Sun Microsystems SPARCstation 20 Service Manual page 262

harness, 58
off, 45
on, 45
supply, 55
captive screws, 56, 58
chassis mounts, 56
connector pin assignments, 31
connector pinouts, 30
disconnecting, 56, 98
output voltages, 29
removing, 57
test, 29
switch, 46
switch, standby, 139
system, 45
power-off, 228
power-on
does not succeed, 29
self-sest, 17
sequence, 46
standby, 46
precautions, 41
ESD, 42
preface, xix
preventing damage, 139
printed circuit board
handling, 40
PCB, 40
probe
-scsi, 14, 33
-scsi-all, 14
probe-scsi, 226
probe-scsi command output message, 227
probe-scsi-all, 226
probe-scsi-all command output message, 227
procedures
troubleshooting, 27
product
description, 1
specifications, 191
R
rear view
SunCD 2Plus, 125
SunCD 4 drive, 125
238 SPARCstation 20 Service Manual • July 1996
related documentation, xxii
removing
AVB, 168, 169
CD-ROM drive, 123, 124
cover, 50
DC power harness
(SunCD 2Plus drive-type chassis), 97
(SunCD 4 drive-type chassis), 103
diskette drive, 127, 131
diskette drive cable
(SunCD 2Plus drive-type chassis), 108
(SunCD 4 drive-type chassis), 111
double-wide
MBus module, 147, 149
SBus card, 154
fan, 67, 69
hard disk drive, 117, 120
LED, 60
NVRAM/TOD, 180
OpenBoot PROM, 178
power from the system, 45
power supply, 57
SBus card, 152
adapter bracket, 156
extractor, 155
SCSI backplane, 84
SCSI data cable
(SunCD 2 Plus drive-type), 88
(SunCD 4 drive-type chassis), 93
SIMM, 161
single-wide MBus module, 143, 145
speaker, 64
subassemblies, 55
system board, 95, 105, 171, 173
replacement
component, 143
part numbers, 183
parts list, 183
system board, 143
replacing
cover, 51
requirements
operating systems, 6
safety, 39
software, 6
restarting system while troubleshooting, 46
RS-423 mode, 174