M1)

video featureconnector (J7GI)

3.3-V power input connector (3.3)

USB connectors (USB0, USB1)

power input connec-tor (POWER)

battery socket (BT9K1)

modem audio cable connector for using audio system as speakerphone (TELEPHONY)1

speaker (LS10E1)

1 For systems with onboard audio

CD-ROM drive audio cable connector (CD-ROM)1 primary EIDE channel

connector (PRI IDE)

auxiliary line-in audio connector (AUX)1

network connector (NIC)2

2 For systems with onboard NIC

monitorconnector (VIDEO)

diagnostic codeindicators

control panelconnector (J9G2)

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To remove an expansion card, follow these steps:

1. Disconnect any cables from the expansion card.

Note the location of each connector and the orientation of any cables attached to the expansion card before disconnecting these cables.

2. Remove the retaining screw from the card-mounting bracket (see Figure 4-19).

3. Grasp the expansion card by its corners, and carefully pull it out of its expansion-card connector.

expansion card

card-edge connector

expansion-card connector card guide

retaining screwcard-mounting bracket


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To remove a DIMM, press down and out on the plastic securing tabs at each end of the socket, as shown in Figure 4-20. The DIMM should pop up as it dis-engages from the socket.

To replace a DIMM, orient the DIMM so that the cutouts on its edge connector align with the crossbars in the central groove of the socket, as shown in Figure 4-21. Insert the DIMM straight down into the socket, making sure that it fits into the vertical guides at each end of the socket. Press firmly until the DIMM snaps into place.

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If you have inserted the DIMM correctly, the securing tabs at each end of the socket snap into the cutouts at each end of the DIMM.

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2.

1.

cutouts

crossbars


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To remove or install a Celeron single-edge processor package (SEPP) or a Pentium II single-edge contact (SEC) cartridge and heat sink, follow these steps:

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1. Remove the computer cover and support beam as described in “Computer Cover and Support Beam.”

2. Remove the fan shroud by pressing its two tabs (see Figure 4-22) and gen-tly lifting the shroud until it clears the fan and guide bracket assemblies. Set the fan shroud aside.

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3. For a Pentium II processor, press the SEC cartridge release latches until they snap into place.

heat sink

SEPP

guide bracket assembly

fan shroud

guide bracket assembly latch

fan assembly

fan shroud tabs (2)

SEC cartridge

SEC cartridge release latches (2)


4-2

4. Gently pull out the guide-bracket assembly latch, grasp the SEC cartridge or SEPP firmly, and pull straight up to remove it from the guide bracket assembly.

You must use up to 15 pounds of force to disengage the SEC cartridge or the SEPP from the connector. Do not rock the cartridge or package while removing it.

5. Slide the SEC cartridge or SEPP into the guide bracket assembly, with the heat sink toward the front of the computer, and firmly seat the assembly. For a Pentium II processor, the SEC cartridge release latches should snap outward when the SEC cartridge is fully seated.

You must use up to 25 pounds of force to seat the SEC cartridge or SEPP. Do not rock the cartridge or package while inserting it into the connector.

6. Place the fan shroud over the fan assembly and the guide bracket assem-bly. Then gently press down the shroud until the two fan shroud tabs snap into the two slots on top of the fan assembly.

7. Replace the computer cover and support beam, and reconnect the system to an electrical outlet.

8. Insert the Dell Diagnostics Diskette into drive A, reboot the system, and run the System Set test group in the Dell Diagnostics (refer to Chapter 7, “Running the Dell Diagnostics” in the Reference and Troubleshooting Guide).

If the tests do not complete successfully, refer to “Getting Help” in Chapter 2 for instructions on obtaining technical assistance.


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The computer uses a 3-V CR2032 coin-cell battery. To remove the battery, fol-low these steps:

1. If possible, enter the system setup program (see Appendix A, “System Setup Program,” for instructions) and print the setup screens by pressing the <Print Screen> key.

2. Remove the computer cover and support beam.

3. Remove the battery by prying it out of its socket with your fingers or a blunt, nonconductive object, such as a plastic screwdriver.

To replace the battery, follow these steps:

1. Install the new battery with the “+” side facing up, as shown in Figure 4-23.

2. Start the system setup program, and reset the System Date and System Time options.

3. Compare the system configuration settings, and restore any system con-figuration information that was lost while replacing the battery.

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To remove the system board, follow these steps.

NOTES: Read this entire procedure before you begin.

