Dell OptiPlex GX1 User manual

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____________________
Information in this document is subject to change without notice.
© 1996¤1998 Dell Computer Corporation. All rights reserved.
Reproduction in any manner whatsoever without the written permission of Dell Computer Corporation is strictly forbidden.
Trademarksusedinthistext:
Dell ,the DELL logo,and OptiPlex areregisteredtrademarksofDellComputerCorporation; Intel and Pentium areregistered
trademarks and
MMX is a trademark of Intel Corporation; Microsoft , Windows , and MS-DOS are registered trademarks of Microsoft Corporation; IBM
and
LANDesk are registered trademarks of International Business Machines Corporation; 3Com is a registered trademark of 3Com Corporation.
Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products. Dell
Computer Corporation disclaims any proprietary interest in trademarks and trade names other than its own.
March 1998 P/N 21633

v
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&KDSWHU 6\VWHP2YHUYLHZ  
Chassis Differences. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Chassis Similarities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Standard Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Pentium II Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Secondary L2 Cache . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Main Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Upgradable BIOS in Flash Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
EIDE Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
SMART Technology. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Integrated Diskette/Tape Drive Controller . . . . . . . . . . . . . . . . . . . . . . . 1-4
Integrated SVGA Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Integrated Audio Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
ATI Multimedia Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Telephony Application Programming Interface . . . . . . . . . . . . . . . . . . . 1-6
Chassis Intrusion Detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Integrated Ethernet NIC Support (Optional). . . . . . . . . . . . . . . . . . . . . . 1-6
Network Cable Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Full Set of I/O Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Location of Major Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Advanced Expansion Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
OptiPlex NX1 Computer’s Expansion-Card Slot. . . . . . . . . . . . . . . . . . 1-13
Low-Profile Computer’s Expansion-Card Slots . . . . . . . . . . . . . . . . . . 1-13
Midsize Computer’s Expansion-Card Slots . . . . . . . . . . . . . . . . . . . . 1-13
Mini Tower Computer’s Expansion-Card Slots . . . . . . . . . . . . . . . . . 1-15
Upgrade Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
Microprocessor/L2 Cache Upgrades . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
Main Memory Expansion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
Video-Memory Upgrade Option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
Computer Service Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
Remote Management Support Features (Optional). . . . . . . . . . . . . . . 1-16
Online Documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16

vi
System Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
System-Board Service Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
System Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
System Board Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
Interrupt Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
DMA Channel Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
Hard-Disk Drive Service Information . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
Hard-Disk Drive for the Low-Profile Computer . . . . . . . . . . . . . . . 1-21
Hard-Disk Drive for the Midsize Computer . . . . . . . . . . . . . . . . . . 1-21
Hard-Disk Drive for the Mini Tower Computer . . . . . . . . . . . . . . . 1-22
Hard-Disk Drive for the OptiPlex NX1 Computer. . . . . . . . . . . . . . 1-22
Power-Supply Service Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
Pin Assignments for the DC Power Connectors . . . . . . . . . . . . . 1-23
DC Power Distribution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24
System Power Supply for the OptiPlex NX1 Computer . . . . . . . . . . . 1-29
OptiPlex NX1 Pin Assignments for the DC Power Connectors . . 1-30
DC Power Distribution for the OptiPlex NX1 Computer . . . . . . . . 1-31
Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33
&KDSWHU %DVLF7URXEOHVKRRWLQJ  
Initial User Contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
External Visual Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Observing the Boot Routine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Internal Visual Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Eliminating Resource Conflicts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Running the System Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Server-Based Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Hard-Disk–Based Diagnostics (OptiPlex NX1 Systems Only) . . . . . . . . 2-7
Diskette-Based Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Connecting an External Diskette Drive to the
OptiPlex NX1 Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Running the Diskette-Based Diagnostics . . . . . . . . . . . . . . . . . . . 2-10
Getting Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
&KDSWHU %HHS&RGHVDQG(UURU0HVVDJHV 
POST Beep Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
System Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

vii
&KDSWHU 5HPRYLQJDQG5HSODFLQJ3DUWVRQWKH/RZ3URILOH
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Recommended Tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Precautionary Measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Inside the Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Computer Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Eject, Power, and Reset Buttons. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Front-Panel Inserts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
Drives. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Externally Accessible Drive Assemblies . . . . . . . . . . . . . . . . . . . . . . . . 4-7
3.5-Inch Diskette Drive Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
5.25-Inch Drive Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Hard-Disk Drive Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
System Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
Expansion Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
Expansion-Card Cage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
Expansion Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13
Riser Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
System Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15
System Board Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
DIMMs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17
Video Memory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18
Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19
SEC Cartridge/Heat Sink Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19
System Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-20
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Recommended Tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Precautionary Measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Inside the Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Optional Stand. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Computer Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
Eject, Power, and Reset Buttons. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Front-Panel Inserts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8

