Dell OptiPlex G1 User manual

ZZZGHOOFRP

'HOO2SWL3OH[*
0DQDJHG3&6\VWHPV
6(59,&(0$18$/

____________________
Information in this document is subject to change without notice.
© 1994–1998 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 OptiPlex are registered trademarks of Dell Computer Corporation; MS-DOS ,
Microsoft , and Windows are registered trademarks of Microsoft Corporation; Intel and Pentium are registered trademarks and MMX
isatrademark of Intel Corporation;
IBM isaregisteredtrademark of InternationalBusinessMachinesCorporation; 3Com isaregistered
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.
May 1998 P/N 6562C

v
&RQWHQWV
&KDSWHU 6\VWHP2YHUYLHZ  
Chassis Differences. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Chassis Similarities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Standard Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Pentium II Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Secondary L2 Cache . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Main Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Upgradable BIOS in Flash Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
EIDE Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
SMART Technology. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Integrated Diskette/Tape Drive Controller . . . . . . . . . . . . . . . . . . . . . . . 1-4
Integrated SVGA Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
ATI Multimedia Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Chassis Intrusion Detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Integrated Ethernet NIC Support (Optional). . . . . . . . . . . . . . . . . . . . . . 1-5
Network Cable Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Full Set of I/O Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Location of Major Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Component Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
Advanced Expansion Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
Low-Profile Computer’s Expansion-Card Slots . . . . . . . . . . . . . . . . . . 1-12
Midsize Computer’s Expansion-Card Slots . . . . . . . . . . . . . . . . . . . . . 1-12
Mini Tower Computer’s Expansion-Card Slots . . . . . . . . . . . . . . . . . . 1-13
Upgrade Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
Microprocessor/L2 Cache Upgrades . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
Main Memory Expansion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
Video-Memory Upgrade Option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
Computer Service Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
Remote Management Support Features (Optional). . . . . . . . . . . . . . . 1-15
Online Documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
System Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15

vi
System-Board Service Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
System Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
System Board Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
Interrupt Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
DMA Channel Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
Hard-Disk Drive Service Information . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
Hard-Disk Drive for the Low-Profile Computer . . . . . . . . . . . . . . . 1-20
Hard-Disk Drive for the Midsize Computer . . . . . . . . . . . . . . . . . . 1-20
Hard-Disk Drive for the Mini Tower Computer . . . . . . . . . . . . . . . 1-20
Power-Supply Service Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
Pin Assignments for the DC Power Connectors . . . . . . . . . . . . . . 1-22
DC Power Distribution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23
Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28
&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
Getting Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
&KDSWHU %HHS&RGHVDQG(UURU0HVVDJHV 
POST Beep Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
System Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
&KDSWHU 5HPRYLQJDQG5HSODFLQJ3DUWVRQWKH
/RZ3URILOH&KDVVLV  
Recommended Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Precautionary Measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Inside the Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Using the Optional Stand for Vertical Orientation . . . . . . . . . . . . . . . . . . . . 4-4
Computer Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Eject, Power, and Reset Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
Front-Panel Inserts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
Drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Externally Accessible Drive Assemblies . . . . . . . . . . . . . . . . . . . . . . . 4-10
3.5-Inch Diskette Drive Assembly . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

vii
5.25-Inch Drive Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
Hard-Disk Drive Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
System Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13
Expansion Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
Expansion-Card Cage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
Expansion Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15
Riser Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
System Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17
System Board Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18
DIMMs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18
Video Memory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19
Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21
SEC Cartridge/Heat Sink Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21
System Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-22
&KDSWHU 5HPRYLQJDQG5HSODFLQJ3DUWVRQWKH
0LGVL]H&KDVVLV  
Recommended Tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Precautionary Measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Inside the Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
Using the Optional Stand for Vertical Orientation . . . . . . . . . . . . . . . . . . . . 5-3
Computer Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
Eject, Power, and Reset Buttons. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Front-Panel Inserts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
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