If possible, print the system setup screens (by pressing the <Print Screen> key) before you turn off the computer, because you will have to restore the configuration information after the system board is replaced.

1. Disconnect any cables attached to the I/O panel on the back of the com-puter (see Figure 4-24).

2. Remove the fan shroud as described in “Microprocessor and Heat Sink Assembly.”

3. Remove any installed expansion cards.

Note the location of each connector and the orientation of any cables attached to the expansion cards before disconnecting these cables.

4. Disconnect all internal cables from the system board.

The cables attached to the PRI IDE, SEC IDE, and FLOPPY connectors (see Figure 4-18) each have two latches securing them to the system board. Press the latch on each end of the cable connector, and pull to release the cable from the system board.

The microprocessor and heat sink assembly (see Figure 4-22), the guide bracket assembly, the expansion cards, and the DIMM modules must be removed from the old system board and transferred to the replacement


system board

3.5-inch diskette drive

I/O gasket


system board. Dell recommends removing these components from the system board while it is still securely mounted in the computer.

5. Remove the microprocessor and heat sink assembly.

6. Remove the guide bracket assembly for the SEPP or SEC cartridge.

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Using a #2 Phillips screwdriver, loosen each of the four nuts (see Figure 4-25) securing the guide bracket assembly to the system board. Remove the assembly from the four threaded posts.

NOTE: The four nuts are captive and are retained in the assembly when loosened. The screws are mounted on the system board.

captive nuts (4)

threaded posts (4)

guide bracket assembly

SEPP/SEC cartridge connectorkey


4-2

7. Remove the system-board mounting screw from the back of the computer (see Figure 4-26).

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8. Lift the system board from the three plastic standoffs that secure the sys-tem board to the chassis (see Figure 4-27).

9. Carefully lift the system board away from the I/O gasket (see Figure 4-24), and remove the board from the computer.

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back of computer

system-board mounting screw

system-board mounting bracket

system-board mounting screw

configuration jumper J9D3


screws (3)


10. Remove the mounting bracket from the back of the system board (see Figure 4-28).

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To install a replacement system board, install the guide bracket assembly for the SEPP or SEC cartridge. The assembly is keyed for correct insertion (see Figure 4-25). Then install the microprocessor and heat sink assembly. Transfer the DIMMs to the new system board.

When installing a replacement system board, angle the back of the board downward and carefully align the connectors on the back edge of the board with the cutouts in the I/O gasket (see Figure 4-24). When properly aligned, the board connectors slide into the I/O gasket as you lower the board into position in the chassis and reseat it on the three plastic standoffs. Then replace the system-board mounting screw.

NOTE: The system-board mounting screw pulls the system board against the I/O gasket to prevent EMI leakage.

After installing the replacement system board, replace the expansion cards that you removed from the old system board.

When reconnecting the cables to a system board with integrated sound, be sure to connect the CD-ROM drive audio cable to the connector nearest the back edge of the system board. The middle audio connector is used with a modem.

To configure the system after installing a replacement board, follow these steps:

1. Install the jumper plug on pins 2 and 3 of configuration jumper J9D3 (see Figure 4-27) to select Maintenance mode.

system board


1.

2.


4-3

2. Replace the cover and support beam and boot the system.

The computer automatically starts the system setup program, adds the Maintenance option to the menu bar, and displays the Maintenance screen.

3. If necessary, press <Del> to enter the system setup program to change the Processor Speed setting to match the speed of the installed microprocessor.

If the speed listed is not correct, press <Enter> to display the speed set-tings. Select the appropriate speed and press <Enter>.

4. Select Clear All Passwords and press <Enter> twice.

5. Press <F10> to exit the system setup program and save any changes you made.

6. Turn off the system, remove the computer cover and support beam, and replace the jumper plug on pins 1 and 2 of jumper J9D3 to select Normal mode operation.

7. Replace the cover and support beam and boot the system. If necessary, reenter the system setup program and reset the system configuration information.

To check the installation and make sure the system functions properly, run the system diagnostics as described in Chapter 7, “Running the Dell Diag-nostics,” in the Reference and Troubleshooting Guide.


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This appendix describes the system setup program, which is used to change the system configuration information stored in CMOS and NVRAM on the sys-tem board.

To enter the system setup program, follow these steps:

1. Turn on (or reboot) the system.

2. When prompted to Press <DEL> to enter SETUP , press the <Del>key immediately.

If you wait too long and the operating system begins to load into memory, 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.