viii
Drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
Externally Accessible Drive Assemblies . . . . . . . . . . . . . . . . . . . . . . . . 5-9
3.5-Inch Diskette Drive Assembly . . . . . . . . . . . . . . . . . . . . . . . . . 5-10
5.25-Inch Drive Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
Hard-Disk Drive Bracket. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12
Hard-Disk Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13
System Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14
Expansion Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15
Expansion-Card Cage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15
Expansion Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-16
Riser Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-17
System Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-18
System Board Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-19
DIMMs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-20
Video Memory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-21
Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-22
SEC Cartridge/Heat Sink Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . 5-22
System Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-23
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0LQL7RZHU&KDVVLV 
Recommended Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Precautionary Measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Inside the Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Computer Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
Front Bezel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
Eject, Power, and Reset Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
Front-Panel Inserts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9
Drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10
Externally Accessible Drive Assemblies . . . . . . . . . . . . . . . . . . . . . . . 6-10
3.5-Inch Diskette Drive Assembly . . . . . . . . . . . . . . . . . . . . . . . . . 6-11
5.25-Inch Drive Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12
Hard-Disk Drive Bracket. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14
Hard-Disk Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-15
System Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16
Expansion Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-17
Expansion-Card Cage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-17
Expansion Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-18
Riser Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-19
System Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-20

ix
System Board Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-21
DIMMs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-22
Video Memory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-23
Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-24
SEC Cartridge/Heat Sink Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . 6-24
System Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-25
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Recommended Tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Precautionary Measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Inside the Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Optional Stand. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Computer Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4
Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6
Hard-Disk Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7
System Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
Expansion-Card Cage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9
Expansion Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10
Riser Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-11
System Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-12
System Board Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-13
DIMMs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-14
Video Memory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-15
Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-16
SEC Cartridge/Heat Sink Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . 7-16
System Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-17
$SSHQGL[$ 6\VWHP6HWXS3URJUDP $
System Setup Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
Device List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7
,QGH[
)LJXUHV Figure 1-1. Chassis Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
Figure 1-2. Front-Panel Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-8
Figure 1-3. Internal View of the Low-Profile Chassis . . . . . . . . . . . . . . . .1-9
Figure 1-4. Internal View of the Midsize Chassis . . . . . . . . . . . . . . . . . .1-10
Figure 1-5. Internal View of the Mini Tower Chassis . . . . . . . . . . . . . . .1-11
Figure 1-6. Internal View of the OptiPlex NX1 Chassis. . . . . . . . . . . . . .1-12
Figure 1-7. Riser Board for the OptiPlex NX1 Computer. . . . . . . . . . . . .1-13

