Dell OptiPlex G1, Service Manual

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1-2 Dell OptiPlex G1 Managed PC Systems Service Manual
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The three OptiPlex G1 chassis configurations differ primarily in the following
expansion features:
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Number of expansion slots available for PCI/ISA expansion cards
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Number of available internal drive bays for EIDE drives
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Number of available external drive bays for diskette, CD-ROM, or tape
drives
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Physical size and power supply types (the midsize and mini tower systems
use the same power supply)
Due to the physical differences in the three chassis configurations, a separate
parts removal and replacement chapter (Chapters 4 through 6) is provided for
each chassis type.
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All three chassis configurations have the following similarities:
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Same system board
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Identical operational characteristics (same BIOS, POST, memory,
microprocessor, external I/O ports, and so on)
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Identical diagnostics, diagnostic beep codes, and diagnostic-screen error
messages (see Chapters 1 through 3 and Appendix A)
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The features described in the following subsections are common to all chassis
configurations.
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All OptiPlex G1 systems incorporate the Pentium II microprocessor for
improved operating speeds and overall performance. Some of the major
enhancement features of the Pentium II microprocessor include internal 16-KB
data and instruction caches, internal math coprocessor, and the MMX instruc-
tion set for high performance in complex multimedia and communications
environments. The Pentium II microprocessor also uses a technique called
“single instruction, multiple data” (SIMD), which permits processing data ele-
ments in parallel for additional system performance enhancement.
The microprocessor is physically located in a single-edge contact (SEC)
cartridge/heat sink assembly on the system board for ease of upgrading when
faster processors become available. Contact Dell Computer Corporation for
information about Dell-supported microprocessor upgrades.