Digital Equipment VAXstation 3100 Maintenance Manual page 176

Expansion Boxes 155
When running the system exerciser in Field Service mode, the code for the
TK50Z expansion box shows that it is removable, but not writable during the
first pass (5100.0001 for SCSI ID of 5). During the second and subsequent
passes, the code should indicate that it is removable and writable (5300.0001)
as long as the special-keyed diagnostic tape is properly loaded. If the special-
keyed tape is not loaded, the 5100.0001 code indicates no errors. Any error
code other than those previously listed indicates an error is most likely on the
TK50Z expansion box, but never rule out the possibility of an error on the
SCSI bus controller itself.
If the test results indicate a problem in the TK50Z expansion box, the problem
could be the TKSO
tape
drive, the TZK50 controller board, the power supply,
the MSC module in the system box, the SCSI ID switch board, or the SCSI
cabling. Perform the following steps to troubleshoot the TK50Z expansion
box:
1. Make sure the expansion box has power and is switched on.
2. Make sure the SCSI port cable connects properly to the external SCSI
port, or to the previous expansion box, and to the back of the TK50Z
expansion box.
3. Make sure the SCSI terminator installs on the unused connector on the
back of the box or that the cable secures the next daisy-chained box.
4. Run the tests again.
5. If the problem returns, disconnect the TK50Z expansion box from the
daisy chain or from the external SCSI port if no other boxes are connected.
lnstaJJ the SCSI terminator on the external SCSI port, and make sure the
last expansion box properly terminates. Run self-test (TEST 6).
6. If the status code is not FFFFFF05 for the address ID of the TK50Z
expansion box (normally address ID 5), check the SCSI address IDs of
all drives on the SCSI bus for proper settings. If the address IDs are set
correctly, replace the MSC module.