x
Figure 1-8. Riser Board for the Low-Profile Computer . . . . . . . . . . . . . . 1-13
Figure 1-9. Riser Board for the Midsize Computer (Option 1). . . . . . . . . 1-14
Figure 1-10. Riser Board for the Midsize Computer (Option 2). . . . . . . . . 1-14
Figure 1-11. Riser Board for the Mini Tower Computer . . . . . . . . . . . . . . 1-15
Figure 1-12. System Board Components . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
Figure 1-13. System Board Jumpers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
Figure 1-14. Computer Orientation Information . . . . . . . . . . . . . . . . . . . . 1-21
Figure 1-15. DC Power Connector P1. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23
Figure 1-16. DC Power Connectors P2 (Midsize and Mini Tower
Chassis); P3, P4, P5, P6, and P9
(All OptiPlex GX1 Chassis) . . . . . . . . . . . . . . . . . . . . . . . . . .1-24
Figure 1-17. DC Power Connectors P2 (Low-Profile Chassis)
and P7 (All OptiPlex GX1 Chassis) . . . . . . . . . . . . . . . . . . . . 1-24
Figure 1-18. DC Power Cables for the Low-Profile Computer . . . . . . . . . 1-25
Figure 1-19. DC Power Distribution for the Low-Profile Computer. . . . . . 1-26
Figure 1-20. DC Power Cables for the Midsize and
Mini Tower Computers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27
Figure 1-21. DC Power Distribution for the Midsize Computer . . . . . . . .1-28
Figure 1-22. DC Power Distribution for the Mini Tower Computer. . . . . . 1-29
Figure 1-23. DC Power Connector P1 for the
OptiPlex NX1 Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30
Figure 1-24. DC Power Connector P2 for the
OptiPlex NX1 Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31
Figure 1-25. DC Power Connector P3 for the
OptiPlex NX1 Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31
Figure 1-26. DC Power Cables for the OptiPlex NX1 Computer. . . . . . . . 1-31
Figure 1-27. DC Power Distribution for the OptiPlex NX1 Computer . . . .1-32
Figure 2-1. Connecting an External Diskette Drive to the
OptiPlex NX1 Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Figure 4-1. Internal View of the Low-Profile Computer. . . . . . . . . . . . . . . 4-3
Figure 4-2. Computer Cover Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
Figure 4-3. Eject, Power, and Reset Button Removal . . . . . . . . . . . . . .4-4
Figure 4-4. Front-Panel Insert Removal . . . . . . . . . . . . . . . . . . . . . . . . . .4-5
Figure 4-5. Control Panel Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-6
Figure 4-6. Drive Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7
Figure 4-7. 3.5-Inch Diskette Drive Removal. . . . . . . . . . . . . . . . . . . . . . . 4-8
Figure 4-8. 5.25-Inch Drive Assembly Removal . . . . . . . . . . . . . . . . . . . . 4-9
Figure 4-9. Hard-Disk Drive Assembly Removal . . . . . . . . . . . . . . . . . .4-10
Figure 4-10. System Power-Supply Removal . . . . . . . . . . . . . . . . . . . . . . 4-11
Figure 4-11. Expansion-Card Cage Removal . . . . . . . . . . . . . . . . . . . . . . . 4-12
Figure 4-12. Expansion-Card Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13
Figure 4-13. Riser Board Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
Figure 4-14. System Board Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15
Figure 4-15. System Board Components . . . . . . . . . . . . . . . . . . . . . . . . . 4-16

xi
Figure 4-16. DIMM Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-17
Figure 4-17. DIMM Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-17
Figure 4-18. Installing a Video-Memory Upgrade Module. . . . . . . . . . . . .4-18
Figure 4-19. SEC Cartridge/Heat Sink Removal. . . . . . . . . . . . . . . . . . . . .4-19
Figure 4-20. System Battery Installation . . . . . . . . . . . . . . . . . . . . . . . . . .4-20
Figure 5-1. Internal View of the Midsize Computer. . . . . . . . . . . . . . . . . .5-3
Figure 5-2. Optional-Stand Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-4
Figure 5-3. Computer Cover Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . .5-5
Figure 5-4. Eject, Power, and Reset Button Removal . . . . . . . . . . . . . . .5-6
Figure 5-5. Front-Panel Insert Removal . . . . . . . . . . . . . . . . . . . . . . . . . .5-7
Figure 5-6. Control Panel Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-8
Figure 5-7. Drive Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-9
Figure 5-8. 3.5-Inch Diskette Drive Removal. . . . . . . . . . . . . . . . . . . . . .5-10
Figure 5-9. 5.25-Inch Drive Assembly Removal . . . . . . . . . . . . . . . . . . .5-11
Figure 5-10. 5.25-Inch Drive Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . .5-11
Figure 5-11. Hard-Disk Drive Bracket Removal . . . . . . . . . . . . . . . . . . .5-12
Figure 5-12. Hard-Disk Drive Removal . . . . . . . . . . . . . . . . . . . . . . . . . . .5-13
Figure 5-13. System Power-Supply Removal . . . . . . . . . . . . . . . . . . . . . .5-14
Figure 5-14. Expansion-Card Cage Removal . . . . . . . . . . . . . . . . . . . . . . .5-15
Figure 5-15. Expansion-Card Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . .5-16
Figure 5-16. Riser Board Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-17
Figure 5-17. System Board Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-18
Figure 5-18. System Board Components . . . . . . . . . . . . . . . . . . . . . . . . .5-19
Figure 5-19. DIMM Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-20
Figure 5-20. DIMM Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-20
Figure 5-21. Installing a Video-Memory Upgrade Module. . . . . . . . . . . . .5-21
Figure 5-22. SEC Cartridge/Heat Sink Removal. . . . . . . . . . . . . . . . . . . . .5-22
Figure 5-23. System Battery Installation . . . . . . . . . . . . . . . . . . . . . . . . . .5-23
Figure 6-1. Internal View of the Mini Tower Computer. . . . . . . . . . . . . . .6-3
Figure 6-2. Computer Cover Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . .6-4
Figure 6-3. Front-Bezel Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-5
Figure 6-4. Eject, Power, and Reset Button Removal . . . . . . . . . . . . . . .6-6
Figure 6-5. 5.25-Inch Front-Panel Insert Removal . . . . . . . . . . . . . . . . . .6-7
Figure 6-6. 3.5-Inch Front-Panel Insert Removal . . . . . . . . . . . . . . . . . . .6-8
Figure 6-7. Control Panel Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-9
Figure 6-8. Drive Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-10
Figure 6-9. 3.5-Inch Diskette-Drive Assembly Removal . . . . . . . . . . . . .6-11
Figure 6-10. 3.5-Inch Diskette Drive Bracket. . . . . . . . . . . . . . . . . . . . . . .6-12
Figure 6-11. 5.25-Inch Drive Assembly Removal . . . . . . . . . . . . . . . . . . .6-12
Figure 6-12. 5.25-Inch Drive Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . .6-13
Figure 6-13. Hard-Disk Drive Bracket Removal . . . . . . . . . . . . . . . . . . .6-14
Figure 6-14. Hard-Disk Drive Removal . . . . . . . . . . . . . . . . . . . . . . . . . . .6-15