viii
&KDSWHU 5HPRYLQJDQG5HSODFLQJ3DUWVRQWKH
0LQL7RZHU&KDVVLV 
Recommended Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Precautionary Measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Inside the Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
Computer Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
Front Bezel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
Eject, Power, and Reset Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
Front-Panel Inserts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
Drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9
Externally Accessible Drive Assemblies . . . . . . . . . . . . . . . . . . . . . . . . 6-9
3.5-Inch Diskette Drive Assembly . . . . . . . . . . . . . . . . . . . . . . . . . 6-10
5.25-Inch Drive Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11
Hard-Disk Drive Bracket. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13
Hard-Disk Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14
System Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-15
Expansion Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16
Expansion-Card Cage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16
Expansion Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-17
Riser Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-18
System Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-19
System Board Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-20
DIMMs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-21
Video Memory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-22
Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-23
SEC Cartridge/Heat Sink Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . 6-23
System Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-24
$SSHQGL[$ 6\VWHP6HWXS3URJUDP  $
System Setup Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
,QGH[
)LJXUHV Figure 1-1. Chassis Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Figure 1-2. Front-Panel Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Figure 1-3. Internal View of the Low-Profile Chassis . . . . . . . . . . . . . . . 1-8
Figure 1-4. Internal View of the Midsize Chassis . . . . . . . . . . . . . . . . . . 1-9
Figure 1-5. Internal View of the Mini Tower Chassis . . . . . . . . . . . . . . 1-10
Figure 1-6. Computer Orientation Information . . . . . . . . . . . . . . . . . . . 1-11
Figure 1-7. Riser Board for the Low-Profile Computer . . . . . . . . . . . . . 1-12

ix
Figure 1-8. Riser Board for the Midsize Computer (Option 1). . . . . . . . 1-13
Figure 1-9. Riser Board for the Midsize Computer (Option 2). . . . . . . . 1-13
Figure 1-10. Riser Board for the Mini Tower Computer . . . . . . . . . . . . . 1-14
Figure 1-11. System Board Components . . . . . . . . . . . . . . . . . . . . . . . . 1-16
Figure 1-12. System Board Jumpers. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
Figure 1-13. DC Power Connector P1. . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
Figure 1-14. DC Power Connectors P2 (Midsize and
Mini Tower Chassis); P3, P4, P5, P6, and P9
(All OptiPlex G1 Chassis). . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
Figure 1-15. DC Power Connectors P2 (Low-Profile Chassis) and P7
(All OptiPlex G1 Chassis). . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23
Figure 1-16. DC Power Cables for the Low-Profile Computer . . . . . . . . 1-23
Figure 1-17. DC Power Distribution for the Low-Profile Computer. . . . . 1-24
Figure 1-18. DC Power Cables for the Midsize and
Mini Tower Computers . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
Figure 1-19. DC Power Distribution for the Midsize Computer. . . . . . . . 1-26
Figure 1-20. DC Power Distribution for the Mini Tower Computer. . . . . 1-27
Figure 4-1. Internal View of the Low-Profile Computer. . . . . . . . . . . . . . 4-3
Figure 4-2. Attaching the Optional Stand for Vertical Orientation . . . . . . 4-4
Figure 4-3. Computer Cover Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Figure 4-4. Eject, Power, and Reset Button Removal. . . . . . . . . . . . . . . 4-6
Figure 4-5. Front-Panel Insert Removal . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Figure 4-6. Control Panel Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
Figure 4-7. Drive Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Figure 4-8. 3.5-Inch Diskette Drive Removal. . . . . . . . . . . . . . . . . . . . . 4-10
Figure 4-9. 5.25-Inch Drive Assembly Removal . . . . . . . . . . . . . . . . . . 4-11
Figure 4-10. Hard-Disk Drive Assembly Removal . . . . . . . . . . . . . . . . . 4-12
Figure 4-11. System Power-Supply Removal . . . . . . . . . . . . . . . . . . . . . 4-13
Figure 4-12. Expansion-Card Cage Removal . . . . . . . . . . . . . . . . . . . . . . 4-14
Figure 4-13. Expansion-Card Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15
Figure 4-14. Riser Board Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
Figure 4-15. System Board Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17
Figure 4-16. System Board Components . . . . . . . . . . . . . . . . . . . . . . . . 4-18
Figure 4-17. DIMM Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19
Figure 4-18. DIMM Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19
Figure 4-19. Installing a Video-Memory Upgrade Module. . . . . . . . . . . . 4-19
Figure 4-20. SEC Cartridge/Heat Sink Removal. . . . . . . . . . . . . . . . . . . . 4-21
Figure 4-21. System Battery Installation . . . . . . . . . . . . . . . . . . . . . . . . . 4-22
Figure 5-1. Internal View of the Midsize Computer. . . . . . . . . . . . . . . . . 5-3
Figure 5-2. Attaching the Optional Stand for Vertical Orientation . . . . . . 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

