Service manual

12 Troubleshooting
Table 2–1 lists the location of each memory SIMM and contains possible
failure codes.
Table 2–1 Locating a Failed Memory SIMM
Memory Module
Configurations 8-Digit Error Code for MEM
SIMM Callout on
System Module 87654321
SIMM 1 0000000X
1
SIMM 2 000000X
1
0
SIMM 3 00000X
1
00
SIMM 4 0000X
1
000
SIMM 5 000X
1
0000
SIMM 6 0 0 X
1
00000
SIMM 7 0 X
1
000000
SIMM 8 X
1
0000000
1
A 0 in this SIMM location means this SIMM is good. Anything from 1 through F indicates
this SIMM is failing. For example; a code of 00004000 indicates that the SIMM, numbered 4
on the etch of the system module, is bad.
2.3 SCSI-A Troubleshooting
SCSI-A is the internal SCSI bus. To test the internal SCSI bus, execute
test 7. You will find only half-height hard disk and/or half-height 3.5-inch
floppy drives internal to the system.
In the following procedure an RX23 is discussed. The procedure for
troubleshooting the RX23 disk with the SCSI/FDI adapter module is the
same as troubleshooting the other drives on the SCSI bus. Remember
that the device name of the RX23 drive is usually DKA500. The 5
indicates the SCSI ID and the A indicates the RX23 is on the SCSI-A
bus.
The diagnostics used to test the RX23 drive and the SCSI/FDI adapter
module are the self-test and the system exerciser.