6\VWHP�6HWXS�6FUHHQVThe system setup program consists of a number of menus and submenus with configuration options and information. The menu bar provides access to the following six screens:

� Main screen — Provides settings for the basic system configuration

� Advanced screen — Provides detailed settings for some system features

� Security screen — Provides indications and settings for system password and setup password

� Power screen — Provides settings for the system power-management features

� Boot screen — Provides information about which device boots the system

� Exit screen — Provides selections for saving and loading the configura-tions and options

In addition to these screens, options identified by a right arrow (see Figure A-2 for an example) provide access to submenus.

System Setup Program A-1

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BIOS Version Displays the version of the BIOS being used.

Processor Type

Displays the type of microprocessor installed.

Processor Speed

Displays the internal speed of the microproces-sor.

Cache RAM Indicates the amount of L2 cache memory installed.

Service Tag Displays the system’s service tag.

System Memory

Displays the amount of system memory installed, ranging from 32 to 384 MB, in the three DIMM sockets on the system board.

Memory Bank n

Displays the size and type of memory in the DIMM sockets.

Language Indicates the language in which the system setup program is displayed.



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L2 Cache ECC Support

When Enabled (default), this option allows error checking to occur on data accessed from the L2 cache. If set to Disabled, error checking is not performed.

CAUTION: Be sure that Enabled is selected before running mathematical application pro-grams. Otherwise, error checking will not be performed on the cache data.

System Time Resets the time on the system’s internal clock.

System Date Resets the date on the system’s internal calen-dar.

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Plug & Play O/S

Determines whether the system is configured to support Plug and Play devices from the operating system or from the system BIOS. Leave this option set to No so the BIOS handles all Plug and Play operation.

NOTE: Be sure this option is set to No before run-ning Dell Diagnostics. Otherwise, some diagnos-tics may incorrectly fail.

Reset Configura-tion Data

Permits resetting Plug and Play configuration data to default values. Yes resets the data; No (default) retains the current Plug and Play settings. If set to Yes, configuration data reverts to default values the next time the system boots. This option automati-cally reverts back to the No setting.

Numlock Selects the power-on state for Num Lock. Options are Auto (default), On, and Off.

Peripheral Configuration

Displays the Peripheral Configuration submenu. Refer to “Peripheral Configuration Submenu” found next in this appendix.

IDE Configuration

Displays the IDE Configuration submenu. Refer to “IDE Configuration Submenu” found later in this appendix.

Diskette Options

Displays the Diskette Options submenu. Refer to “Diskette Options Submenu” found later in this appendix.

DMI Event Logging

Displays the DMI Event Logging submenu. Refer to “DMI Event Logging Submenu” found later in this appendix.

Video Configuration

Displays the Video Configuration submenu. Refer to “Video Configuration Submenu” found later in this appendix.

Resource Configuration

Displays the Resource Configuration submenu for allocating IRQs and memory ranges. Refer to “Resource Configuration Submenu” found later in this appendix.



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Serial port A Configures the serial port. Set this option to Auto (default), Enabled, or Disabled. If set to Enabled, you can set the following additional options:

Base I/O Address

Available I/O addresses are COM1, COM2, COM3, and COM4.

Interrupt Available interrupts are IRQ3 and IRQ4.

Parallel port Configures the parallel port. Set this option to Auto (default), Enabled, or Disabled. Depending on the port setting, you can set the following additional options:

Mode If port is set to Auto or Enabled, available modes are Output Only, Bi-Directional, ECP, and EPP.

NOTE: Refer to the device manufacturer's docu-mentation for information on which mode to use before changing this setting.

Base I/O Address

If port is set to Enabled, available I/O addresses are 378h (default), 278h, 3BC, and 228h.

Interrupt If port is set to Enabled, available interrupts are IRQ7 and IRQ5.



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Audio NOTE: This option is available in onboard audio systems only.

Determines if onboard audio controller is Enabled (default) or Disabled. Set this option to Disabled if you are using a sound card instead of the onboard audio controller or if the resources used by the controller are needed.

NIC NOTE: This option is available in onboard NIC sys-tems only.

Determines if onboard NIC is Enabled (default) or Disabled. Set this option to Disabled if you are using a network card instead of the onboard NIC or if the resources used by the controller are needed.

Legacy USB Support

Disabled is default. Enables support for legacy USB devices.