xii
Figure 6-15. System Power-Supply Removal . . . . . . . . . . . . . . . . . . . . . . 6-16
Figure 6-16. Expansion-Card Cage Removal . . . . . . . . . . . . . . . . . . . . . . . 6-17
Figure 6-17. Expansion-Card Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-18
Figure 6-18. Riser Board Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-19
Figure 6-19. System Board Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-20
Figure 6-20. System Board Components . . . . . . . . . . . . . . . . . . . . . . . . . 6-21
Figure 6-21. DIMM Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-22
Figure 6-22. DIMM Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-22
Figure 6-23. Installing a Video-Memory Upgrade Module. . . . . . . . . . . . . 6-23
Figure 6-24. SEC Cartridge/Heat Sink Removal . . . . . . . . . . . . . . . . . . . . 6-24
Figure 6-25. System Battery Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 6-25
Figure 7-1. Internal View of the OptiPlex NX1 Computer . . . . . . . . . . . . . 7-3
Figure 7-2. Optional-Stand Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Figure 7-3. Computer Cover Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . .7-4
Figure 7-4. Service Access Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-5
Figure 7-5. Control Panel Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-6
Figure 7-6. Hard-Disk Drive Removal . . . . . . . . . . . . . . . . . . . . . . . . . . .7-7
Figure 7-7. System Power-Supply Removal . . . . . . . . . . . . . . . . . . . . . . .7-8
Figure 7-8. Expansion-Card Cage Removal . . . . . . . . . . . . . . . . . . . . . . . . 7-9
Figure 7-9. Expansion-Card Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10
Figure 7-10. Riser Board Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-11
Figure 7-11. System Board Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-12
Figure 7-12. System Board Components . . . . . . . . . . . . . . . . . . . . . . . . . 7-13
Figure 7-13. DIMM Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-14
Figure 7-14. DIMM Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-14
Figure 7-15. Installing a Video-Memory Upgrade Module. . . . . . . . . . . . . 7-15
Figure 7-16. SEC Cartridge/Heat Sink Removal . . . . . . . . . . . . . . . . . . . . 7-16
Figure 7-17. System Battery Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 7-17
Figure A-1. System Setup Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-2
Figure A-2. Sample Device List Screen . . . . . . . . . . . . . . . . . . . . . . . . . . .A-8
7DEOHV Table 1-1. System-Board Jumper Descriptions . . . . . . . . . . . . . . . . . . 1-18
Table 1-2. Interrupt Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
Table 1-3. DREQ Line Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
Table 1-4. OptiPlex GX1 DC Voltage Ranges . . . . . . . . . . . . . . . . . . . . 1-22
Table 1-5. OptiPlex NX1 DC Voltage Ranges. . . . . . . . . . . . . . . . . . . . . 1-30
Table 1-6. Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-33
Table 3-1. POST Beep Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Table 3-2. System Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
Table A-1. System Setup Categories . . . . . . . . . . . . . . . . . . . . . . . . . . .A-4

