Digital Equipment VAXstation 3100 Maintenance Manual page 156

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Expansion Boxes 135
The TK50Z-GA expansion box must have the SCSI terminator installed if it
is the last box in the daisy chain.
6.1.1 Troubleshooting the RZ55 Disk Drive Expansion Box
To troubleshoot the RZ55 disk in the expansion box, use the self-test and
system exerciser diagnostics in the system box. Refer to Section 2.15.3
if
you
are not familiar with testing the devices on the SCSI bus.
Self-test results for the RZ55 disk drive should contain 00000001 in the SCSI
address ID location set by the switches on lhe back of the expansion box
(should be ID 1 and/or ID 0). A code of FFFFFF05 for the RZ55 indicates
that the device is not installed, not powered up, not connected to the SCSI
port properly, or faulty. A code of FFFFFFFF indicates that the device was
not tested because of a SCSI bus controller error. Any code other than those
previously listed indicates an error wilh the disk drive at that address ID
location, a cabling problem, or an error with the SCSI bus controller on the
MSC module. An additional RZ55 drive expansion box can be installed at
address ID 2 or 3 if no internal drives connect to these SCSI address IDs on
the external SCSI bus.
When running the system exerciser in Field Service mode, the code for the
disk drive shows that it is writable and that no errors are present (0200.0001
or 1200.0001 for SCSI IDs of 0 and 1). Any error code other than those
previously listed indicates an error is most likely on the disk, but never rule
out the possibility of an error on the SCSI bus controller itself.
If the tests indicate an error on the RZ55, perform the following steps:
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 on the system box, or to the previous expansion box, and to the back
of the RZ55 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 RZ55 expansion box from the daisy
chain or from the external SCSI port if no other boxes are connected.
Install the SCSI terminator on the external SCSI port, make sure the last
expansion box is terminated properly, and run self-test (TEST 6).