Dell 100-Mbps - page 25

System Overview 1-17

System Clocks

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

speed)

Diskette/communications

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

Memory

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

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

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

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

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

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

Drives

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

kette drive; two 5.25-inch bays for half-height

diskette drives, tape drives, or CD-ROM

drives

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

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

drive

Ports

Externally accessible:

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

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

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

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

PS/2-compatible

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

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

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

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

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

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

Table 1-5. Technical Specifications (continued)

Contents

Main Page Contents Chapter 1 System Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Chapter 2 Basic Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 Chapter 3 Beep Codes and Error Messages . . . . . . . . . . . . . . . . . . 3-1 Chapter 4 Removing and Replacing Parts . . . . . . . . . . . . . . . . . . . 4-1 Appendix A System Setup Program . . . . . . . . . . . . . . . . . . . . . . . . . . A-1 Index Figures Tables Page ead This First W arnings, Cautions, and Notes Chapter 1 System Overview ystem Features Figure 1-1. System Unit Orientation 1-4 Dell OptiPlex GX Systems Service Manual Figure 1-2. Front-Panel Features Figure 1-3. Internal View Dual-Processor Capability Advanced Expansion Subsystem Figure 1-4. Riser-Board Expansion-Card Connectors Hard-Disk Drive Options Enhanced Dual-Interface EIDE Subsystem Audio Controller PCI Video Card NIC USB Desktop Chassis Thermal Monitoring ystem Unit System Power Supply Pin Assignments for the DC Power Connectors Table 1-1. DC Voltage Ranges System Overview 1-9 Figure 1-5. DC Power Connector P1 Figure 1-6. DC Power Connectors P2, P3, P4, P5, and P6 P2, P3, P5, P6 1-10 Dell OptiPlex GX Systems Service Manual DC Power Distribution Figure 1-8. DC Power Cables Figures 1-8 and 1-9 provide the following information about DC power distribution: P7 Figure 1-9. Power Distribution System Overview 1-11 1-12 Dell OptiPlex GX Systems Service Manual System Board Layout The subsections that follow provide service-related information about the sys- tem board components. Figure 1-10. System Board Components Video Memory Main Memory Figure 1-11. System Board Jumpers System Board Jumpers nterrupt Assignments Table 1-2. Jumper Descriptions Table 1-3. Interrupt Assignments D MA Channel Assignments Table 1-4. DREQ Line Assignments Table 1-3. Interrupt Assignments (continued) echnical Specifications Table 1-5. Technical Specifications Page Page Page Page Chapter 2 Basic Troubleshooting nitial User Contact xternal Visual Inspection O bserving the Boot Routine nternal Visual Inspection liminating Resource Conflicts unning the Diskette-Based Diagnostics G etting Help Chapter 3 Beep Codes and Error Messages P OST Beep Codes Table 3-1. POST Beep Codes Table 3-1. POST Beep Codes (continued) ystem Error Messages Table 3-2. System Error Messages Page Page Page Page Page Page Chapter 4 Removing and Replacing Parts ecommended Tools P recautionary Measures F loor Stand Figure 4-1. Floor Stand Removal ystem Unit Cover Figure 4-2. System-Unit Cover Removal Figure 4-3. Padlock Removal ject, Power, and Reset Buttons Figure 4-4. Eject, Power, and Reset Button Removal F ront-Panel Inserts Figure 4-5. Front-Panel Insert Removal ndicator Card Figure 4-6. Indicator Card Removal peaker Figure 4-7. Speaker Removal Removing and Replacing Parts 4-9 D rives Figure 4-8. Drive Hardware Drives in the Drive Cage Figure 4-9. 3.5-Inch Diskette Drive Removal Page Hard-Disk Drives Figure 4-11. Hard-Disk Drive Bracket Removal Figure 4-12. Hard-Disk Drive Removal ystem Power Supply Figure 4-13. Power Supply Removal M icroprocessor Fan Figure 4-14. Microprocessor Fan Removal 4-16 Dell OptiPlex GX Systems Service Manual ystem Board Components The subsections that follow contain procedures for removing system board components. Figure 4-15. System Board Components Expansion Cards Expansion-Card Cage Figure 4-16. Expansion-Card Cage Removal Expansion Card Figure 4-17. Expansion-Card Removal Riser Board Figure 4-18. Riser Board Removal DIMMs Figure 4-19. DIMM Removal Figure 4-20. DIMM Installation Microprocessor/Heat Sink Assembly Figure 4-21. Microprocessor Securing Clip Figure 4-22. Microprocessor Removal Terminator or Add-In Card Terminator Card Figure 4-23. Terminator Card Removal Add-In Card Figure 4-24. Add-In Card Removal System Battery Figure 4-25. System Battery Removal ystem Board Figure 4-26. System Board Removal Appendix A System Setup Program A-2 Dell OptiPlex GX Systems Service Manual ystem Setup Screens XXXXX Figure A-1. System Setup Screens XXXXX Table A-1. System Setup Categories Page Page Page Index Numbers A B C E F H I J L M N P R T U V