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Chassis Differences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Chassis Similarities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Standard Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Secondary L2 Cache . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Main Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
EIDE Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
SMART Technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Full Set of I/O Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Upgrade Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
Computer Service Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
System Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
v
Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-35
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
Connecting an External Diskette Drive to the
Getting Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
POST Beep Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
System Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
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Recommended Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Precautionary Measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
vi
Inside the Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Computer Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Eject, Power, and Reset Buttons. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Front-Panel Inserts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Drives. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
System Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
Expansion Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13
Expansion-Card Cage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13
Expansion Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
Riser Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15
System Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
DIMMs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17
Video Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18
Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19
System Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-20
5HPRYLQJꢀDQGꢀ5HSODFLQJꢀ3DUWVꢀRQꢀWKHꢀ
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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
Drives. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
Hard-Disk Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13
System Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14
vii
Expansion Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15
Expansion-Card Cage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15
Expansion Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-16
Riser Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-17
System Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-18
DIMMs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-19
Video Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-20
Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-21
System Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-22
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Recommended Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Precautionary Measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Inside the Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Computer Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
Front Bezel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
Front-Panel Inserts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9
Drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10
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
DIMMs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-21
Video Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-22
Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-23
System Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-24
viii
5HPRYLQJꢀDQGꢀ5HSODFLQJꢀ3DUWVꢀRQꢀWKHꢀ
2SWL3OH[ꢀ1;ꢁꢀ1HWꢀ3&ꢀ&KDVVLV ꢀꢂꢀꢂꢀꢂꢀꢂꢀꢂꢀꢂꢀꢂꢀꢂꢀꢂꢀꢂꢀꢂꢀꢂꢀꢂꢀꢂꢀꢂꢀꢂꢀꢂ ꢉꢃꢁ
Recommended Tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Precautionary Measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
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
DIMMs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-13
Video Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-14
Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-15
System Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-16
System Setup Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
Device List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6
)LJXUHV
ix
Figure 1-17. DC Power Connectors P2 (Midsize and
(All OptiPlex GX1/GX1p Chassis). . . . . . . . . . . . . . . . . . . . . 1-26
Figure 1-18. DC Power Connectors P2 (Low-Profile Chassis)
Figure 1-21. DC Power Cables for the Midsize and
Figure 1-24. DC Power Connector P1 for the
Figure 1-25. DC Power Connector P2 for the
Figure 1-26. DC Power Connector P3 for the
Figure 1-27. DC Power Cables for the OptiPlex
Figure 1-28. DC Power Distribution for the OptiPlex
Figure 2-1.
Connecting an External Diskette Drive to the
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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.
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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:
:$51,1*ꢀꢁꢁ$ꢁ:$51,1*ꢁLQGLFDWHVꢁWKHꢁSRWHQWLDOꢁIRUꢁERGLO\ꢁKDUPꢁDQGꢁ
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NOTE: A NOTE provides helpful information about using the computer system.
xiv
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®
®
This manual contains field-servicing information for the Dell OptiPlex GX1/
GX1p Managed PC and OptiPlex NX1 Net PC family of computers. The Dell Opti-
Plex GX1/GX1p and OptiPlex NX1 systems are high-speed (266-, 333-, 350-, 400-
or 450-MHz), upgradable desktop computers built around high-performance
®
®
™
Intel Pentium II microprocessors with MMX technology. The OptiPlex GX1p
systems are available only with 400-MHz or 450-MHz processors.
The OptiPlex GX1/GX1p 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 GX1p is available only in the midsize desktop and mini tower
chassis. 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/GX1p and OptiPlex NX1 families; Chapters 4, 5, 6,
and 7 are chassis-specific.
System Overview
1-1
Low -Profile Chassis
Midsize Chassis
Mini Tower Chassis
OptiPlex NX1 Chassis
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The four different chassis configurations differ primarily in the following expan-
sion 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.
1-2
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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 Chapter 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/GX1p and OptiPlex NX1 computer families
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 instruction 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 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/GX1p 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.
System Overview
1-3
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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. Main memory for the OptiPlex
GX1p system ranges from a minimum of 128 MB to a maximum of 384 MB. All
main memory for the OptiPlex GX1 and OptiPlex NX1 systems is implemented
using high-speed error checking and correction (ECC) and non-ECC DIMMs. All
main memory for the OptiPlex GX1p system is implemented using high-speed
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.
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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 (w w w.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”.
60$57ꢀ7HFKQRORJ\
As a standard feature, OptiPlex GX1/GX1p 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.
1-4
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,QWHJUDWHGꢀ'LVNHWWHꢋ7DSHꢀ'ULYHꢀ&RQWUROOHU
The OptiPlex GX1/GX1p and OptiPlex NX1 systems are equipped with an inte-
grated 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 Diskette Drive A or Diskette Drive B. The tape
drive is then listed as Not Installed (under either the Diskette Drive A or
Diskette Drive B option).
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/GX1p and OptiPlex NX1 systems include an integrated
high-performance 64-bit accelerated graphics port (AGP) subsystem, imple-
mented on the system board, which drives an external SVGA monitor. The
AGP contains a dedicated bus that bypasses the PCI bus and allows for inter-
connection of the video subsystem directly to the Pentium 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 resolution is 1600 x 1200 with 65,535 colors at
75 Hz. The SVGA subsystem consists of the following major components:
‡ ATI RAGE PRO TURBO video controller
‡ 4-MB synchronous graphics random-access memory (SGRAM) video
memory (expandable to 8 MB via a video-memory upgrade kit); 8 MB stan-
dard on the GX1p
‡ 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.
System Overview
1-5
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The ATI multimedia channel (AMC) implements a local graphics bus 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, 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-
2
put from the graphic controller, and an inter-integrated circuit (I C)-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
audio output connections to the AMC connector. See the AMC-compliant
adapter card’s documentation for more information.
7HOHSKRQ\ꢀ$SSOLFDWLRQꢀ3URJUDPPLQJꢀ,QWHUIDFH
The OptiPlex GX1/GX1p and OptiPlex NX1 systems include a telephony appli-
cation 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.
&KDVVLVꢀ,QWUXVLRQꢀ'HWHFWLRQ
Chassis Intrusion displays the status of the system chassis intrusion monitor.
The settings for this option are Enabled, Enabled-Silent, or Disabled. The
default is Enabled.
If the computer cover is removed while the intrusion monitor is set to
Enabled, the setting changes to Detected, and the following message
appears during the boot sequence at the next system start-up:
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If the computer cover is removed while the intrusion monitor is set to
Enabled-Silent, the setting changes to Detected, but the alert message is not
displayed during the boot sequence at the next system start-up.
If the intrusion monitor is set to Disabled, no intrusion monitoring occurs and
no messages are displayed.
To reset the Detected setting, enter the System Setup program during the
system’s POST. Highlight the Chassis Intrusion option and press the left- or
right-arrow key to choose Enabled, Enabled-Silent, or Disabled.
NOTE: If a setup password has been assigned by someone else, contact your
network administrator for information on resetting the chassis intrusion detector.
1-6
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,QWHJUDWHGꢀ(WKHUQHWꢀ1,&ꢀ6XSSRUWꢀꢌ2SWLRQDOꢍ
The OptiPlex GX1 systems and OptiPlex NX1 systems are available with or
without an integrated Ethernet NIC subsystem. The OptiPlex GX1p systems
are available only with an 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
system is not detecting a physical connection to the network.
1HWZRUNꢀ&DEOHꢀ5HTXLUHPHQWV
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/GX1p 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.
System Overview
1-7
3RZHUꢀ6XSSO\
The OptiPlex GX1/GX1p and OptiPlex NX1 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
power supply than that used in the low-profile and OptiPlex NX1 chassis
configurations.
Dell OptiPlex GX1/GX1p and OptiPlex NX1 systems have a special power sup-
ply 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
power button
power indicator
reset button
hard-disk drive
access indicator
Low-Profile Chassis
diskette-drive
access indicator
power button
hard-disk drive
power indicator
reset button
access indicator
Midsize Chassis
diskette-drive
access indicator
power indicator
power button
reset button
hard-disk drive
access indicator
Mini Tower Chassis
power button
power
indicator
hard-disk drive
access indicator
OptiPlex NX1 Chassis
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System Overview
1-9
3.5-inch diskette drive
diskette/tape drive
interface cable
power supply
hard-disk drive
interface cable
padlock ring
hard-disk drive
voltage selection
switch
chassis
intrusion
switch
AC power
receptacle
parallel port
connector
expansion-card
cage
serial port 1
connector
mouse
connector
expansion-card slots (3)
keyboard
connector
audio connectors (3)
USB connectors (2)
serial port 2 connector
NIC connector (optional)
video connector
security cable slot
)LJXUHꢀꢁꢃꢅꢂꢀꢀ,QWHUQDOꢀ9LHZꢀRIꢀWKHꢀ/RZꢃ3URILOHꢀ&KDVVLV
1-10
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ꢀ
drive cage
diskette/tape drive interface cable
power supply
AC power
receptacle
voltage
selection
switch
parallel port
connector
serial port 1
connector
mouse connector
keyboard connector
USB connectors (2)
NIC connector (optional)
)LJXUHꢀꢁꢃꢆꢂꢀꢀ,QWHUQDOꢀ9LHZꢀRIꢀWKHꢀ0LGVL]Hꢀ&KDVVLV
System Overview
1-11
AC power
receptacle
power supply
security
cable slot
parallel port
connector
external
drive bays
serial port 1
connector
keyboard
connector
mouse
connector
hard-disk drive
bracket
interface cable
USB connectors (2)
serial port 2
connector
chassis intrusion
switch
video connector
expansion-card
cage
NIC connector (optional)
system board
audio connectors (3)
riser board
padlock ring
)LJXUHꢀꢁꢃꢇꢂꢀꢀ,QWHUQDOꢀ9LHZꢀRIꢀWKHꢀ0LQLꢀ7RZHUꢀ&KDVVLV
1-12
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chassis
intrusion
switch
power supply
DC power cable
EIDE cable
padlock ring
security
access lock
parallel port
connector
serial port 1
connector
hard-disk drive
mouse
connector
expansion-card cage
keyboard
connector
expansion-card slot
AC power receptacle
audio connectors (3)
NIC connector (optional)
video connector
USB connectors (2)
security
cable slot
serial port 2 connector
)LJXUHꢀꢁꢃꢈꢂꢀꢀ,QWHUQDOꢀ9LHZꢀRIꢀWKHꢀ2SWL3OH[ꢀ1;ꢁꢀ&KDVVLV
$GYDQFHGꢀ([SDQVLRQꢀ)HDWXUHVꢀ
The OptiPlex GX1/GX1p systems contain advanced expansion subsystems
that can support a mixture of traditional ISA expansion cards (called legacy
cards), Plug and Play ISA expansion cards, and PCI expansion cards.
For non-Plug and Play operating system environments, an ISA Configuration
Utility (ICU) included with the computer provides a means of avoiding
resource conflicts. Chapter 3, “Using the ISA Configuration Utility,” in the Ref-
erence and Installation Guide describes the ICU and provides instructions for
using it to configure the computer.
®
®
In the Microsoft Windows 98 operating system, the functions provided by
the ICU are handled by the Device Manager, which can be accessed by
double-clicking the System icon in the Control Panel. See your Windows 98
documentation for instructions on using the Device Manager to manage
resources and resolve conflicts.
System Overview
1-13
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The OptiPlex NX1 computer has one PCI expansion-card connector on the riser
board (see Figure 1-7). The computer automatically assigns any required mem-
ory space, IRQ lines, and DMA channels to an installed PCI expansion card
during system start-up. The Wakeup On LAN power connector on the riser
board supports an optional NIC expansion card with Wakeup On LAN capabil-
ity. The power LED lights up when DC power is applied to the riser board.
power LED
PCI1 connector
Wakeup On LAN
power connector
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/RZꢃ3URILOHꢀ&RPSXWHU·Vꢀ([SDQVLRQꢃ&DUGꢀ6ORWVꢀ
The OptiPlex GX1 low-profile computers have three expansion-card slots.