x
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. Control Panel Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
Figure 6-7. Drive Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9
Figure 6-8. 3.5-Inch Diskette-Drive Assembly Removal . . . . . . . . . . . . 6-10
Figure 6-9. 3.5-Inch Diskette Drive Bracket . . . . . . . . . . . . . . . . . . . . . 6-11
Figure 6-10. 5.25-Inch Drive Assembly Removal . . . . . . . . . . . . . . . . . . 6-11
Figure 6-11. 5.25-Inch Drive Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12
Figure 6-12. Hard-Disk Drive Bracket Removal . . . . . . . . . . . . . . . . . . . 6-13
Figure 6-13. Hard-Disk Drive Removal . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14
Figure 6-14. System Power-Supply Removal . . . . . . . . . . . . . . . . . . . . . 6-15
Figure 6-15. Expansion-Card Cage Removal . . . . . . . . . . . . . . . . . . . . . . 6-16
Figure 6-16. Expansion-Card Removal . . . . . . . . . . . . . . . . . . . . . . . . . . 6-17
Figure 6-17. Riser Board Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-18
Figure 6-18. System Board Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-19
Figure 6-19. System Board Components . . . . . . . . . . . . . . . . . . . . . . . . 6-20
Figure 6-20. DIMM Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-21
Figure 6-21. DIMM Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-21

xi
Figure 6-22. Installing a Video-Memory Upgrade Module. . . . . . . . . . . . 6-22
Figure 6-23. SEC Cartridge/Heat Sink Removal. . . . . . . . . . . . . . . . . . . . 6-23
Figure 6-24. System Battery Installation . . . . . . . . . . . . . . . . . . . . . . . . . 6-24
Figure A-1. System Setup Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
7DEOHV Table 1-1. System-Board Jumper Descriptions . . . . . . . . . . . . . . . . . . .1-17
Table 1-2. Interrupt Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
Table 1-3. DREQ Line Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
Table 1-4. OptiPlex G1 DC Voltage Ranges . . . . . . . . . . . . . . . . . . . . 1-21
Table 1-5. Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28
Table 3-1. POST Beep Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Table 3-2. System Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Table A-1. System Setup Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3

xii
5HDG7KLV)LUVW
A prerequisite for using this manual to service Dell computer systems is a basic
knowledge of IBM®-compatible PCs and prior training in IBM-compatible PC
troubleshooting techniques. In addition to information provided in this manual
and the
User’s Guide
that came with the system, Dell provides the
Diagnostics
and Troubleshooting Guide
for troubleshooting procedures and instructions on
using the Dell diagnostics to test the computer system.
:DUQLQJV&DXWLRQVDQG1RWHV
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:
:$51,1*$:$51,1*LQGLFDWHVWKHSRWHQWLDOIRUERGLO\KDUPDQG
SURYLGHVLQVWUXFWLRQVIRUKRZWRDYRLGWKHSUREOHP
&$87,21$&$87,21LQGLFDWHVHLWKHUSRWHQWLDOGDPDJHWRKDUG
ZDUHRUORVVRIGDWDDQGSURYLGHVLQVWUXFWLRQVIRUKRZWRDYRLGWKH
SUREOHP
NOTE: A NOTE provides helpful information about using the computer system.