xiii

xiv
5HDG7KLV)LUVW
A prerequisite for using this manualto service Dell computer systems is a basic
knowledge of IBM®-compatible PCs and prior training in IBM-compatible PC
troubleshooting techniques. In addition to information provided in this manual
and the
User’s Guide
that came with the system, Dell provides the
Diagnostics
and Troubleshooting Guide
for troubleshooting procedures and instructions on
using the Dell diagnostics to test the computer system.
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Throughout this manual, there may be blocks of text printed in bold type or in
italic type. These blocks are warnings, cautions, and notes, and they are used
as follows:
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NOTE: A NOTE provides helpful information about using the computer system.

System Overview 1-1
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This manual contains field-servicing information for the Dell®OptiPlex®GX1
Managed PC and OptiPlex NX1 Net PC family of computers. The Dell OptiPlex
GX1 and OptiPlex NX1 systems are high-speed (266-, 333-, 350-, or 400-MHz),
upgradable desktop computers built around high-performance Intel®Pentium®II
microprocessors with MMX™technology.
The OptiPlex GX1 and NX1 systems use a standard system board with optional
integrated NIC controller with Wakeup On LAN capability.
The OptiPlex GX1 systems are available in three different chassis configura-
tions: low-profile desktop, midsize desktop, and mini tower (see Figure 1-1).
The OptiPlex NX1 system is available only in the OptiPlex NX1 chassis (see
Figure 1-1).
Chapters 1 through 3 and Appendix A contain information that applies to all
models of the OptiPlex GX1 and OptiPlex NX1 families; Chapters 4, 5, 6, and 7
are chassis-specific.

1-2
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The three OptiPlex GX1 and the OptiPlex NX1 chassis configurations differ pri-
marily in the following expansion features:
Number of expansion slots available for PCI/ISA expansion cards
Number of available internal drive bays for EIDE/SCSI drives
Number of available external drive bays for diskette, CD-ROM, or tape
drives
Physical size and power supply types (the midsize and mini tower systems
use the same power supply)
Due to the physical differences in the four chassis configurations, a separate
parts removal and replacement chapter (Chapters 4 through 7) is provided for
each chassis type.
Midsize Chassis
Low-Profile Chassis
Mini Tower Chassis
OptiPlex NX1 Chassis

System Overview 1-3
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All four chassis configurations have the following similarities:
The same system board.
Identical operational characteristics (same BIOS, POST, memory,
microprocessor, external I/O ports, and so on).
Identical diagnostics, diagnostic beep codes, and diagnostic-screen error
messages (see Chapters 1 through 3 and Appendix A). However, the
OptiPlex NX1 computer has no built-in diskette drive and requires a special
setup process to run the diskette-based diagnostics as described in Chap-
ter 2.
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The features described in the following subsections are common to all chassis
configurations.
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All systems in the OptiPlex GX1 and OptiPlex NX1 computer families incorpo-
rate the Pentium II microprocessor for improved operating speeds and overall
performance. Some of the major enhancement features of the Pentium II
microprocessor include internal 16-KB data and instruction caches, internal
math coprocessor, and the MMX instruction set for high performance in com-
plex multimedia and communications environments. The Pentium II
microprocessor also uses a technique called single instruction, multiple data
(SIMD), which permits processing data elements in parallel for additional sys-
tem performance enhancement.
The microprocessor is physically located in a single-edge contact (SEC)
cartridge/heat sink assembly on the system board for ease of upgrading when
faster processors are available. Contact Dell Computer Corporation for informa-
tion about Dell-supported microprocessor upgrades.
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For additional performance, the OptiPlex GX1 and OptiPlex NX1 systems
employ a secondary cache memory subsystem with a cache memory control-
ler and 512 KB of pipeline-burst SRAM cache memory. The L2 cache SRAM is
located in the SEC cartridge/heat sink assembly on the system board.
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Main memory for the OptiPlex GX1 and OptiPlex NX1 systems ranges from a
minimum of 32 MB to a maximum of 384 MB. All main memory is
implemented using high-speed ECC and non-ECC DIMMs. One to three
DIMMs, ranging in memory capacity sizes from 32 to 128 MB, may be used to
provide a maximum memory capacity of 384 MB.