The riser board has two ISA expansion-card connectors and two PCI
expansion-card connectors. One PCI expansion-card connector and one ISA
expansion-card connector share a single expansion-card slot, resulting in a
total of three expansion-card slots (see Figure 1-8). The low-profile computers
have a passive riser board, with no PCI-to-PCI bridge. The riser board includes
the P1 connector (for connecting the NIC to the riser board cable) and an LED
(see Figure 1-8). If the LED is on, the riser board is receiving power; if off, the
riser board is not receiving power.
P1 connector
LED
ISA1
connector
ISA2 connector
PCI2
connector
HDLED
connector
PCI1
connector
)LJXUHꢀꢁꢃꢎꢂꢀꢀ5LVHUꢀ%RDUGꢀIRUꢀWKHꢀ/RZꢃ3URILOHꢀ&RPSXWHU
0LGVL]Hꢀ&RPSXWHU·Vꢀ([SDQVLRQꢃ&DUGꢀ6ORWVꢀꢀꢀꢀ
The OptiPlex GX1/GX1p midsize computers have five expansion-card slots.
The riser board for the GX1 is offered in two options. The GX1p uses the
option 2 riser board. Option 1 is a passive riser board, with no PCI-to-PCI
bridge. Option 1 has three 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, resulting in a
1-14
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total of five expansion-card slots (see Figure 1-9). Option 2 is an active riser
board, with a PCI-to-PCI bridge. Option 2 has two ISA expansion-card connec-
tors and five PCI expansion-card connectors. Two PCI/ISA expansion-card
connector pairs each share an expansion-card slot, again resulting in a total of
five expansion-card slots (see Figure 1-10). Both riser board options include the
P1 connector (for connecting the NIC to the riser board cable) and an LED. If
the LED is on, the riser board is receiving power; if off, the riser board is not
receiving power.
ISA3
connector
ISA2
connector
LED
ISA1
connector
HDLED
connector
PCI3
connector
P1 connector
PCI2
connector
PCI1
connector
)LJXUHꢀꢁꢃꢏꢂꢀꢀ5LVHUꢀ%RDUGꢀIRUꢀWKHꢀ0LGVL]Hꢀ&RPSXWHUꢀꢌ2SWLRQꢀꢁꢍ
PCI5 connector
LED
ISA2
connector
PCI4
connector
ISA1
connector
PCI3
connector
HDLED
connector
P1 connector
PCI2
connector
PCI1
connector
)LJXUHꢀꢁꢃꢁꢐꢂꢀꢀ5LVHUꢀ%RDUGꢀIRUꢀWKHꢀ0LGVL]Hꢀ&RPSXWHUꢀꢌ2SWLRQꢀꢄꢍ
System Overview
1-15
0LQLꢀ7RZHUꢀ&RPSXWHU·Vꢀ([SDQVLRQꢃ&DUGꢀ6ORWVꢀꢀꢀꢀ
The OptiPlex GX1/GX1p mini tower computers have seven expansion-card
slots. The riser board has four ISA expansion-card connectors and five PCI
expansion-card connectors. Two PCI expansion-card connectors share
expansion-card slots with two ISA connectors, resulting in a total of seven
expansion-card slots (see Figure 1-11). The riser board is active, incorporating
PCI-to-PCI bridging.
The mini tower riser board includes the P1 connector (for connecting the NIC
to the riser board cable) and an LED. If the LED is on, the riser board is receiv-
ing power; if off, the riser board is not receiving power.
ISA4
LED
PCI5
PCI4
ISA3
ISA2
ISA1
PCI3
P1 connector
PCI2
HDLED
connector
PCI1
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8SJUDGHꢀ2SWLRQV
The system board has various accommodations for system upgrades
including:
‡ Microprocessor upgrade
‡ Main memory expansion
‡ Video memory expansion
These upgrades are summarized in the following subsections, and installation
procedures are provided for the various chassis configurations in Chapters 4, 5,
6, and 7.
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On the OptiPlex GX1/GX1p and OptiPlex NX1 systems, the microprocessor
and secondary L2 cache memory are implemented in an SEC cartridge/heat
sink assembly. Upgrade to a higher-performance microprocessor is accom-
plished by snapping out the old assembly and installing an upgrade assembly
as higher-performance microprocessors become available.
1-16
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0DLQꢀ0HPRU\ꢀ([SDQVLRQ
The three DIMM sockets on the system board can accommodate combina-
tions of 32-, 64-, and 128-MB DIMMs up to a total memory capacity of
384 MB. Main memory can have either 72-bit parity (ECC) DIMMs or 64-bit
nonparity DIMMs.
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On the OptiPlex GX1 and OptiPlex NX1 systems, you can upgrade video mem-
ory from 4 to 8 MB by installing an optional video-memory upgrade module in
the video-memory upgrade socket on the system board. Adding video memory
increases the system’s video performance and provides additional modes for
high-resolution/expanded color applications. The OptiPlex GX1p system comes
with 8 MB standard.
NOTE: See the online System User’s Guide or Chapter 6, “Installing System
Board Options,” in the Reference and Installation Guide for additional upgrade
information.
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The following subsections provide service-related information about the com-
puter. Unless otherwise specified, the information applies to all chassis
configurations.
2QOLQHꢀ'RFXPHQWDWLRQ
Dell OptiPlex GX1/GX1p computers are shipped with an online System User’s
Guide (located in the Dell Accessories folder) that provides additional hard-
ware and software installation, configuration information, and Dell contact
information.
System Overview
1-17
6\VWHPꢀ'LDJQRVWLFV
Server-based and diskette-based diagnostics are available to aid in troubleshoot-
ing all major components of the OptiPlex GX1 and GX1p. The OptiPlex NX1
systems use server-based diagnostics, hard-disk–based diagnostics, or the
diskette-based diagnostics using an external diskette-drive kit connected directly
to the system board. See “Running the System Diagnostics” in Chapter 2 for
additional information.
6\VWHPꢃ%RDUGꢀ6HUYLFHꢀ'DWD
The following subsections provide service-related information about the sys-
tem board and components.
6\VWHPꢀ%RDUGꢀ
The OptiPlex GX1p, and newer versions of the GX1 and OptiPlex NX1 systems
use the system board shown in Figure 1-12 (integrated NIC is optional on the
GX1 and NX1). Older versions of the OptiPlex GX1 and OtiPlex NX1 systems
use the system board shown in Figure 1-13.
3.3-V power
input connector
(POWER_2)
DIMM sockets (3)
(DIMM_A–DIMM_C)
battery socket
(BATTERY)
telephony
connector
(TAPI)
parallel/serial port 1
connectors (stacked)
(PARALLEL/SERIAL1)
control panel
connector (PANEL)
mouse/keyboard
connectors (stacked)
(MOUSE/KYBD)
chassis intrusion
switch connector
USB connectors
(USB) (2)
main power input
connector (POWER_1)
serial port 2
connector
(SERIAL2)
SEC cartridge connector
(SLOT1)
front of com puter
microprocessor
fan connector (FAN)
video-memory
upgrade socket
(VIDEO_UPGRADE)
CD-in
connectors (CD-IN)
primary EIDE
interface connector
(IDE1)
video
connector MONITOR)
optional
integrated NIC
connector (ENET)
secondary EIDE
interface connector
(IDE2)
microphone jack (MIC)
diskette/tape drive
interface connector
(DSKT)
audio line-out
jack (LINE-OUT)
ATI multimedia
connector (AMC)
riser board connector (RISER)
audio line-in
jack (LINE-IN)
system board jumpers
)LJXUHꢀꢁꢃꢁꢄꢂꢀꢀ6\VWHPꢀ%RDUGꢀ&RPSRQHQWVꢀꢌ1HZꢍ
1-18
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optional NIC
connector
(ENET)
microphone
jack (MIC)
serial port 2
connector (SERIAL2)
microprocessor
fan connector
(FAN)
mouse/keyboard
connectors
(stacked)
video connector
(MONITOR)
line-out jack
(LINE-OUT)
USB connectors (2)
(USB)
(MOUSE/KYBD)
line-in jack
(LINE-IN)
parallel/serial port 1
connectors (stacked)
(PARALLEL/SERIAL1)
CD-ROM audio
interface
telephony
connector (CD_IN)
connector (TAPI)
video-memory
upgrade socket
(VIDEO_UPGRADE)
SEC cartridge connector
(SLOT1)
ATI multimedia
connector (AMC)
DIMM sockets (3)
(DIMM_A–DIMM_C)
riser board
connector (RISER)
main power input
connector(POWER_1)
secondary EIDE
interface
connector (IDE2)
3.3-V power input
connector
(POWER_2)
battery socket
(BATTERY)
system board
jumpers
primary EIDE
interface connector interface connector
(IDE1)
diskette/tape drive
chassis intrusion switch
connector (INTRUSION)
(DSKT)
control panel
connector (PANEL)
front of com puter
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System Overview
1-19
6\VWHPꢀ%RDUGꢀ-XPSHUV
The system board jumpers are located in the same corner on both the old and
new system board.
unjumpered
jumpered
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6HWWLQJV
500MHZ*
Microprocessor
speed
Install jumper if the microprocessor’s
internal speed is 500 MHz; otherwise, the
jumper should not be installed.
450MHZ*
400MHZ*
Microprocessor
speed
Install jumper if the microprocessor’s
internal speed is 450 MHz; otherwise, the
jumper should not be installed.
Microprocessor
speed
Install jumper if the microprocessor’s
internal speed is 400 MHz; otherwise, the
jumper should not be installed.
*
One set of speed jumpers must have a jumper plug installed; otherwise, the system
defaults to 350 MHz.
1-20
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-XPSHU
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6HWWLQJV
350MHZ*
Microprocessor
speed
Install jumper if the microprocessor’s
internal speed is 350 MHz; otherwise, the
jumper should not be installed.
333MHZ*
Microprocessor
speed
Install jumper if the microprocessor’s
internal speed is 333 MHz; otherwise, the
jumper should not be installed.
300MHZ*
266MHZ*
Microprocessor
speed
Reserved. Jumper not installed (default).
Microprocessor
speed
Install jumper if the microprocessor’s
internal speed is 266 MHz; otherwise, the
jumper should not be installed.
BUS66M
External system
clock
Install jumper to set the external system
clock speed at 66 MHz; otherwise, the
external system clock speed operates at
100 MHz (default).
BIOS
Reserved
Password
Jumper not installed (default).
PSWD
Install to enable the password feature
enable or disable (default).
*
One set of speed jumpers must have a jumper plug installed; otherwise, the system
defaults to 350 MHz.
,QWHUUXSWꢀ$VVLJQPHQWV
7DEOHꢀꢁꢃꢄꢂꢀꢀ,QWHUUXSWꢀ$VVLJQPHQWV
,54ꢁ/LQH
IRQ0
8VHGꢁ%\ꢄ$YDLODEOH
Generated by system timer.
Generated by keyboard controller.
IRQ1
IRQ2
Generated internally by interrupt controller to enable IRQ8
through IRQ15.
IRQ3
IRQ4
Generated by super I/O controller to indicate that the device con-
nected to the serial port (COM2 or COM4) requires service.
Generated by super I/O controller to indicate that the device con-
nected to the serial port (COM1 or COM3) requires service.
IRQ5
IRQ6
Available for use by an expansion card.
Generated by super I/O controller to indicate that diskette or tape
drive requires service.
IRQ7
IRQ8
Generated by super I/O controller to indicate that device con-
nected to parallel port requires service.
Generated by RTC alarm event.
System Overview
1-21
7DEOHꢀꢁꢃꢄꢂꢀꢀ,QWHUUXSWꢀ$VVLJQPHQWVꢀꢁFRQWLQXHGꢂ
,54ꢁ/LQH
8VHGꢁ%\ꢄ$YDLODEOH
IRQ9
Available for use by an expansion card, except in ACPI-enabled
configurations.