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IDE controller Configures the integrated primary and secondary EIDE controllers and detects the types of drives attached to them. If set to Primary, Secondary, or Both, the designated controller(s) are enabled, and the types of drives attached are displayed. If set to either Primary or Secondary, the other controller is not enabled and the IRQ it normally uses becomes available. If set to Disabled, the system cannot detect any drives attached to the controllers and displays None for all four IDE drive options.

Primary IDE Master

Identifies the first drive attached to the primary EIDE interface, usually the boot hard-disk drive. Refer to “Primary IDE Master Submenu” found next in this appendix.

Primary IDE Slave

Identifies the second drive attached to the primary EIDE interface, usually a second hard-disk drive. The format of this submenu is the same as the one described in “Primary IDE Mas-ter Submenu” found next in this appendix.

Secondary IDE Master

Identifies the first drive attached to the secondary EIDE interface, usually a CD-ROM or tape drive. The format of this submenu is the same as the one described in “Primary IDE Master Submenu” found next in this appendix.

Secondary IDE Slave

Identifies the second drive attached to the sec-ondary EIDE interface, usually a CD-ROM or tape drive. The format of this submenu is the same as the one described in “Primary IDE Master Sub-menu” found next in this appendix.



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Type Specifies the type of hard-disk drive. If the drive supports the auto-detect feature, set this option to Auto. Cylinders, Heads, and Sectors can be edited if Type is set to User. For a non-IDE drive, set Type to None.

Maximum Capacity

Displays the drive’s maximum storage capacity.

Multi-sector Transfers

Determines the number of sectors per block dur-ing multiple-sector transfers. If Type is set to User, set Multi-sector Transfers to 2 Sectors, 4 Sectors, 8 Sectors, or 16 Sectors or disable the feature.

LBA Mode Control

Set to Enabled (default) unless directed to change it by a Dell technical support representa-tive.

Transfer Mode

Selects method of moving data to and from the EIDE drive. Options include Standard and the PIO modes 1, 2, 3, and 4, which can improve the performance of a hard-disk drive. (The higher the PIO number, the faster the transfer; most newer drives support Fast PIO 4.) For the optimum transfer mode, set Type to Auto. If Type is set to Disabled, PIO is turned off.

Ultra DMA Sets the Ultra DMA mode for the drive.



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Floppy disk controller

Configures diskette drive interface. Options are Auto, Enabled (default), and Disabled.

Diskette A Identifies the boot diskette drive in the computer. The default is 1.44/1.25 MB 3 1/2”.

Diskette Write Protect

Protects a diskette from being written to when set to Enabled. When this option is set to Dis-abled (default), the diskette is not protected unless the write-protect tab is in place.



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Event log capacity

Displays information about the event log.

Event log validity

Displays Invalid if an error was detected in the event log.

View DMI Event Log

Click Enter to view the DMI Event Log. To return to the DMI Event Logging submenu, click Con-tinue in the Event Log window.

Clear all DMI event logs

Clears the DMI Event Log when the system restarts if set to Yes. Retains the event log infor-mation if set to No (default).

Event logging Permits logging of DMI events. Set this option to No if no record of DMI events is desired.

Mark DMI events as read

Marks the DMI events as read in the DMI Event Log.



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Palette Snooping

Allows an ISA expansion card to check a PCI expansion card for an updated graphics palette. If this option is set to Disabled, the ISA expansion card may not be updated along with the PCI expansion card.

AGP Aperture Size

Sets the aperture size for the AGP video control-ler to 64 MB (default) or 256 MB.

Default Pri-mary Video Adapter

If a video card is installed in a PCI slot for use with the Windows 98 multiple-monitor feature, this option selects the default primary video adapter. Set to AGP (default) to use the onboard AGP video controller as the primary video adapter. Set to PCI to select a PCI video card as the primary video adapter.



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xxxx–xxxx Reserves the specified UMB (for example C800–CBFF) for use by legacy ISA devices. Settings are Available (default) and Reserved.

IRQ n Reserves the specified IRQ for use by legacy ISA devices. Settings are Available (default) and Reserved.



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User Password Is

Indicates whether a user password has been assigned.

Setup Password Is

Indicates whether a setup password has been assigned.

Set User Password

Allows you to assign, change, or clear a user password, which controls access to the com-puter at start-up.

Set Setup Password

Allows assigning, changing, or clearing a setup password. The setup password provides access to both the computer and the system setup pro-gram.

Clear User Clears the user password.

User Setup Access

Controls user access to the system setup pro-gram. Enabled (default) allows user access. Set this option to Disabled to prevent user access to the system setup program.