1-4
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8SJUDGDEOH%,26LQ)ODVK0HPRU\
The system BIOS is implemented in flash ROM, which allows for easy BIOS
upgrades using diskette files or files downloaded from Dell’s home page on
the World Wide Web (www.dell.com). The BIOS also incorporates the POST
diagnostics, which tests the system each time the system is started.
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The EIDE subsystem implemented on the system board provides two Mode-4,
DMA bus-mastered EIDE interfaces, each of which can support up to two
EIDE devices (for example, CD-ROM drive, hard-disk drive, and so on). The
EIDE controller attaches to the high-speed PCI local bus.
The primary EIDE interface (IDE1) provides support for up to two high-
performance EIDE devices. The computer’s boot drive should be connected to
the primary EIDE interface.
The secondary EIDE interface (IDE2) also provides support for up to two high-
performance EIDE devices, typically EIDE tape drives or CD-ROM drives.
NOTES: Any externally accessible drive bays at the front of the computer are
normally used for diskette, CD-ROM, and/or tape drives. Hard-disk drives
should be installed in the internal hard-disk drive positions described in “Hard-
Disk Drive Service Information” found later in this chapter.
The OptiPlex NX1 system supports only one hard-disk drive and optionally one
external diskette drive for running the diskette-based diagnostics as described
in Chapter 2,“Basic Troubleshooting”.
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As a standard feature, OptiPlex GX1 and OptiPlex NX1 systems are equipped
with Self-Monitoring and Analysis Reporting Technology (SMART), which
warns you at system start-up if your hard-disk drive has become unreliable.
This warning occurs only if you use hard-disk drives with SMART technology.
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The OptiPlex GX1 and OptiPlex NX1 systems are equipped with an integrated
diskette drive controller (PIIX4e) that can support a maximum of two non-EIDE
diskette and tape drives via a 34-pin DSKT connector located on the system
board. The low-profile chassis can accommodate only one external drive device
(diskette drive or tape drive). Other chassis configurations can accommodate
two external drive devices.
NOTES: If the diskette drive and tape drive are both attached to the diskette
drive controller on the system board, only the diskette drive is configured in
the System Setup program as Drive A or Drive B. The tape drive is then listed
as Not Installed (under either the Drive A or Drive B category).

System Overview 1-5
The OptiPlex NX1 system contains an integrated controller and diskette drive
connector but is not equipped with a diskette drive. If you run the diskette-
based diagnostics, this computer requires an external diskette-drive kit as
described in Chapter 2, “Basic Troubleshooting.”
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The OptiPlex GX1 and OptiPlex NX1 systems include an integrated high-
performance 64-bit accelerated graphics port (AGP) subsystem, implemented
on the system board, which drives an external SVGA monitor. The AGP con-
tains a dedicated bus that bypasses the PCI bus and allows for interconnection
of the video subsystem directly to the Pentium chip set for the extra-high per-
formance required for 3D video subsystems. This architecture also off-loads
the PCI bus providing greater performance for devices attached to the PCI bus.
The maximum supported resolution is 1600 x 1200 with 65,535 colors at
75 Hz. The SVGA subsystem consists of the following major components:
ATI Rage Pro (AGP 2X) video controller
4-MB synchronous graphics random-access memory (SGRAM) video
memory (expandable to 8 MB via a video-memory upgrade kit)
15-hole monitor port
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The integrated audio controller is a single chip that connects to the ISA bus.
The audio controller has analog jacks for line-in and microphone input. The
single line-out output jack provides stereo output for a line-level input to an
external amplifier or drives stereo headphones. See “Technical Specifications”
found later in this chapter for audio jack input and output specifications.
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The ATI multimedia channel (AMC) implements a local graphics busthat allows
external devices to attach directly to the graphics controller. The AMC allows
devices to transfer video stream data to the graphics controller, for example,
MPEG-2 decoding for digital video disk (DVD) applications, or to receive video
stream data from the graphics controller to the device, for example, TV-Out
circuitry, or to do both simultaneously. Most of the video stream data trans-
fers occur on the AMC without congesting the PCI bus bandwidth.
The 40-pin AMC connector, shown in Figure 1-12, consists of three ports into
the graphics controller: a digital video stream (DVS) port for video input into the
graphics controller, a multimedia peripheral port (MPP) for video input and out-
put from the graphic controller, and an inter-integrated circuit (I2C)-compatible
serial control port for controlling the attached devices. A fourth port, audio
mixing bus (AMB), is not supported by the system. To route mixed audio from
an AMC-compliant adapter card to the system board, CD-ROM audio cables
must be attached from the adapter card’s CD-ROM audio input and CD-ROM