IRQ10
IRQ11*
IRQ12
Available for use by an expansion card.
NIC/default PCI IRQ.
Generated by keyboard controller to indicate that mouse’s output
buffer is full.
IRQ13
IRQ14
Generated by math coprocessor to indicate coprocessor error.
Generated by device connected to primary EIDE port to indicate
that device requires service. If the EIDE controller is disabled,
this line is available for other use.
IRQ15
Generated by device connected to secondary EIDE port to
indicate that device requires service. If the EIDE controller is
disabled, this line is available for other use.
*
If an ISA expansion card is configured for IRQ11, the optional NIC or PCI IRQ is assigned
to another available IRQ line.
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7DEOHꢀꢁꢃꢅꢂꢀꢀ'5(4ꢀ/LQHꢀ$VVLJQPHQWV
'5(4ꢁ/LQH
DREQ0
DREQ1
DREQ2
8VHGꢁ%\ꢄ$YDLODEOH
Available
Available
Generated by super I/O controller to initiate DMA cycle for
attached diskette drive
DREQ3
DREQ4
Available
Generated by bus controller chip to activate second DMA
controller
DREQ5
DREQ6
DREQ7
Available
Available
Available
NOTE: The built-in audio controller, NIC (optional), and video controllers are assigned available
DMA channels automatically during system start-up.
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The following subsections provide service-related information about hard-disk
drive options for the OptiPlex GX1/GX1p, and OptiPlex NX1 computers.
NOTE: Throughout this manual, references to component locations assume
the chassis orientations illustrated in Figure 1-15.
1-22
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back
back
left
side
right
side
left
side
right
side
front
front
OptiPlex NX1 Chassis
Low-Profile Chassis
back
top
right
side
left
side
back
front
bottom
front
Mini Tower Chassis
Midsize Chassis
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+DUGꢃ'LVNꢀ'ULYHꢀIRUꢀWKHꢀ/RZꢃ3URILOHꢀ&RPSXWHU
The hard-disk drive assembly (consisting of the hard-disk drive and the hard-
disk drive bracket) is located inside the chassis at the left front of the computer
and is attached to the bottom of the chassis. One 1-inch-high EIDE or SCSI
hard-disk drive can be mounted on the hard-disk drive bracket.
+DUGꢃ'LVNꢀ'ULYHꢀIRUꢀWKHꢀ0LGVL]Hꢀ&RPSXWHU
The hard-disk drive bracket is located next to the externally accessible drive
bays at the front of the computer. The hard-disk drive bracket can contain
either one or two 1-inch-high EIDE or SCSI hard-disk drives, or one 1-inch-high
EIDE or SCSI hard-disk drive and one 1.6-inch-high EIDE or SCSI hard-disk
drive.
System Overview
1-23
+DUGꢃ'LVNꢀ'ULYHꢀIRUꢀWKHꢀ0LQLꢀ7RZHUꢀ&RPSXWHU
The hard-disk drive bracket is located beneath the externally accessible drive
bays at the front of the computer. The hard-disk drive bracket can contain
either one or two 1-inch-high EIDE or SCSI hard-disk drives, or one 1-inch-high
EIDE or SCSI hard-disk drive and one 1.6-inch-high EIDE or SCSI hard-disk
drive.
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One 1-inch-high EIDE hard-disk drive can be mounted to the top of the
expansion-card cage.
3RZHUꢃ6XSSO\ꢀ6HUYLFHꢀ'DWD
The low-profile computers have a 145-W system power supply, the midsize
computers have a 200-W system power supply, and the mini tower computers
have a 230-W power supply. All system power supplies can operate from an
AC power source of 115 VAC at 50 to 60 Hz or 230 VAC at 50 to 60 Hz.
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SRZHUꢁVXSSO\ꢁDVVHPEO\ꢅꢁPXVWꢁEHꢁVHWꢁWRꢁWKHꢁFRUUHFWꢁRSHUDWLQJꢁYROWDJHꢁ
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RXWOHWꢂ
The system power supply provides the DC operating voltages and currents
listed in Table 1-4.
NOTE: The power supply produces DC voltages only under its loaded condi-
tion. Therefore, when you measure these voltages, the DC power input
connectors must be connected to their corresponding power input connectors
on the system board or drives.
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5DQJH
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12.0 A1 (low-profile computers);
14.0 A1 (midsize and mini tower
computers)
+3.3 VDC
+3.15 to +3.45 VDC
18.0 A1 (low-profile computers);
22.0 A1 (midsize and mini tower
computers)
+5 VDC
+4.75 to +5.25 VDC
+11.40 to +12.60 VDC
3.0 A2 (low-profile computers);
6.0 A2 (midsize and mini tower
computers)
+12 VDC
1
The combined load on the +5-VDC and +3.3-VDC outputs should not exceed 105 W on
the low-profile computers or 140 W on the midsize/mini tower computers.
2
Withstands surges of up to 11.0 A to support disk start-up operations.
1-24
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7DEOHꢀꢁꢃꢆꢂꢀꢀ2SWL3OH[ꢀ*;ꢁꢋ*;ꢁSꢀ'&ꢀ9ROWDJHꢀ5DQJHVꢀꢁFRQWLQXHGꢂ
9ROWDJH
5DQJH
0D[LPXPꢁ2XWSXWꢁ&XUUHQW
–12 VDC
–10.80 to –13.20 VDC
0.3 A (low-profile computers);
0.3 A (midsize and mini tower
computers)
–5 VDC
–4.50 to –5.50 VDC
0.3 A (low-profile computers);
0.3 A (midsize and mini tower
computers)
+5 VFP3
+4.75 to +5.25 VDC
10 mA
3
VFP (volts flea power) — sometimes called “standby power.”
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The power-supply output voltages can be measured at the back (wire side) of
the connectors without disconnecting them. Figures 1-15 through 1-17 show
the wire side of the connectors.
–5 VDC (white)
+5 VDC (red)
common (black)
common (black)
common (black)
+5 VDC (red)
+5 VDC (red)
2
TFSC (brown)
1
PSON# (gray)
+5 VDC (red)
11
12 13 14 15 16 17 18 19 20
3ꢀ
1
2
3
4
5
6
7
8
9
10
common (black)
common (black)
+5 VDC (red)
common (black)
+5 VDC (red)
–12 VDC (blue)
+12 VDC (yellow)
+5 VFP (purple)
common (black)
3
PWRGOOD (orange)
1
2
3
Pin 11 — PSON# should measure between +4 and +5 VDC except when the power button
on the front panel is pressed, taking PSON# to its active-low state.
Pin 19 — Thermal fan-speed control (TFSC) is a power-supply input signal used to control
the power-supply fan speed.
Pin 5 — PWRGOOD should measure between +4 and +5 VDC when the power supply is on
and operating to indicate that all power-supply output voltages are within ranges specified
in Table 1-4.
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System Overview
1-25
P2, P3, P5, P6, P9
P4
1
2
3
4
1
2
3
4
+12 VDC (yellow)
common (black)
+5 VDC (red)
common (black)
common (black)
+12 VDC (yellow)
common (black)
+5 VDC (red)
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&KDVVLVꢍꢑꢀ3ꢅꢊꢀ3ꢆꢊꢀ3ꢇꢊꢀ3ꢈꢊꢀDQGꢀ3ꢏꢀꢌ$OOꢀ2SWL3OH[ꢀ*;ꢁꢋ*;ꢁSꢀ&KDVVLVꢍ
P2, P7
1
2
3
4
5
6
+3.3 VDC (blue/white)
+3.3 VDC (blue/white)
+3.3 VDC (blue/white)
common (black)
common (black)
common (black)
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ꢌ$OOꢀ2SWL3OH[ꢀ*;ꢁꢋ*;ꢁSꢀ&KDVVLVꢍ
'&ꢀ3RZHUꢀ'LVWULEXWLRQ
Figures 1-19 through 1-23 provide the following information about DC power
distribution:
‡ Power-supply connector identification
‡ Power cable connections for diskette, tape, CD-ROM, and hard-disk drives
‡ Power distribution to sockets and connectors on the system board
1-26
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1-28
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system board
battery
keyboard
controller
+3 VDC
riser board
+3.3 VDC
power
RTC/
management
and NIC logic
NVRAM
PCI1
through
PCI3
+5 VDC
+12 VDC
–12 VDC
P1
POWER1
PWRGOOD
PSON#
+5 VFP
+5 VDC
–5 VDC
+12 VDC
–12 VDC
PSON#
+5 VFP
+5 VDC
–5 VDC
+12 VDC
–12 VDC
+5 VFP
P1
system
power supply
+5 VDC
–5 VDC
+12 VDC
–12 VDC
+5 VDC
–5 VDC
+12 VDC
–12 VDC
ISA1
through
ISA3
RISER
P7
POWER2
+3.3 VDC
+12 VDC
FAN
main
memory
sockets
+5 VFP
+5 VDC
P2
P3
P4
internal
hard-disk drive
PANEL
DIMM_A
DIMM_B
DIMM_C
+5 VDC
+5 VDC
USB
internal
hard-disk drive
fuses (2)
KYBD
3.5-inch
diskette drive
+5 VDC
MOUSE
*
P5
MICROPROCESSOR
+3.3 VDC
processor
core regulator
optional
drive
NOTE: +5 VFP is routed to
the integrated NIC logic on
the system board and to P1
on the riser board.
*
P6
core VCC +2.1 to +3.5 VDC
optional
drive
*
Some computers have an additional connector (P9) that may be used instead of P5 or P6.
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1-30
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ꢀ
keyboard
controller
system board
battery
+3 VDC
riser board
+3.3 VDC
power
management
and NIC logic
RTC/
NVRAM
PCI1
through
PCI5
+5 VDC
+12 VDC
–12 VDC
P1
POWER1
PWRGOOD
PSON#
+5 VFP
+5 VDC
–5 VDC
+12 VDC
–12 VDC
PSON#
+5 VFP
+5 VDC
–5 VDC
+12 VDC
–12 VDC
+5 VFP
P1
system
power supply
+5 VDC
–5 VDC
+12 VDC
–12 VDC
ISA1
through
ISA4
+5 VDC
–5 VDC
+12 VDC
–12 VDC
RISER
P7
POWER2
+3.3 VDC
+12 VDC
FAN
main
memory
sockets
+5 VFP
+5 VDC
P2
P3
P4
internal
hard-disk drive
PANEL
DIMM_A
DIMM_B
+5 VDC
+5 VDC
USB
internal
hard-disk drive
DIMM_C
KYBD
3.5-inch
diskette drive
+5 VDC
MOUSE
P5
P6
processor
core regulator
optional
drive
MICROPROCESSOR
+3.3 VDC
core VCC +2.1 to +3.5 VDC
NOTE: +5 VFP is routed to
the integrated NIC logic on
the system board and to P1
on the riser board.
optional
drive
P9
optional
drive
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6\VWHPꢀ3RZHUꢀ6XSSO\ꢀIRUꢀWKHꢀ2SWL3OH[ꢀ1;ꢁꢀ
&RPSXWHUꢀ
The OptiPlex NX1 computers have an 80-W computer power supply. The
power supply can operate from an AC power source of 115 VAC at 60 Hz or
230 VAC at 50 Hz. The system power supply provides the DC operating volt-
ages and currents listed in Table 1-5.
NOTE: The power supply produces DC voltages only under its loaded condi-
tion. Therefore, when you measure these voltages, the DC power input
connectors must be connected to their corresponding power input connectors
on the system board and hard-disk drive.
System Overview
1-31
.
