Sun Microsystems SPARC classic X, Руководство по обслуживанию

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Chapter 10 System Board Overview 10-7
Visually identify each CRU by looking at the appropriate system board layout
illustration from
FIGURE 10-1
,
FIGURE 10-2
, or
FIGURE 10-3
, and by looking at the unit
bottom illustration in
FIGURE 10-4
.
TABLE 10-2
lists acronyms and abbreviations for
certain components of the MLB.
The SPARCclassic/SPARCclassic X/SPARCstation LX system board CRUs are listed
below.
Unit bottom
■
DSIMMs
■
VSIMM
■
SBus cards
■
Speaker/power LED assembly
■
Main logic board
■
NVRAM
■
System I/O board
Internal cables
■
Diskette drive data cable (Not applicable to SPARCclassic X terminal)
■
Hard disk drive data cable (Not applicable to SPARCclassic X terminal)
Note –
As noted in the part labels shown in
FIGURE 10-4
, some items are not
applicable to the SPARCclassic X terminal.
TABLE 10-2
Acronyms for Components of the Main Logic Board
Acronym/Abbreviation Full Expression
NVRAM Nonvolatile Random Access Memory
PROM Programmable Read-Only Memory
PTC Positive Temperature Coefficient
DRAM Dynamic Random Access Memory
DSIMM Dynamic Single In-line Memory Module
VSIMM Video Single In-line Memory Module
AUI Attachment Unit Interface (Ethernet adapter cable)
LED Light-Emitting Diode
ISDN Integrated Services Digital Network