1-6
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audio output connections to the AMC connector. See the AMC-compliant
adapter card’s documentation for more information.
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The OptiPlex GX1 and OptiPlex NX1 systems include a telephony application
programming interface (TAPI) that allows the system board audio to interface
with a modem to facilitate speakerphone functionality. The TAPI-compliant
telephony input is a mono source with a maximum signal level of 2 Vrms.
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The OptiPlex GX1 systems and OptiPlex NX1 systems provide chassis intru-
sion detection. If the computer cover is removed, the Chassis Intrusion setting
in the System Setup program changes from Not Detected to Detected and the
following message is displayed during the boot routine at system start-up:
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To clear this field and allow future intrusions to be detected, make sure that
the computer cover is closed, and then enter the System Setup program dur-
ing the system’s POST, as described in Appendix A, “System Setup Program.”
Use the left- or right-arrow key to select Reset for the Chassis Intrusion cate-
gory. This action changes the setting to its default, Not Detected.
NOTE: If a setup password has been assigned by someone else, contact your
network administrator for information on resetting the chassis intrusion
detector.
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The OptiPlex GX1 systems and OptiPlex NX1 systems are available with or
without integrated Ethernet NIC subsystem.
The integrated 10/100-Mbps 3Com®PCI 3C905B-TX Ethernet NIC subsystem
supports the Wakeup On LAN feature and the 10BASE-T and 100BASE-T stan-
dards. The NIC subsystem connects to the Ethernet network through a single
RJ45 connector on the back of the computer. The RJ45 connector and the NIC
interface circuitry are mounted on the system board.
The NIC connector on the computer’s back panel has the following indicators:
A yellow
activity indicator
flashes when the system is transmitting or
receiving network data. (A high volume of network traffic may make this
indicator appear to be in a steady “on” state.)
A green
link integrity indicator
lights up when there is a good connection
between the network and the NIC. When the green indicator is off, the sys-
tem is not detecting a physical connection to the network.

System Overview 1-7
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The computer’s NIC connector (RJ45) is designed for attaching to an
unshielded twisted pair (UTP) Ethernet cable. The other end of the cable con-
nects to an RJ45 jack wall plate or to an RJ45 port on a UTP concentrator or
hub, depending on the network configuration.
Chapter 4,“Using Integrated Devices,” in the
Reference and Installation Guide
provides instructions for connecting the computer to, and configuring it for use
on, an Ethernet network. For OptiPlex NX1 systems, refer to the online
Net-
work Administrator’s Guide.
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For desktop connectivity, the OptiPlex GX1 and OptiPlex NX1 systems include
the following ports:
25-hole, bidirectional parallel port with EPP/ECP and demand-mode DMA
support
Two Universal Serial Bus (USB) ports
Two 9-pin serial ports
Two PS/2 ports (mouse and keyboard)
One 15-hole video connector
Three audio jacks (microphone, line-in, and line-out)
One RJ45 Ethernet NIC connector
See Figures 1-3 through 1-6 for I/O port identifiers for the various chassis
configurations.
836
The OptiPlex GX1 and OptiPlex NX1 systems are equipped with a switch-
selectable (115/230-VAC) UPS that can operate from standard AC power
outlets in the U.S. and all international countries. The power supply used in the
midsize and mini tower chassis configurations is a higher-capacity power sup-
ply than that used in the low-profile and OptiPlex NX1 chassis configurations.
Dell OptiPlex GX1 and OptiPlex NX1 systems have a special power supply that
provides trickle (“flea”) power to support the Wakeup On LAN feature when
computer power is off.
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Figure 1-2 shows the front-panel features for the four chassis types;
Figures 1-3 through 1-6 show internal features of the four chassis types.

1-8
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diskette-drive
access indicator
reset button hard-disk drive
access indicator
power button power indicator
diskette-drive
access indicator
reset button
hard-disk drive
access indicator
power button power indicator
power indicator
hard-disk drive
access indicator
power button
reset button
Mini Tower Chassis
OptiPlex NX1 Chassis
hard-disk drive
access indicator
power button
power
indicator
Midsize Chassis
Low-Profile Chassis