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1
9ROWDJH
5DQJH
0D[LPXPꢁ2XWSXWꢁ&XUUHQW
6.0 A1
+3.3 VDC
+5 VDC
+12 VDC
–12 VDC
+3.14 to +3.47 VDC
+4.75 to +5.25 VDC
+11.40 to +12.60 VDC
12.0 A1
1.0 A 2
0.5 A
1.2 A
–10.80 to –13.20 VDC
+4.75 to +5.25 VDC
+5 VFP3
1
The combined load on the +5-VDC and +3.3-VDC outputs should not exceed 65 W.
Withstands surges of up to 3.0 A to support disk start-up operations.
VFP (volts flea power) — sometimes called “standby power.”
2
3
2SWL3OH[ꢀ1;ꢄꢀ3LQꢀ$VVLJQPHQWVꢀIRUꢀWKHꢀ'&ꢀ3RZHUꢀ&RQQHFWRUVꢀ
The power-supply output voltages can be measured at the back (wire side) of
the connectors without disconnecting them. Figures 1-24 through 1-26 show
the wire side of the connectors.
open
+5 VDC (red)
+5 VDC (red)
+5 VDC (red)
common (black)
common (black)
common (black)
2
TFSC (brown)
1
PSON# (gray)
+5 VDC (red)
11
12 13 14 15 16 17 18 19 20
3ꢀ
1
2
3
4
5
6
7
8
9
10
+5 VDC (red)
common (black)
+5 VDC (red)
common (black)
common (black)
–12 VDC (blue)
+12 VDC (yellow)
+5 VFP (purple)
common (black)
3
PWRGOOD (orange)
1
2
3
Pin 11 — PSON# should measure between +4 and +5 VDC except when the power button
on the front panel is pressed, taking PSON# to its active-low state.
Pin 19 — Thermal fan-speed control (TFSC) is a power-supply input signal used to control
the power-supply fan speed.
Pin 5 — PWRGOOD should measure between +4 and +5 VDC when the power supply is
on to indicate that all power-supply output voltages are within the ranges specified in
Table 1-5.
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1-32
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P2
1
2
3
4
5
6
+3.3 VDC (blue/white)
+3.3 VDC (blue/white)
+3.3 VDC (blue/white)
common (black)
common (black)
common (black)
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P3
1
2
3
4
+5 VDC (red)
common (black)
common (black)
+12 VDC (yellow)
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Figures 1-27 and 1-28 provide the following information about DC power
distribution:
‡ Power-supply connector identification
‡ Power cable connection for the hard-disk drive
‡ Power distribution to sockets and connectors on the system board
P3
P2
P1
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System Overview
1-33
system board
battery
+3 VDC
RTC/
power
management
and NIC logic
NVRAM
P1 POWER_1
PWRGOOD
PSON#
+5 VFP
PSON#
+5 VFP
P1
system
power supply
+3.3 VDC
+5 VDC
+12 VDC
–12 VDC
+3.3 VDC
+5 VDC
+12 VDC
–12 VDC
+5 VDC
+12 VDC
–12 VDC
+5 VDC
+12 VDC
–12 VDC
PCI1
RISER
POWER_2
P2
riser board
+3.3 VDC
+12 VDC
FAN
main memory
sockets
+5 VFP
+5 VDC
PANEL
USB
DIMM_A
+5 VDC
+5 VDC
+5 VDC
P3
DIMM_B
DIMM_C
internal
hard-disk drive
fuses (2)
KYBD
MOUSE
processor
core regulator
MICROPROCESSOR
+3.3 VDC
NOTE: +5 VFP is routed to
the integrated NIC logic on
the system board and to P1
on the riser board.
core VCC +2.1 to +3.5 VDC
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1-34
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z
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Microprocessor type . . . . . .
Microprocessor speed . . . . .
Intel Pentium II microprocessor with MMX
technology
266, 333, 350, 400, or 450 MHz (the GX1p
is only available in 400 or 450 MHz)
External system clock . . . . .
Internal cache. . . . . . . . . . . .
66/100 MHz
32-KB (16-KB data cache and 16-KB instruc-
tion cache)
Math coprocessor . . . . . . . .
internal to the microprocessor
6\VWHPꢁ,QIRUPDWLRQ
System chip set . . . . . . . . . .
Data bus width. . . . . . . . . . .
Address bus width . . . . . . . .
DMA channels . . . . . . . . . . .
Interrupt levels . . . . . . . . . . .
Flash EPROM (BIOS) . . . . . .
Intel 440BX AGPSet chip set
64 bits
32 bits
seven
15
2 Mb
([SDQVLRQꢁ%XV
Bus types . . . . . . . . . . . . . . .
Bus speeds . . . . . . . . . . . . .
PCI and ISA (PCI bus complies with PCI
Specification 2.1)
PCI: 33 MHz; ISA: 8.33 MHz
PCI expansion-card
connectors:
Low-profile
computers . . . . . . . . . . . .
two (one PCI connector and one ISA
connector share an expansion-card slot)
Midsize computers . . . .
three (one PCI connector and one ISA
connector share an expansion-card slot)
or
five (two share expansion-card slots)
Mini tower
computers . . . . . . . . . . . .
five (two PCI connectors share expansion-
card slots with ISA connectors)
OptiPlex NX1
computers . . . . . . . . . . .
one
System Overview
1-35
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([SDQVLRQꢁ%XVꢀꢁFRQWLQXHGꢂ
ISA expansion-card
connectors:
Low-profile
computers . . . . . . . . . . .
two (one ISA connector and one PCI
connector share an expansion-card slot)
Midsize computers . . . .
three (one ISA connector and one PCI
connector share an expansion-card slot)
or
two (both share expansion-card slots)
Mini tower
computers . . . . . . . . . . . .
four (two ISA connectors share expansion-
card slots with PCI connectors)
OptiPlex NX1
computers . . . . . . . . . . .
none
1,&
NIC. . . . . . . . . . . . . . . . . . . .
integrated 3Com PCI 3C905B-TX Wakeup
On LAN NIC, operating at 10 or 100 Mbps
(optional on GX1 and NX1)
0HPRU\
Architecture . . . . . . . . . . . . .
64-bit (nonparity) or 72-bit (parity), non-
interleaved on GX1 and NX1; 72-bit (parity),
noninterleaved on GX1p
DIMM sockets . . . . . . . . . . .
DIMM capacities . . . . . . . . .
three (gold contacts)
32-MB nonparity SDRAM;
32-, 64-, and 128-MB parity SDRAM
Standard RAM . . . . . . . . . . .
Maximum RAM . . . . . . . . . .
L2 cache memory . . . . . . . .
32 MB (GX1 and NX1) or 128 MB (GX1p)
384 MB
512-MB pipeline-burst, four-way
set-associative, write-back SRAM
BIOS address . . . . . . . . . . . .
ROM address. . . . . . . . . . . .
F0000h
C8000h
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Externally accessible bays:
Low-profile
computers . . . . . . . . . . .
one 3.5-inch bay for a 3.5-inch diskette
drive; one 5.25-inch bay for a diskette, tape,
or CD-ROM drive
Midsize computers . . . .
one 3.5-inch bay for a 3.5-inch diskette
drive; two 5.25-inch bays for diskette, tape,
or CD-ROM drives
1-36
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'ULYHVꢁꢁFRQWLQXHGꢂ
Mini tower
computers . . . . . . . . . . .
one 3.5-inch bay for a 3.5-inch diskette
drive; three 5.25-inch bays for diskette,
tape, or CD-ROM drives
OptiPlex NX1
computers . . . . . . . . . . .
none
Internal hard-disk drive bays:
Low-profile
computers . . . . . . . . . . . .
one bay for a 1-inch-high EIDE or SCSI hard-
disk drive
Midsize computers . . . .
two bays for either one or two 1-inch-high
EIDE or SCSI hard-disk drives, or one
1-inch-high EIDE or SCSI hard-disk drive and
one 1.6-inch-high EIDE or SCSI hard-disk
drive
Mini tower
computers . . . . . . . . . . . .
two bays for either one or two 1-inch-high
EIDE or SCSI hard-disk drives, or one
1-inch-high EIDE or SCSI hard-disk drive and
one 1.6-inch-high EIDE or SCSI hard-disk
drive
OptiPlex NX1
computers . . . . . . . . . . .
one bay for a 1-inch-high EIDE hard-disk
drive
9LGHR
Video type . . . . . . . . . . . . . .
Video memory . . . . . . . . . . .
integrated ATI RAGE PRO TURBO graphics
4-MB SGRAM, upgradable to 8 MB on the
GX1 and NX1; 8 MB standard on the GX1p
Video resolutions . . . . . . . . .
640 x 480 (32 bpp), True-color, 85 Hz,
minimum 4 MB video memory required;
800 x 600 (32 bpp), True-color, 85 Hz,
minimum 4 MB video memory required;
1024 x 768 (32 bpp), True-color, 85 Hz,
minimum 4 MB video memory required;
1280 x 1024 (32 bpp), True-color, 75 Hz,
minimum 8 MB video memory required;
1600 x 1200 (16 bpp), 65535 colors, 75 Hz,
minimum 8 MB video memory required
System Overview
1-37
3RUWV
Externally accessible:
Serial (DTE) . . . . . . . . . .
Parallel . . . . . . . . . . . . . .
Video . . . . . . . . . . . . . . .
PS/2-style keyboard . . . .
two 9-pin connectors (16550-compatible)
one 25-hole connector (bidirectional)
one 15-hole connector
6-pin mini-DIN
PS/2-compatible
mouse . . . . . . . . . . . . . .
6-pin mini-DIN
NIC. . . . . . . . . . . . . . . . .
USB . . . . . . . . . . . . . . . .
Audio line-in . . . . . . . . . .
Audio microphone . . . . .
Audio line-out . . . . . . . . .
RJ45 connector (optional)
two USB host connectors
2.0-V rms (maximum); stereo
89-mV rms (maximum); mono
1.4-V rms (maximum); stereo (at 32 ohms
minimum impedance)
Internally accessible:
EIDE hard-disk drive . . . .
Diskette drive . . . . . . . . .
two 40-pin connectors on PCI local bus
34-pin connector
CD-ROM drive audio
interface . . . . . . . . . . . .
4-pin connector
40-pin connector
ATI Multimedia
Channel (AMC). . . . . . . .
1-38
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&RQWUROVꢁDQGꢁ,QGLFDWRUV
Reset control . . . . . . . . . . . .
Power control. . . . . . . . . . . .
Power indicator . . . . . . . . . .
push button
push button
green LED in normal operation; flashing
green LED in sleep state
Diskette-drive access
indicator . . . . . . . . . . . . . . . .
green LED
green LED
Hard-disk drive access
indicator . . . . . . . . . . . . . . . .
Link integrity indicator
(on systems with NIC
connector) . . . . . . . . . . . . . .
green LED
Activity indicator
(on systems with NIC
connector) . . . . . . . . . . . . . .
yellow LED
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Power supply wattage:
Low-profile
computers . . . . . . . . . . . .
145 W
200 W
Midsize computers . . . .
Mini tower
computers . . . . . . . . . . . .
200 W
80 W
OptiPlex NX1
computers . . . . . . . . . . .
Power-supply heat dissipation:
Low-profile
computers . . . . . . . . . . . .
808 BTU (nominal)
913 BTU (nominal)
Midsize computers . . . .
Mini tower
computers . . . . . . . . . . . .
913 BTU (nominal)
OptiPlex NX1
computers . . . . . . . . . . .
400 BTU (nominal)
Power supply voltage . . . . . .
Backup battery . . . . . . . . . . .
90 to 135 V at 60 Hz; 180 to 265 V at 50 Hz
3-V CR2032 coin cell
System Overview
1-39
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3K\VLFDOꢁ
Low-profile computers:
Height . . . . . . . . . . . . . .
Width . . . . . . . . . . . . . . .
Depth . . . . . . . . . . . . . . .
Weight (minimum) . . . . .
Midsize computers:
10.9 cm (4.3 inches)
40.89 cm (16.1 inches)
43.69 cm (17.2 inches)
10.89 kg (24.0 lb)
Height . . . . . . . . . . . . . .