System Overview 1-1
&+$37(5
6\VWHP2YHUYLHZ
This manual contains field-servicing information for the Dell®OptiPlex®G1
Managed PC family of computers. The Dell OptiPlex G1 systems are high-
speed (266-, 300-, 333-, 350-, or 400-MHz), upgradable desktop computers
built around high-performance Intel®Pentium®II microprocessors with
MMX™technology.
The OptiPlex G1 systems use a Dell-designed system board with an optional
integrated NIC controller with Wakeup On LAN capability.
The OptiPlex G1 systems are available in three different chassis configurations:
low-profile desktop, midsize desktop, and mini tower (see Figure 1-1).
Chapters 1 through 3 and Appendix A contain information that applies to all
models of the OptiPlex G1 family; Chapters 4, 5, and 6 are chassis-specific.
)LJXUH&KDVVLV&RQILJXUDWLRQV
Midsize Chassis
Low-Profile Chassis
Mini Tower Chassis

1-2 Dell OptiPlex G1 Managed PC Systems Service Manual
&KDVVLV'LIIHUHQFHV
The three OptiPlex G1 chassis configurations differ primarily in the following
expansion features:
Number of expansion slots available for PCI/ISA expansion cards
Number of available internal drive bays for EIDE 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 three chassis configurations, a separate
parts removal and replacement chapter (Chapters 4 through 6) is provided for
each chassis type.
&KDVVLV6LPLODULWLHV
All three chassis configurations have the following similarities:
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)
6WDQGDUG)HDWXUHV
The features described in the following subsections are common to all chassis
configurations.
3HQWLXP,,0LFURSURFHVVRU
All OptiPlex G1 systems incorporate 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 instruc-
tion set for high performance in complex multimedia and communications
environments. The Pentium II microprocessor also uses a technique called
“single instruction, multiple data” (SIMD), which permits processing data ele-
ments in parallel for additional system 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 become available. Contact Dell Computer Corporation for
information about Dell-supported microprocessor upgrades.

System Overview 1-3
6HFRQGDU\/&DFKH
For additional performance, the OptiPlex G1 systems employ a secondary
cache memory subsystem with a cache memory controller 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.
0DLQ0HPRU\
Main memory for the OptiPlex G1 systems ranges from a minimum of 32 MB
to a maximum of 256 MB. All main memory is implemented using high-speed
non-ECC DIMMs. One or two DIMMs, ranging in memory capacity sizes from
32 to 128 MB, may be used to provide a maximum memory capacity of
256 MB.
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.
(,'(6XEV\VWHP
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.
NOTE: The 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.
60$577HFKQRORJ\
As a standard feature, OptiPlex G1 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.

1-4 Dell OptiPlex G1 Managed PC Systems Service Manual
,QWHJUDWHG'LVNHWWH7DSH'ULYH&RQWUROOHU
The OptiPlex G1 systems are equipped with an integrated diskette/tape 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.
NOTE: 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).
,QWHJUDWHG69*$6XEV\VWHP
The OptiPlex G1 systems include an integrated high-performance 64-bit base-
line accelerated graphics port (AGP) subsystem, implemented on the system
board, which drives an external SVGA monitor. The AGP contains a dedicated
bus that bypasses the PCI bus and allows for interconnection of the video sub-
system directly to the Pentium II chip set for the extra-high performance
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 resolutions include 1600 x 1200 pixels with 256 col-
ors noninterlaced and 1024 x 768 pixels with 65,536 colors noninterlaced. The
SVGA subsystem consists of the following major components:
ATI Rage II C (baseline AGP 1X) video controller
2-MB synchronous graphics random-access memory (SGRAM) video
memory (expandable to 4 MB using a video-memory upgrade kit)
15-hole monitor port
$7,0XOWLPHGLD&KDQQHO
The ATI multimedia channel (AMC) implements a local graphicsbus that 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), receive video
stream data from the graphics controller (for example, TV-Out circuitry), or do
both simultaneously. Most of the video stream data transfers occur on the
AMC without congesting the PCI bus bandwidth.
The 40-pin AMC connector, shown in Figure 1-11, 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 mix-
ing 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