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Power Management

Enables or disables Fan Always On, Inactivity Timer, and Hard Drive options.

Fan Always On

When set to Yes (default), the fan remains on as long as the system is turned on. When set to No, the fan turns off in Suspend mode.

Inactivity Timer

Determines the period of system inactivity (between 1 and 120 minutes) before certain sys-tem components enter a low-power mode. To dis-able power management, leave this option set to Off (default).NOTE: Leave this option set to Off if your operat-ing system has power management controls.

Hard Drive When set to Enabled (default), Hard Drive allows most EIDE hard-disk drives to automatically switch into low-power mode after a specified period of system inactivity (called a time-out). The time-out period is set with the Inactivity Timer option. When Hard Drive is set to Disabled, hard-disk drives do not switch into low-power mode.


VESA Video Power Down

NOTE: For the Windows 98 operating system, use the Display icon in the Control Panel to save monitor power rather than this option.

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This option selects a VESA® power management mode for the monitor during periods of system inactivity. Settings for this option are Disabled, Standby (default), Suspend, and Sleep.

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QuickBoot Mode

When set to Enabled, this option shortens POST by eliminating some tests. If set to Disabled (default), all POST tests occur.

Restore On After AC/Power Loss

Determines what state the system enters when AC power is restored after a power loss. Settings are:

� Last State — System returns to the state it was in when power was lost.

� Stay Off — System stays off when power is restored; you must press the power button to restore power.

� Power On (default) — System turns on when power is restored.



First Boot Device

Determines which device the system tries to boot from first. Use the up- or down-arrow key to highlight a device, and press the plus (+) or minus (–) key to move the item up or down the list. Set-tings for this option are:

� Removable Devices (default) — Normally diskette drive A

� Hard Drive — Hard-disk drive connected to primary EIDE channel

� ATAPI CD-ROM Drive — CD-ROM drive

� Network Boot — Drive on the network server

Second Boot Device

Determines which device the system tries to boot from if it cannot boot from the device selected for First Boot Device. Settings for this option are the same as for First Boot Device.

Third Boot Device

Determines which device the system tries to boot from if it cannot boot from the devices selected for First Boot Device and Second Boot Device. Settings for this option are the same as for First Boot Device.

Fourth Boot Device

Determines which device the system tries to boot from if it cannot boot from the devices selected for First Boot Device, Second Boot Device, and Third Boot Device. Settings for this option are the same as for First Boot Device.

Hard Drive Displays order of bootable hard-disk drives. Refer to “Hard Drive Submenu” found next in this appendix.

Removable Devices

Displays a list of removable devices. Refer to “Removable Devices Submenu” found later in this appendix.

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device designa-tion

The computer system attempts to boot the oper-ating system from the first device listed. To select a new boot device, reorder the list: Use the up- or down-arrow key to highlight a device, and press the plus (+) or minus (–) key to move the item up or down the list. If no operating sys-tem is found on the boot device, the system attempts to boot from each successive device until an operating system is found.

Bootable Add-In Card

Same as preceding item.



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Legacy Floppy Drives

The operating system assigns drive letters to removable devices in the order listed on the Removable Devices submenu. To change the drive designations, reorder the list: Use the up- or down-arrow key to highlight a device, and press the plus (+) or minus (–) key to move the item up or down the list.



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Exit Saving Changes

Saves any changes you have made, exits the sys-tem setup program, and restarts the system.

Exit Discard-ing Changes

Discards any changes you have made, exits the system setup program, and restarts the system.

Load Setup Defaults

Discards any changes you have made and reverts all options to their original default settings, but does not exit the system setup program.

Load Custom Defaults

Loads settings saved using Save Custom Defaults option. Press <Enter>. Then press the spacebar to select Yes or No at the confirmation pop-up menu, and press <Enter> again.

Save Custom Defaults

Saves any changes you have made, but does not exit the system setup program.

Discard Changes

Discards any changes you have made and reverts all options to their last saved settings, but does not exit the system setup program.