Width . . . . . . . . . . . . . . .
Depth . . . . . . . . . . . . . . .
Weight (minimum) . . . . .
Mini tower computers:
Height . . . . . . . . . . . . . .
Width . . . . . . . . . . . . . . .
Depth . . . . . . . . . . . . . . .
Weight (minimum) . . . . .
OptiPlex NX1 computers:
Height . . . . . . . . . . . . . .
Width . . . . . . . . . . . . . . .
Depth . . . . . . . . . . . . . . .
Weight . . . . . . . . . . . . . .
16.5 cm (6.5 inches)
41.9 cm (16.5 inches)
44.5 cm (17.5 inches)
12.7 kg (28.0 lb)
44.4 cm (17.5 inches)
20.6 cm (8.1 inches)
43.7 cm (17.2 inches)
14.9 kg (33.0 lb)
9.27 cm (3.65 inches)
33.71 cm (13.27 inches)
34.93 cm (13.75 inches)
5.9 kg (13.0 lb)
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Temperature:
10° to 35°C* (50° to 95°F)
Operating . . . . . . . . . . . .
Storage . . . . . . . . . . . . .
Relative humidity . . . . . .
Maximum vibration:
Operating . . . . . . . . . . . .
–40° to 65°C (–40° to 149°F)
20% to 80% (noncondensing)
0.25 G at 3 to 200 Hz at 1 octave/min
0.5 G at 3 to 200 Hz at 1 octave/min
Storage . . . . . . . . . . . . .
*
The maximum operating temperature of 35°C (95°F) is for altitudes below 914.6 m
(3000 ft). Above 914.6 m (3000 ft) the maximum operating temperature is reduced.
1-40
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Maximum shock:
Operating . . . . . . . . . . . .
left side (for low-profile, midsize, and Opti-
Plex NX1 computers operating in a vertical
orientation) and bottom half-sine pulse with
a change in velocity of 20 inches/sec
(50.8 cm/sec)
Storage . . . . . . . . . . . . .
Altitude:
27-G faired square wave with a velocity
change of 200 inches/sec (508 cm/sec)
Operating . . . . . . . . . . . .
Storage . . . . . . . . . . . . .
–16 to 3048 m * (–50 to 10,000 ft)
–16 to 10,600 m (–50 to 35,000 ft)
*
The maximum operating temperature of 35°C (95°F) is for altitudes below 914.6 m
(3000 ft). Above 914.6 m (3000 ft) the maximum operating temperature is reduced.
System Overview
1-41
1-42
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This chapter provides basic troubleshooting procedures applicable to all
systems of the Dell OptiPlex GX1/GX1p Managed PC and OptiPlex NX1 Net
PC families. A brief explanation of how to load and start the system diagnos-
tics is also provided at the end of the chapter. Dell recommends that you
perform the following procedures in the order they are presented in this man-
ual. Chapter 3, “Beep Codes and Error Messages,” also contains information
to assist you in diagnosing computer failures that occur during the POST.
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When you first contact a user who has a problem, ask the user to describe the
problem and the conditions under which it occurs. In particular, was the user
installing new hardware or software when the failure occurred? A verbal
description can often indicate the cause of a problem or indicate the appropri-
ate troubleshooting 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 System User’s Guide for infor-
mation 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
Basic Troubleshooting
2-1
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The 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 power sources.
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. For a serial mouse, the
mouse interface cable must be firmly attached to one of the serial port
connectors, and its captive screws must be secure enough to ensure a
firm connection.
4. Verify that any devices attached to the serial and parallel port connectors
are properly connected.
Each of the serial and parallel port interface cables 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. Verify that the video interface cable is firmly attached to the video connec-
tor on the back of the computer and to the connector on the back of the
monitor.
For proper connection of the video monitor, see the documentation for the
monitor.
6. Inspect all external monitor controls for any obvious damage or improper
settings.
For proper settings of the video monitor controls, see the documentation
for the monitor.
7. 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.
8. Inspect the exterior of the computer, including all controls and indicators,
and all user-accessible data storage devices for any signs of physical
damage.
2-2
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Does the inspection reveal any problems?
Yes. Refer to the parts removal and replacement procedure in Chapters 4,
5, 6, or 7, as appropriate for your system.
No. Proceed to the next section, “Observing the Boot Routine.”
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After you have performed an external visual inspection as described in the
previous section, you should boot the system and, while the boot routine is
running, observe the system for any indications of problems.
NOTE: Most of the steps in this procedure require observation of system
functions and indications, some of which can occur simultaneously. It may be
necessary to reboot the system 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 Dell Diagnostics Diskette into drive A. Turn on all
peripherals and the computer. If the computer is already on, press the
reset button or <Ctrl><Alt><Del> to reboot the system.
2. Check the power supply fan.
Does the fan run normally?
Yes. Proceed to step 3.
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?
Yes. Proceed to step 4.
No. Troubleshoot the system power supply. If the troubleshooting pro-
cedure indicates that the system power supply is operational, troubleshoot
the system board.
4. During the boot routine, observe the system 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,
troubleshoot the diskette drive or hard-disk drive subsystem, as
appropriate.
Basic Troubleshooting
2-3
‡ System error messages: These messages can indicate problems or
provide status information. If a system error message is displayed, see
Table 3-2.
‡ Beep codes: A beep code is a series of beeps that indicates an error
condition. If the system emits a beep code, see Table 3-1.
5. Observe the monitor screen for the Diagnostics Menu.
Does the Diagnostics Menu appear?
Yes. See “Running the System Diagnostics” found later in this chapter.
No. Proceed to step 6.
6. Insert another copy of the Dell Diagnostics Diskette into the diskette drive,
and reboot the system.
Does the Diagnostics Menu appear?
Yes. See “Running the System Diagnostics” found later in this chapter.
No. 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 Figures 1-3
through 1-6 as appropriate for your system for component location information.
To perform the internal visual inspection, follow these steps:
1. Turn off the system, including any attached peripherals, and disconnect all
the AC power cables from their power sources.
2. Remove the computer cover.
3. Verify that all chips, DIMMs, and expansion cards are fully seated in their
sockets or connectors.
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XVHꢁDꢁZULVWꢁJURXQGLQJꢁVWUDSꢁRUꢁPDLQWDLQꢁFRQWDFWꢁZLWKꢁDꢁPHWDOꢁVXUꢃ
IDFHꢁRQꢁWKHꢁFKDVVLVꢂ
The microprocessor is physically located in a SEC cartridge/heat sink
assembly on the system board. To reseat the microprocessor, remove the
2-4
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SEC cartridge/heat sink assembly and reinstall it as described in “SEC
Cartridge/Heat Sink Assembly” in Chapter 4, 5, 6, or 7, as appropriate for
your system.
To reseat a DIMM, remove it from its socket and reinstall it as described in
“DIMMs” in Chapter 4, 5, 6, or 7, as appropriate for your system.
If you need to reseat an expansion card, remove it from its connector and
reinstall it as described in “Expansion Cards” in Chapter 4, 5, or 6 or in
“Expansion Card” in Chapter 7, as appropriate for your system.
4. Verify that all jumpers are set correctly.
For information about these jumpers, see “System Board Jumpers” 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 power
sources, and turn them on.
Does the problem appear to be resolved?
Yes. No further steps are necessary. Terminate the procedure.
No. Proceed to the next sections, “Eliminating Resource Conflicts,”
“Running the System Diagnostics,” and “Getting Help.”
(OLPLQDWLQJꢀ5HVRXUFHꢀ&RQIOLFWV
Devices within the computer may require dedicated memory spaces, interrupt
levels, or DMA channels, all of which must be allocated during installation of
the devices. Because a device may be installed at a different time, it is possible
that the same resource is assigned to two or more devices.
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 and reassign the resources as necessary.
5XQQLQJꢀWKHꢀ6\VWHPꢀ'LDJQRVWLFV
The OptiPlex GX1/GX1p systems use either diskette-based or server-based
diagnostics. The OptiPlex NX1 systems use either server-based, hard-disk–
based, or (optionally) diskette-based diagnostics using an external diskette-
drive kit connected to the computer as shown in Figure 2-1 and described in
“Diskette-Based Diagnostics” found later in this chapter.
Basic Troubleshooting
2-5
6HUYHUꢃ%DVHGꢀ'LDJQRVWLFVꢀ
The server-based diagnostics contains tests that aid in troubleshooting major
components of the computer. To run the server-based diagnostics, follow
these steps:
1. Turn on all peripherals and the computer. If the system is already on, press
<Ctrl><Alt><Del> to reboot the system.
2. If necessary, enter the System Setup program and set the system to boot
from the network.
Highlight the Boot Sequence option (see Figure A-1). Either press
<Alt><d> to restore the default settings, or press <Ctrl> and the right-
arrow key to display the Device List screen (see Figure A-2). Then move
the LANDesk Service Agent option above the Hard Drive C: option in the
Boot Device Priority list. Press <Alt><B> to reboot the system.
3. Press the spacebar immediately after you see the following message:
3UHVVꢁWKHꢁꢃ6SDFHEDU!ꢁIRUꢁ&RQILJXUDWLRQꢁ6HUYLFHVꢁRUꢁꢃ(VF!ꢁRUꢁ
ꢃ&WUO!ꢃF!ꢁWRꢁFDQFHOꢂ
If you wait more than 5 seconds before pressing the spacebar, the mes-
sage disappears and the load operation continues. Let the system
complete the load operation; then shut down the system and try again.
4. Type fimmediately after you see a menu to enter the firmware update
services.
If you wait more than 3 seconds before making a selection, the system
automatically enters the software services.
5. Enter a user name and password at the logon prompt.
Contact the network administrator for information on system access.
6. Using the arrow keys, highlight Dell N 5XXX Diagnostics and press
<Enter>.
7. Select Run Once or Loop Continuously to begin the tests.
The tests continue to run until an error is encountered. When an error is
reported, you have the option of stopping or continuing the tests. When
the tests are completed or stopped, the total number of errors is reported;
there is no error log.
The server-based diagnostics consists of the following test groups:
‡ Coprocessor Tests — Check the math coprocessor’s numerical calculation
and error-handling abilities
‡ CMOS Confidence Test — Checks the NVRAM for accessibility and reliabil-
ity of data storage
‡ DMA Controller Test — Checks correct operation of the DMA controller
2-6
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‡ Timers Test — Checks the timers used by the microprocessor
‡ RTC Test — Confirms the functionality and accuracy of the computer’s RTC
‡ PIC Test — Generates an interrupt on each IRQ line to verify interrupt con-
troller operation
‡ Speaker Test — Checks the functionality of the speaker by generating
tones
‡ Video Tests — Verify proper operation of the video controller and the video
control circuitry
‡ USB1 Tests — Check the USB interface registers and the USB controller
‡ Serial Port 1 Tests — Check the computer’s interface with external devices
connected through serial port 1
‡ Serial Port 2 Tests — Check the computer’s interface with external devices
connected through serial port 2
‡ Parallel Port 1 Test — Checks several internal functions of the parallel port
‡ Mouse Test — Checks the functionality of the mouse controller and the
operation of the mouse keys
‡ Keyboard Tests — Verify the correct operation of the keyboard and the key-
board controller chip
‡ Disk 0 Tests — Check the hard-disk drive controller and the storage capabil-
ity of the hard-disk drive
For a complete description of the server-based diagnostics, see “Server-Based
Diagnostics” in the online Network Administrator’s Guide.
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6\VWHPVꢀ2QO\ꢍ
The hard-disk–based diagnostics contains tests that aid in troubleshooting all
major components of the system. If it is not possible to run the server-based
diagnostics or if the server-based diagnostics fails to reveal the source of a
suspected hardware problem, run the hard-disk–based diagnostics by follow-
ing these steps:
1. Turn on (or reboot) the system.
2. Press <Ctrl><Alt><F10> immediately after you see the following
message:
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SURJUDPꢂ
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.
