System Exerciser Codes Explained; Additional Scsi Bus Information - Digital Equipment VAXstation 3100 Maintenance Manual

40 Troubleahootlng
2.15.2.1 System Exerciser Codes Explained
Figure 2-8 shows the system exerciser display for SCSI-B (SCSI-A codes are
similar). There is one line for the status of the SCSI controller on the MSC
module and one line for each of the drives installed oo the SCSI bus. The
status of the SCSI controller is next to the SCSI-B mnemonic (first line) and
the status of each drive is listed under the controller's code (separate line for
each drive).
6 OOAO scs~-B
6000.0001
2200.0001
3200.0001
- ------4100.0001
5300.0001
TK50Z expanaion box
4 0000
RRD40 compact diac drive
RZ23 diak drive (user disk)
RZ23 disk drive (system disk)
0 00:03:18
Figure 2....S System Exerciser Example for SCSl"B Device
An
easy way to determine if any errors are detected is by looking for the
question marks in the left column.
If
there are any question marks on the
SCSI controller's status line, the SCSI controller is probably faulty and the
error code identifies the problem. If there are any question marks on a drive's
status line, the problem could be in either the drive, the SCSI
bu~
cabling or
terminator, or the SCSI controller. For example an error that is listed
in
the
drive's code may be a data transfer error and does not isolate the problem to
the device itseJf;
it may still be in the SCSI controller. Appendix F contains
a complete list of the system exerciser error codes.
2.15.3 Additional SCSI Bus Information
The SCSI bus controller controls up to seven SCSI devices on the SCSI bus.
Model 30 bas one SCSI controller (SCSI-A) on its ST506/SCSI MSC module
and both model 30 and model 40 have two SCSI bus controllers (SCSI-A
and SCSI-B) when the SCSI/SCSI MSC module is installed. The SCSI-A
bus on the ST506/SCSI MSC module can have internal and external devices
connected while the SCSI-A bus on the SCSI/SCSI MSC module can only have
internal devices connected. The SCSI-B bus on the SCSI/SCSI MSC module
can have internal and external devices connected. The internal devices include
the RZ22 or RZ23 disk drive, the RRD40 compact disc drive (model 40 only),
the TZ30 tape drive, and the controller itseJf. The external devices include
the TKSOZ expansion box, the RZ55 disk expansion box, and the RRD40
compact disc expansion box.