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3.5-inch insert removal, 4-6

$

AC powerabout, 1-7voltage selection switch, 1-5

adapter card, 1-6, 4-21

advanced expansion subsystem, 1-6

Advanced screen, system setup program, A-3

%

back-panel features, 1-5

batterylocation, 1-12removal, 4-25

beep codesabout, 3-3list of, 3-4

bezel removal, 4-5

boot routineobserving when troubleshooting,

2-3

Boot screen, system setup program, A-16

&

cache memory, 1-17

card-guide assembly removal, 4-18

chassis cooling fan assemblyremoval, 4-17

computerback-panel features, 1-5features list, 1-2front-panel features, 1-4, 1-5orientation, 1-3overview, 1-1service, 1-6technical specifications, 1-17

configuration jumperlocation, 1-12, 1-13, 4-20

connectorsback panel, 1-5system board, 1-12

control-panel board removal, 4-19

cover and support beam removal, 4-2

'

DC powercables, 1-8connector pin assignments, 1-10distribution diagram, 1-9voltage ranges, 1-7

desktop computerinternal view, 1-4

Index 1

2

diagnostic code indicators, 3-1

diagnostic codes, 3-1

diagnostics, 2-6

DIMMslocation, 1-12performance, 1-13removal, 4-22

diskette drive removal, 4-12

diskette drivesinterface connector, 1-12, 4-20

DMA channel assignments, 1-16

drive cagelocation, desktop, 1-4location, mini tower, 1-5removal, 4-7

drives3.5-inch diskette, removal, 4-125.25-inch, removal, 4-8bays, 1-19lower 3.5-inch, removal, 4-11primary hard-disk, removal, 4-13secondary hard-disk, removal, 4-14types of, 1-6types supported, 1-2upper 3.5-inch, removal, 4-10

(

EIDE subsystem, 1-6

EIDE support, 1-2

error messages, 3-4

Exit screen, system setup program, A-20

expansion cardconfiguration, 1-6removal, 4-21

expansion-card guide, 4-18

expansion-card slots, 1-6

external visual inspection, 2-2

)

fan removal, 4-17

fan shroud, 4-23

features list, 1-2

front-bezel removal, 4-5

front-panel features, 1-4, 1-5

front-panel insert removal, 4-6

*

getting helpby telephone, 2-6via Web site, 2-6

grounding procedure, 4-1

+

hard-disk drivesEIDE support on system board, 1-2location, 1-4, 1-5options, 1-6removal, primary, 4-13removal, secondary, 4-14

,

I/O connectors, 1-5

initial procedures, 2-1

internal visual inspection, 2-4

interrupt assignments, 1-15

ISA expansion-card slots, 1-6

-

jacksmicrophone, 1-12, 4-20

jumper, 1-13


.

key to enter System Setup program, A-1

0

main memory, 1-13

Main screen, system setup program, A-2

Microprocessorremoval, 4-23

microprocessortype supported, 1-17

mini tower computerinternal view, 1-5

2

OTTs, 2-6

3

passwordssetting, A-13

PCI expansion-card slots, 1-6

POST beep codes, 3-4

powerAC power receptacle, 1-5connector pin assignments, 1-10DC power cables, 1-7DC power distribution diagram, 1-9voltage selection switch, 1-5

Power screen, system setup program, A-14

power supplyabout, 1-7location, desktop, 1-4location, mini tower, 1-5removal, 4-16

precautions, 4-1

primary hard-disk drive removal, 4-13

6

SEC cartridgeabout, 1-1guide-bracket assembly removal,

4-27

secondary hard-disk drive removal, 4-14

Security screen, system setup program, A-13

service, 1-6

socketsbattery, 1-12DIMMs, 1-12

specifications, 1-17

system batterylocation, 1-12removal, 4-25

system boardcomponents, 1-12, 4-20jumper, location, 1-13jumper, settings, 1-14removal, 4-26

system error messages, 3-4

system power supply. See power supply

System Setup programentering, A-1menus, A-1

system setup programAdvanced screen, A-3Boot screen, A-16Diskette Options submenu, A-9DMI Event Logging submenu, A-10Exit screen, A-20Hard Drive submenu, A-18IDE Configuration submenu, A-6Main screen, A-2Peripheral Configuration submenu,

A-5

Index 3

4

system setup program (continued)Power screen, A-14Primary IDE Master submenu, A-8Removable Devices submenu, A-19Resource Configuration submenu,

A-12Security screen, A-13Video Configuration submenu, A-11

7

technical specifications, 1-17

tools, recommended, 4-1

troubleshootingboot routine, 2-3diagnostic codes, 3-1diskette-based diagnostics, 2-6external visual inspection, 2-2getting help, 2-6initial procedures, 2-1internal visual inspection, 2-4resource conflicts, 2-5service, 1-6

9

visual inspectionexternal, 2-2internal, 2-4

voltage selection switchlocation, 1-5

:

warnings, 4-2

World Wide Web site, 2-6


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