Starting the diagnostics causes the Dell logo to appear on the monitor
screen, followed by a message indicating that the diagnostics is loading.
Before the diagnostics loads, a program tests the portion of main memory
Basic Troubleshooting
2-7
(RAM) required for loading the diagnostics. If a main memory error is
detected, a message indicates which DIMM has failed. If no errors are
found in main memory, the diagnostics loads and the Diagnostics Menu
appears.
3. Observe the monitor screen for the Diagnostics Menu.
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 test of the system
‡ Run Specific Tests — Tests a particular area or subsystem
If the Diagnostics Menu does not appear, check with the network admin-
istrator to determine if the service partition was removed from the hard-
disk drive. If it is not possible to run the hard-disk–based diagnostics and if
you are prepared to remove the computer cover, see “Internal Visual
Inspection” found earlier in this chapter. Otherwise, see “Getting Help”
found later in this chapter.
The hard-disk–based diagnostics consists of the following test groups:
‡ RAM Tests — Check all the directly addressable RAM
‡ System Set Tests — Check the computer’s system board components and
verify their related functions
‡ Video Tests — Verify proper operation of the video controller and the video
control circuitry
‡ Keyboard Tests — Verify the correct operation of the keyboard and the key-
board controller chip
‡ Mouse Test — Checks the functionality of the mouse controller and the
operation of the mouse keys
‡ Hard-Disk Drive Tests — Check the hard-disk drive controller and the stor-
age capability of the hard-disk drive
‡ Serial Ports Tests — Check the computer’s interface with external devices
connected through the serial ports
‡ Parallel Port Tests — Check the computer’s interface with external devices
connected through the parallel port
‡ Network Interface Tests — Verify the basic operation of the NIC, including
read and write access to its registers and internal transmit and receive
capability
'LVNHWWHꢃ%DVHGꢀ'LDJQRVWLFV
The OptiPlex GX1/GX1p systems use either diskette-based or server-based
diagnostics. The OptiPlex NX1 systems use either server-based, hard-disk–
based or optionally diskette-based diagnostics using an external diskette-drive
2-8
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kit connected to the computer as shown in Figure 2-1 and described in the fol-
lowing procedure.
The diskette-based diagnostics contains the same tests as the hard-disk–
based diagnostics. These tests aid in troubleshooting all major components
of the system.
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DOZD\VꢁXVHꢁDꢁEDFNXSꢁFRS\ꢁRIꢁWKHꢁGLDJQRVWLFVꢁGLVNHWWHꢁZKHQꢁVHUYLFLQJꢁ
DꢁXVHU·VꢁFRPSXWHUꢂꢁ'HOOꢁUHFRPPHQGVꢁWKDWꢁXVHUVꢁPDNHꢁVHYHUDOꢁFRSLHVꢁ
RIꢁWKHꢁRULJLQDOꢁGLVNHWWHꢁWRꢁHQVXUHꢁWKDWꢁRQHꢁLVꢁDOZD\VꢁDYDLODEOHꢂ
&RQQHFWLQJꢀDQꢀ([WHUQDOꢀ'LVNHWWHꢀ'ULYHꢀWRꢀWKHꢀ2SWL3OH[ꢀ1;ꢄꢀ&RPSXWHU
hard-disk drive
external diskette drive
diskette drive
connector
interface cable
Y-cable
P3 connector
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&RPSXWHU
To install the external diskette drive, follow these steps:
1. Turn off the computer, including any attached peripherals, and disconnect
all the AC power cables from their power sources.
2. Disconnect power input connector P3 from the back of the hard-disk drive.
3. Connect the interface cable to the back of the external diskette drive
(see Figure 2-1) and to the DSKT connector on the system board (see
Figure 1-12).
4. Attach the Y-cable to power input connector P3 as shown in Figure 2-1.
5. Connect the Y-cable’s hard-disk drive connector to the hard-disk drive.
6. Connect the Y-cable’s diskette drive connector to the back of the external
diskette drive.
Basic Troubleshooting
2-9
5XQQLQJꢀWKHꢀ'LVNHWWHꢃ%DVHGꢀ'LDJQRVWLFV
To run the diskette-based diagnostics, follow these steps:
1. Insert a copy of the Dell Diagnostics Diskette into the diskette drive. Turn
on all peripherals and the computer.
2. For OptiPlex NX1 systems, enter the System Setup program, set Diskette
Drive A to 3.5 Inch, 1.44 MB, and set Prim ary: under Drives: to Auto (see
Figure A-1). Then press <Alt><B> to reboot the system.
Starting the diagnostics causes the Dell logo to appear on the monitor
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 indicates which DIMM has failed. If no errors are
found in main memory, the diagnostics loads and the Diagnostics Menu
appears.
3. Observe the monitor screen for the Diagnostics Menu.
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 test of the system
‡ Run Specific Tests — Tests a particular area or subsystem
If the Diagnostics Menu does not appear, check the diskette drive connec-
tions, insert a copy of the diagnostics diskette into the diskette drive, and
reboot the system. If the Diagnostics Menu still does not appear, proceed
to the next section, “Getting Help.”
The diskette-based diagnostics consists of the same test groups described in
“Hard-Disk–Based Diagnostics (OptiPlex NX1 Systems Only)” found earlier in
this chapter. For a complete description of the diskette-based diagnostics, see
“Diskette-Based Diagnostics” in the online Network Administrator’s Guide or
online System User’s Guide.
*HWWLQJꢀ+HOS
If none of the troubleshooting procedures in this chapter or the tests in the
server-based, hard-disk–based, or diskette-based diagnostics reveals the
source of the problem or leads to the proper troubleshooting steps for deter-
mining the source of the problem, call Dell for technical assistance. For
instructions, see “Contacting Dell” in the online Network Administrator’s
Guide or online System User’s Guide.
2-10
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& + $ 3 7 ( 5 ꢁ ꢄ
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This chapter describes the beep codes and error messages that are common
to all members of the Dell OptiPlex GX1/GX1p Managed PC and OptiPlex NX1
Net PC family of computers. These error messages can occur during the POST
or, in the case of some failures, during normal system operation. The tables in
this chapter list faults that can cause a beep code or system error message to
occur and the probable causes of the fault in each case.
If a faulty system does not emit beep codes or display system error messages
to indicate a failure, you should use the system diagnostics to run the appropri-
ate tests to help isolate the source of the problem (see “Running the System
Diagnostics” in Chapter 2).
3267ꢀ%HHSꢀ&RGHV
If the monitor cannot display error messages during the POST, the system may
emit a series of beeps that identifies the problem or that can help you identify
a faulty component or assembly. Table 3-1 lists the beep codes that may be
generated during the POST. Most beep codes indicate a fatal error that pre-
vents the system from completing the boot routine until the indicated
condition is corrected.
When the system emits a beep code, record the code and then find it in
Table 3-1. If the table does not lead to the source of the problem, run the
appropriate tests in the system diagnostics to assist in troubleshooting the
problem.
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1-1-3
(UURU
3UREDEOHꢁ&DXVHV
NVRAM write/read failure
BIOS checksum failure
Defective system board
1-1-4
Faulty BIOS or defective
system board
1-2-1
Programmable interval-timer Defective system board
failure
1-2-2
1-2-3
DMA initialization failure
DMA page register write/
read failure
Beep Codes and Error Messages
3-1
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%HHSꢁ&RGH
(UURU
3UREDEOHꢁ&DXVHV
1-3-1
Main-memory refresh verifi-
cation failure
Faulty or improperly seated
DIMM or defective system
board
1-3-2
1-3-3
No memory installed
No memory installed or faulty
or improperly seated DIMM
Chip or data line failure in the Faulty or improperly seated
first 64 KB of main memory
DIMM
1-3-4
1-4-1
1-4-2
Odd/even logic failure in the
first 64 KB of main memory
Address line failure in the
first 64 KB of main memory
Parity failure in the first
64 KB of main memory
2-1-1
through
2-4-4
Bit failure in the first 64 KB of
main memory
3-1-1
3-1-2
3-1-3
Slave DMA-register failure
Master DMA-register failure
Defective system board
Master interrupt-mask regis-
ter failure
3-1-4
3-2-4
Slave interrupt-mask register
failure
Keyboard-controller test
failure
Faulty keyboard controller
(defective system board)
3-3-4
3-4-1
Screen initialization failure
Screen-retrace test failure
Faulty video subsystem
(defective system board)
3-4-2
4-2-1
Search for video ROM failure
No timer tick
Defective system board
4-2-2
4-2-3
4-2-4
Shutdown failure
Gate A20 failure
Unexpected interrupt in
protected mode
4-3-1
4-3-3
Memory failure above
address 0FFFFh
Faulty or improperly seated
DIMM
Timer-chip counter 2 failure
Defective system board
3-2
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3UREDEOHꢁ&DXVHV
4-3-4
Time-of-day clock stopped
Bad battery or defective
system board
4-4-1
Serial-port test failure
Faulty I/O chip (defective
system board)
4-4-2
4-4-3
Parallel-port test failure
Math coprocessor failure
Faulty system board
Faulty microprocessor chip or
system board
4-4-4
Cache test failure
Defective microprocessor or
system board
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System error messages typically are presented on the screen during the POST
but can occur any time an error is detected by the system. System messages
are very useful in troubleshooting the system. Some of these messages
require operator intervention to solve; others indicate fatal errors that must be
solved before the system will reboot.
Table 3-2 lists the system error messages that can occur and the probable
cause for each message.
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$GGUHVVꢁPDUNꢁ
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BIOS found faulty disk
sector or could not find
particular disk sector.
Faulty diskette/tape drive
subsystem or hard-disk
drive subsystem (defec-
tive system board).
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Diskette drive or hard-
disk drive controller
cannot send data to
associated drive.
Faulty interface cable or
connector.
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Bad command.
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does not exist or is not
in pathname specified.
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FRUUHFWLRQꢁFRGHꢁ disk drive controller
ꢅ(&&ꢆꢁRQꢁGLVNꢁ
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Diskette drive or hard-
Faulty diskette/tape drive
subsystem or hard-disk
drive subsystem (defec-
tive system board).
detected uncorrectable
read error.
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IDLOHG
associated controller
defective.
Beep Codes and Error Messages
3-3
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Computer received un-
recoverable data-read
error from diskette or
hard-disk drive.
Faulty diskette, diskette
drive, or hard-disk drive.
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Read/write failure
during POST prevents
system from using avail- seated.
able memory.
One or more DIMMs
faulty or improperly
'LVNHWWHꢁGULYHꢁ
ꢇꢁVHHNꢁIDLOXUH
Diskette/tape drive con- Faulty or improperly
troller could not locate
specific sector or track.
inserted diskette,
incorrect configuration
settings in System Setup
program, loose diskette/
tape drive interface cable,
or loose power cable.
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ꢈꢁVHHNꢁIDLOXUH
'LVNHWWHꢁUHDGꢁ
IDLOXUH
Failure occurred while
system attempted to
read diskette.
Faulty diskette, faulty or
improperly connected
diskette/tape drive inter-
face cable, or loose
power cable.
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V\VWHPꢁUHVHWꢁ
IDLOHG
System could not suc-
cessfully issue reset
command to diskette
controller.
Faulty diskette/tape drive
controller (defective sys-
tem board).
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SURWHFWHG
Diskette write-protect
feature activated.
Diskette write-protected.
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or improperly inserted
Defective, unformatted,
or improperly inserted
diskette.
in diskette drive.
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IDLOXUH
Gate A20 of the
keyboard controller
malfunctioned.
Faulty keyboard controller
(defective system board).
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Operating system can-
not execute command.
Operating system cor-
rupted or not installed
properly.