System Overview 1-5
be attached from the adapter card’s CD-ROM audio input and CD-ROM audio
output connections to the AMC connector. See the AMC-compliant adapter
card’s documentation for more information.
&KDVVLV,QWUXVLRQ'HWHFWLRQ
The OptiPlex G1 systems provide chassis intrusion 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 dis-
played during the boot routine at system start-up:
$OHUW&RYHUZDVSUHYLRXVO\UHPRYHG
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.
,QWHJUDWHG(WKHUQHW1,&6XSSRUW2SWLRQDO
The OptiPlex G1 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-TX
standards. 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.
1HWZRUN&DEOH5HTXLUHPHQWV
The computer’s NIC connector (RJ45) is designed for attaching to a UTP Ether-
net cable. The other end of the cable connects to an RJ45 jack wall plate or to
an RJ45 port on a UTP concentrator or hub, depending on the network
configuration.

1-6 Dell OptiPlex G1 Managed PC Systems Service Manual
Chapter 4,“Using Integrated Devices,” inthe
Reference and Installation Guide
provides instructions for connecting the computer to, and configuring it for use
on, an Ethernet network.
)XOO6HWRI,23RUWV
For desktop connectivity, the OptiPlex G1 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
One RJ45 Ethernet NIC connector (optional)
See Figures 1-3 through 1-5 for I/O port identifiers for the various chassis
configurations.
3RZHU6XSSO\
The OptiPlex G1 systems are equipped with a switch-selectable (115-/230-VAC)
power supply 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 model than that used in the
low-profile chassis configuration.
Dell OptiPlex G1 systems have a special power supply that provides trickle
(“flea”) power to support the Wakeup On LAN feature when computer power
is off.

System Overview 1-7
/RFDWLRQRI0DMRU&RPSRQHQWV
Figure 1-2 shows the front-panel features for the three chassis types;
Figures 1-3 through 1-5 show internal features of the three chassis types.
)LJXUH)URQW3DQHO)HDWXUHV
diskette-drive
access indicator
reset button hard-disk drive
access indicator
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
Midsize Chassis
Low-Profile Chassis
diskette-drive
removable
media device
diskette-drive
removable
media device
diskette-drive
access indicator
diskette-drive
removable
media device
power button

1-8 Dell OptiPlex G1 Managed PC Systems Service Manual
)LJXUH,QWHUQDO9LHZRIWKH/RZ3URILOH&KDVVLV
serial port 1
connector
power supply
voltage selection
switch
AC power
receptacle
3.5-inch diskette drive
expansion-card
cage
USB connectors (2)
keyboard
connector
video connector
expansion-card slots (3)
hard-disk drive
serial port 2 connector
hard-disk drive
interface cable
diskette/tape drive
interface cable
parallel port
connector
NIC connector (optional)
mouse
connector
padlock ring
security cable slot
chassis
intrusion
switch

System Overview 1-9

)LJXUH,QWHUQDO9LHZRIWKH0LGVL]H&KDVVLV
NIC connector (optional)
parallel port
connector
power supply
voltage
selection
switch
AC power
receptacle
serial port 1
connector
USB connectors (2)
keyboard connector
mouse connector
drive cage
diskette/tape drive interface cable
hard-disk drive
bracket
hard-disk drive
interface cable
3.5-inch diskette drive
expansion-card cage
expansion-card slots (5)
video connector
serial port 2 connector
security cable slot
padlock ring
chassis
intrusion
switch

1-10 Dell OptiPlex G1 Managed PC Systems Service Manual
)LJXUH,QWHUQDO9LHZRIWKH0LQL7RZHU&KDVVLV
power
security
cable slot
serial port 2
connector
AC power
receptacle
parallel port
connector
USB connectors (2)
mouse
connector
keyboard
connector
serial port 1
connector
video connector
padlock ring
system board
expansion-card
cage
riser board
hard-disk drive
bracket
external
drive bays
interface cable
NIC connector (optional)
chassisintrusion
switch
voltage
selection
switch