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FRQWUROOHUꢁ
IDLOXUH
Hard-disk drive failed to Incorrect configuration
initialize.
settings in System Setup
program, improperly con-
nected hard-disk drive
cable, faulty hard-disk
drive controller sub-
system, or loose power
cable.
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,QYDOLGꢁFRQILJꢄ System Setup program
Incorrect configuration
settings in System Setup
program or faulty battery.
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contains incorrect
system configuration
settings.
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.H\ERDUGꢁFORFNꢁ System cannot commu- Keyboard cable connec-
OLQHꢁIDLOXUH
nicate with keyboard.
tor loose or improperly
connected, defective
keyboard, or defective
keyboard/mouse
.H\ERDUGꢁGDWDꢁ
OLQHꢁIDLOXUH
controller (defective
system board).
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IDLOXUH
.H\ERDUGꢁVWXFNꢁ
NH\ꢁIDLOXUH
.H\ERDUGꢁ
FRQWUROOHUꢁ
IDLOXUH
Keyboard/mouse con-
troller failed.
Defective keyboard/
mouse controller (defec-
tive system board).
0HPRU\ꢁDGGUHVVꢁ During memory test,
Faulty or improperly
seated DIMMs or defec-
tive system board.
OLQHꢁIDLOXUHꢁDW
DGGUHVV,ꢁUHDGꢁ
YDOXHꢁH[SHFWLQJꢁ
YDOXH
value read at address
was incorrect.
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Beep Codes and Error Messages
3-5
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Memory test did not
complete.
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terminated by pressing
the spacebar.
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System does not recog- Faulty diskette, diskette/
nize diskette drive or
hard-disk drive from
which it is trying to
boot.
tape drive subsystem,
hard-disk drive, hard-disk
drive subsystem, or no
boot disk in drive A.
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Configuration settings
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drive.
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subsystem.
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kette or hard-disk drive. drive.
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Beep Codes and Error Messages
3-7
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This chapter provides procedures for removing the components, assemblies,
and subassemblies in the Dell OptiPlex GX1 low-profile computer. If you are
servicing a midsize, mini tower, or OptiPlex NX1 Net PC chassis, use
Chapter 5, 6, or 7, as appropriate for your system.
Unless otherwise noted, each procedure assumes the following:
‡ You have performed the steps in “Precautionary Measures” found later in
this chapter.
‡ You have removed the computer cover.
‡ You can replace or reinstall a part by performing the removal procedure in
reverse order unless additional information is provided.
5HFRPPHQGHGꢀ7RROV
Most 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 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\ꢀ0HDVXUHVꢀ
Before you perform any of the procedures in this chapter, take a few moments
to read the following warning for your personal safety and to prevent damage
to the system from ESD.
Removing and Replacing Parts on the Low-Profile Chassis
4-1
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LQꢁWKHꢁVHTXHQFHꢁOLVWHGꢀꢁ
1. Turn off the com puter and any attached peripherals.
2. Disconnect the com puter and any attached peripherals from their
power sources to reduce the potential for personal injury. Also, dis-
connect any telephone or telecom m unication lines from the
com puter.
3. Wait 5 seconds after powering dow n the com puter before
disconnecting a peripheral from the com puter or rem oving a
com ponent from the com puter’s system board to avoid possible dam -
age to the system board.
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Figure 4-1 shows an internal view of the interior of the low-profile computer
and identifies major components for orientation. Refer to this illustration, as
needed, when performing the component removal/replacement procedures in
this chapter.
4-2
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&RPSXWHUꢀ&RYHU
securing
buttons (2)
front of com puter
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To remove the computer cover, follow these steps:
1. Turn off power to all peripherals, and disconnect the AC power cable from
its electrical outlet.
2. Remove the padlock if one is installed.
3. Press in on the two securing buttons until the cover is free to swing up.
4. Raise the back of the cover, and pivot it toward the front of the computer.
5. Lift the cover off of the hooks at the front of the chassis.
Three plastic hooks on the inside-front part of the cover secure it to the
chassis.
Before you reinstall the cover, fold all cables out of the way so that they do not
interfere with the cover or with proper airflow inside the computer.
4-4
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(MHFWꢊꢀ3RZHUꢊꢀDQGꢀ5HVHWꢀ%XWWRQV
ꢀ
eject button
computer cover
(upside down)
reset button
power button
)LJXUHꢀꢆꢃꢅꢂꢀꢀ(MHFWꢊꢀ3RZHUꢊꢀDQGꢀ5HVHWꢀ%XWWRQꢀ5HPRYDOꢀꢀꢀꢀꢀ
1. Lay the computer cover upside down on a flat work surface, with the back
of the cover facing you.
2. To remove the 3.5-inch diskette-drive eject button, pull gently on the plastic
part of the button until it comes free.
3. To remove the power button or the reset button, use a small screwdriver
and push in on the two or three plastic clips that hold the button to the
computer cover.
When these clips are released, the button comes free from the front panel
of the cover.
Removing and Replacing Parts on the Low-Profile Chassis
4-5
)URQWꢃ3DQHOꢀ,QVHUWV
5.25-inch
front-panel
insert
computer cover
(upside down)
posts (2)
ring-tabs (2)
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To remove a front-panel insert, follow these steps:
1. Lay the computer cover upside down on a flat work surface, with the front
of the cover facing you.
2. From the front of the cover, use your thumbs to push inward on the insert
until it slides off the two posts.
To replace a 5.25-inch front-panel insert, position the two ring-tabs over the
posts on the inside of the bay opening, and then press the ring-tabs over the
posts. If necessary, use a 1/4-inch nutdriver to help push on the ring-tabs.
4-6
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&RQWUROꢀ3DQHO
chassis
mounting screw
control panel cable
control panel
mounting tab
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To remove the control panel, follow these steps:
1. Disconnect the control panel cable from the PANEL connector on the sys-
tem board.
2. From the inside of the chassis, remove the mounting screw holding the
control panel to the chassis.
3. Remove the control panel from the chassis.
When you reinstall the control panel, be sure to put the right side of the control
panel behind the mounting tab.
Removing and Replacing Parts on the Low-Profile Chassis
4-7
'ULYHV
Figure 4-6 shows an example of drive hardware that can be installed in the
computer. Refer to this figure when you perform any of the procedures in the
following subsections.
diskette/tape drive
3.5-inch diskette drive
interface cable
DC power cable
5.25-inch drive
bay and bracket
power supply
hard-disk drive
EIDE cable
primary EIDE
interface
connector (IDE1)
EDFNDSKT connector
secondary EIDE
interface
connector (IDE2)
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([WHUQDOO\ꢀ$FFHVVLEOHꢀ'ULYHꢀ$VVHPEOLHV
The following subsections contain removal/replacement procedures for drives
installed in the externally accessible drive bays.
4-8
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ꢅꢆꢇꢃ,QFKꢀ'LVNHWWHꢀ'ULYHꢀ$VVHPEO\
drive-mounting
screws (2)
3.5-inch diskette-drive-assembly
latches (2)
front of com puter
hooks (2)
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To remove the 3.5-inch diskette drive assembly, follow these steps:
1. Disconnect the DC power cable and the interface cable from the back of
the diskette drive.
2. Press the two 3.5-inch diskette-drive-assembly latches to the left to release
the assembly.
Rotate the left side of the assembly up, and lift the assembly out of the
chassis.
3. Remove the two drive-mounting screws from the left side of the drive, and
remove the drive from the bracket.
When you replace the 3.5-inch diskette drive, be sure that the mounting holes
on the right side of the drive engage the two hooks on the bracket.
Removing and Replacing Parts on the Low-Profile Chassis
4-9
ꢇꢆꢈꢇꢃ,QFKꢀ'ULYHꢀ$VVHPEO\
front of com puter
drive-mounting
screws (4)
)LJXUHꢀꢆꢃꢎꢂꢀꢀꢇꢂꢄꢇꢃ,QFKꢀ'ULYHꢀ$VVHPEO\ꢀ5HPRYDO
To remove a 5.25-inch drive assembly, follow these steps:
1. Remove the 3.5-inch diskette drive assembly.
2. Disconnect the DC power cable and the interface cable from the back of
the 5.25-inch drive.
3. Lift the 5.25-inch drive assembly straight up and out of the chassis.
4. Lay the 5.25-inch drive assembly upside down; then remove the four
screws attaching the drive to the bracket.
When you replace the 5.25-inch drive, place the front of the drive toward the
front of the bracket; then install the four screws, but do not tighten them. Align
the screws with the score marks on the bracket, and tighten the screws in the
order stamped on the bottom of the bracket.
Check the alignment of the computer cover around the 5.25-inch drive bezel.
Adjust the drive forward or backward on the bracket to align it.
4-10
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+DUGꢃ'LVNꢀ'ULYHꢀ$VVHPEO\
hard-disk drive
mounting screw
holes (4)
tabs (2)
captive screw
notches (2)
front of com puter
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To remove the hard-disk drive, follow these steps:
1. Disconnect the DC power cable and the interface cable from the back of
the drive.
2. Loosen the captive screw that secures the hard-disk drive bracket to the
chassis.
3. Pivot the hard-disk drive assembly up and lift it out of the chassis.
4. Remove the four hard-disk drive mounting screws that attach the hard-disk
drive to the hard-disk drive bracket.
When you reinstall the hard-disk drive assembly, be sure that the tabs on the
back of the mounting plate fully engage the notches on the chassis—before
you rotate the assembly into place.
Removing and Replacing Parts on the Low-Profile Chassis
4-11
6\VWHPꢀ3RZHUꢀ6XSSO\ꢀ
power supply
power-supply
mounting screw
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To remove the system power supply, follow these steps:
1. Disconnect the AC power cable from the back of the power supply.
2. Disconnect the DC power cables from the system board and the drives.
3. Remove the power-supply mounting screw at the back of the chassis.
4. Slide the system power supply forward until it stops; then lift it from the
chassis.
When you replace the system power supply, place it down inside the chassis
and against the right side of the chassis. Then slide the system power supply
toward the back of the chassis, and hook the tabs into the right side of the
power supply.
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4-12
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The computer has a removable expansion-card cage. The expansion-card cage
contains the riser board and any installed expansion cards. Dell recommends
that you remove the expansion-card cage first before removing or installing
expansion cards.
If you are not removing any of the expansion cards, leave the external cables
attached to the expansion cards.
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lever
expansion-card cage
ISA expansion-card
end support
side support
hole
notch
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To remove an expansion-card cage, follow these steps:
1. Rotate the lever toward the back of the computer until it stops in the
upright position.
2. Lift the expansion-card cage up and away from the computer.
To replace an expansion-card cage, keep it flush against the chassis to ensure
that the lever engages the notch in the chassis when the lever is depressed.
If reinstalling an ISA expansion card into the expansion-card cage, be sure to
slip the end of the ISA expansion card into the plastic ISA expansion-card end
support. The ISA expansion-card end support should not be removed; how-
ever, if it is accidentally removed, reinstall it by first inserting its top tab into the
side support hole and then sliding the bottom two tabs into the two support
holes on the chassis floor.
Removing and Replacing Parts on the Low-Profile Chassis
4-13
([SDQVLRQꢀ&DUG
retaining screw
expansion card
card-mounting
bracket
expansion-card
connector
card-slot
opening
riser board
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To remove an expansion card, follow these steps:
1. Disconnect any external cables from the expansion card being removed.
2. Remove the expansion-card cage.
3. Remove the retaining screw from the card-mounting bracket.
4. Grasp the expansion card by its corners, and carefully remove it from the
expansion-card connector.
4-14
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5LVHUꢀ%RDUG
ꢀ
riser-board mounting
screws (2)
riser-board
alignment slot
riser board
expansion-card cage
)LJXUHꢀꢆꢃꢁꢅꢂꢀꢀ5LVHUꢀ%RDUGꢀ5HPRYDO
To remove the riser board, follow these steps:
1. Remove the expansion-card cage and all expansion cards.
2. Lay the expansion-card cage on a flat work surface, with the riser board
facing up.
3. Remove the two riser-board mounting screws.
4. Lift the riser board away from the expansion-card cage.
When you replace the riser board, be sure that the alignment feature on the
expansion-card cage engages with the alignment slot.
Removing and Replacing Parts on the Low-Profile Chassis
4-15
6\VWHPꢀ%RDUG
screw
slots (5)
tabs (5)
)LJXUHꢀꢆꢃꢁꢆꢂꢀꢀ6\VWHPꢀ%RDUGꢀ5HPRYDO
To remove the system board, follow these steps:
1. Disconnect all cables from their connectors at the back of the computer.
2. Remove the expansion-card cage.
3. Disconnect all cables from the system board.
4. Remove the screw that secures the system board to the bottom of the
chassis.
5. Slide the system board toward the front of the chassis until it stops.
6. Carefully lift the system board out of the chassis (be sure to lift evenly and
not twist the system board).
NOTES: If you are replacing the system board, remove all DIMMs, the
video-memory upgrade module (if present), the single-edge contact (SEC)
cartridge/heat sink assembly, and the guide bracket assembly from the old
system board and install them on the replacement board. Also, set the
jumpers on the new system board so that they are identical to those on the
old board, unless a microprocessor upgrade is being installed.
If the original system board has a NIC connector, ensure that the replacement
board has a NIC connector.
When you reinstall the system board (before you slide the system board back
to lock it in position), push down near each slot to engage the grounding clip
onto its corresponding tab. Push evenly on both sides of the system board as
you slide it into position (do not twist the system board).
4-16
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6\VWHPꢀ%RDUGꢀ&RPSRQHQWV
The following subsections contain procedures for removing/replacing system
board components (see Figures 1-12 and 1-13).
',00V
To remove a DIMM from one of the three DIMM sockets, follow these steps:
1. Remove the system power supply.
2. Locate the three DIMM sockets.
3. To remove a DIMM, push outward on the DIMM socket’s securing clips
until the DIMM is released from its socket.
securing clips (2)
2.
1.
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4. Lift the DIMM away from the socket.
5. Reinstall the replacement DIMM by pressing the DIMM fully into the
socket while closing the securing clips to lock the DIMM into the socket.
2.
securing clips (2)
1.
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6. Replace all assemblies and cables previously removed.
Removing and Replacing Parts on the Low-Profile Chassis
4-17
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notch
video-memory
upgrade module
video-memory
upgrade socket
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You can upgrade video memory from 4 to 8 MB by installing a video-memory
upgrade module in the video-memory upgrade socket on the system board.
Adding additional video memory increases the system’s video performance
and provides additional modes for high-resolution/expanded color applications.
To install the video memory upgrade, follow these steps:
1. Remove the expansion-card cage.
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LQVHUWLQJꢁLWꢁLQWRꢁWKHꢁVRFNHWꢂ
2. Orient the video-memory upgrade module as shown in Figure 4-17. Then
carefully align the module’s edge connector pins with the socket ensuring
that the slot in the module mates with the socket key.
3. Press the video-memory upgrade module firmly into the socket, and pivot
the module downward until the module clicks into place.
NOTE: If you do not hear a sharp click when installing the video-memory
upgrade module, remove the module and repeat steps 2 and 3.
4. Replace the expansion-card cage.
5. Replace the computer cover, and reconnect the AC power cable to the
electrical outlet. Press the power button on the computer to reboot the
system.
NOTE: As the system boots, it automatically detects the presence of the
new video-memory upgrade module and automatically changes the sys-
tem configuration information in the System Setup program.
4-18
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6. Enter the System Setup program, and confirm that 8 MB is shown in the
Video Mem ory option. If the total memory is listed incorrectly, repeat
steps 1 through 6 to reseat the video-memory upgrade module and verify
that the computer acknowledges the module.
7. Run the system diagnostics (Video Test Group) to test the new video-
memory upgrade module.
0LFURSURFHVVRUꢀ
To take advantage of future options in processor speed and functionality, you
can replace the microprocessor on your system board with any Dell-supported
microprocessor upgrade. The microprocessor upgrade kit is shipped with an
SEC cartridge/heat sink assembly, which includes the microprocessor, micro-
processor heat sink, and L2-cache memory module.
You may also have to reseat or replace an SEC cartridge/heat sink assembly
during normal maintenance.
6(&ꢀ&DUWULGJHꢋ+HDWꢀ6LQNꢀ$VVHPEO\
SEC cartridge
release latches (2)
heat sink
SEC
cartridge
heat sink clips (2)
guide bracket assembly
metal standoffs (2)
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Removing and Replacing Parts on the Low-Profile Chassis
4-19
To remove the SEC cartridge/heat sink assembly, follow these steps:
1. Remove the system power supply.
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KRWꢁGXULQJꢁV\VWHPꢁRSHUDWLRQVꢂꢁ%HꢁVXUHꢁWKDWꢁWKHꢁDVVHPEO\ꢁKDVꢁKDGꢁVXIꢃ
ILFLHQWꢁWLPHꢁWRꢁFRROꢁEHIRUHꢁWRXFKLQJꢁLWꢂ
2. Locate the SEC cartridge/heat sink assembly.
3. Disconnect the microprocessor fan connector from the 3-pin connector on
the system board (labeled “FAN”), located between the SERIAL2 connec-
tor and the MONITOR connector.
4. Release the two securing clips near the base of the heat sink from the
metal standoffs.
5. Locate and press inward on the SEC cartridge release latches (located
directly on top of the SEC cartridge adjacent to the heat sink assembly)
until the latches click.
6. Lift the SEC cartridge/heat sink assembly out of its guide bracket
assembly/connector on the system board.
NOTE: When installing the SEC cartridge/heat sink assembly, press outward
on the SEC cartridge release latches and then carefully orient the assembly
and press firmly with up to 25 pounds of force to mate the SEC cartridge with
its connector. The SEC cartridge release latches will click into the locked posi-
tion as the assembly is seated.
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battery
BATTERY
socket
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To remove the system battery, follow these steps:
1. If possible, boot the system and enter the System Setup program. Then
record important system configuration information (see Appendix A, “Sys-
tem Setup Program,” for details).
4-20
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2. Turn off power to all peripherals, and disconnect the AC power cable from
its electrical outlet.
3. Remove the computer cover.
4. Remove the expansion-card cage, and locate the battery in the front-right
corner of the system board adjacent to the DIMM connectors.
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QRWꢁWRꢁWRXFKꢁWKHꢁV\VWHPꢁERDUGꢁZLWKꢁWKHꢁREMHFWꢂꢁ(QVXUHꢁWKDWꢁWKHꢁ
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RQꢁWKHꢁV\VWHPꢁERDUGꢂ
5. Remove the battery by carefully prying it out of its socket with your fingers
or with a blunt, nonconducting object, such as a plastic screwdriver.
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6. Insert the battery into the socket (with the positive side labeled “+” facing
upwards), and snap it into place.
7. Replace the expansion-card cage; replace the computer cover, reconnect
all cabling, and reboot the system.
8. Enter the System Setup program, and configure the system using the infor-
mation from the printouts you made earlier.
9. Turn off the computer; wait 10 or more minutes, and then reenter the Sys-
tem Setup program to ensure that the date and time are still correct,
indicating that the system battery is functioning correctly.
Removing and Replacing Parts on the Low-Profile Chassis
4-21
4-22
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This chapter provides procedures for removing the components, assemblies,
and subassemblies in the Dell OptiPlex GX1/GX1p midsize computer. If you
are servicing a low-profile, mini tower, or OptiPlex NX1 Net PC chassis, use
Chapter 4, 6, or 7, as appropriate for your system.
Unless otherwise noted, each procedure assumes the following:
‡ You have performed the steps in “Precautionary Measures” found later in
this chapter.
‡ You have removed the computer cover.
‡ You can replace or reinstall a part by performing the removal procedure in
reverse order unless additional information is provided.
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Most 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 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.”
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Before you perform any of the procedures in this chapter, take a few moments
to read the following warning for your personal safety and to prevent damage
to the system from ESD.
Removing and Replacing Parts on the Midsize Chassis
5-1
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LQꢁWKHꢁVHTXHQFHꢁOLVWHGꢀ
1. Turn off the com puter and any attached peripherals.
2. Disconnect the com puter and any attached peripherals from their
power sources to reduce the potential for personal injury. Also,
disconnect any telephone or telecom m unication lines from the
com puter.
3. Wait 5 seconds after powering dow n the com puter before
disconnecting a peripheral from the com puter or rem oving a com po-
nent from the com puter’s system board to avoid possible dam age to
the system board.
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IDFHꢅꢁVXFKꢁDVꢁWKHꢁSDGORFNꢁORRSꢁRQꢁWKHꢁEDFNꢁRIꢁWKHꢁFKDVVLVꢂꢁ,IꢁDꢁZULVWꢁ
JURXQGLQJꢁVWUDSꢁLVꢁQRWꢁDYDLODEOHꢅꢁSHULRGLFDOO\ꢀWRXFKꢀDQꢁXQSDLQWHGꢁ
PHWDOꢁVXUIDFHꢁRQꢁWKHꢁEDFNꢁRIꢁWKHꢁFRPSXWHUꢁWRꢁGLVFKDUJHꢁDQ\ꢁVWDWLFꢁ
FKDUJHꢁIURPꢁ\RXUꢁERG\ꢂꢁ$YRLGꢁWRXFKLQJꢁFRPSRQHQWVꢁDQGꢁFRQWDFWVꢁRQꢁ
DꢁFDUGꢅꢁDQGꢁDYRLGꢁWRXFKLQJꢁSLQVꢁRQꢁDꢁFKLSꢁWRꢁSUHYHQWꢁVWDWLFꢁHOHFWULFLW\ꢁ
GDPDJHꢂ
,QVLGHꢀWKHꢀ&RPSXWHU
Figure 5-1 shows an internal view of the midsize computer and identifies major
components for orientation. Refer to this illustration, as needed, when per-
forming the component removal/replacement procedures in this chapter.
5-2
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2SWLRQDOꢀ6WDQG
optional-stand screw
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To remove the optional stand, follow these steps:
1. Place the right side of the computer on a flat work surface.
2. Unscrew the optional-stand screw.
Use your fingers or a wide flat-blade screwdriver to unscrew the optional-
stand screw.
3. Pull the optional stand away from the computer.
Disengage the three orientation nubs that position and help hold the
optional stand to the computer.
5-4
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&RPSXWHUꢀ&RYHU
securing
buttons (2)
front of com puter
)LJXUHꢀꢇꢃꢅꢂꢀꢀ&RPSXWHUꢀ&RYHUꢀ5HPRYDO
To remove the computer cover, follow these steps:
1. Turn off power to all peripherals, and disconnect the AC power cable from
its electrical outlet.
2. Press in on the two securing buttons until the cover is free to swing up.
3. Raise the back of the cover, and pivot it toward the front of the computer.
4. Lift the cover off the hooks at the front of the chassis.
Four plastic hooks on the inside-front part of the cover secure it to the
chassis.
Before you reinstall the cover, fold all cables out of the way so that they do not
interfere with the cover or with proper airflow inside the computer.
Removing and Replacing Parts on the Midsize Chassis
5-5
(MHFWꢊꢀ3RZHUꢊꢀDQGꢀ5HVHWꢀ%XWWRQV
ꢀ
computer cover
(upside down)
eject button
reset button
power button
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To remove the eject, power, and reset buttons, follow these steps:
1. Lay the computer cover upside down on a flat work surface, with the back
of the cover facing you.
2. To remove the 3.5-inch diskette-drive eject button, pull gently on the plastic
part of the button until it comes free.
3. To remove the power button or the reset button, use a small screwdriver
and push in on the two or three plastic clips that hold the button to the
computer cover.
When these clips are released, the button comes free from the front panel
of the cover.
5-6
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