Digital Equipment VAXstation 3100 Maintenance Manual page 175

154 Expansion Boxes
EXTERNAL
SCSI CABLE _
_._.Jr
TKSOZ·OA
~~~ANBION --1-...>tt--H-~H++----_.
Figure 6-19 TK50Z Expansion Box Connection
ML0-000081
MA-X1171·H
One exception is when the TK50Z-FA expansion box connects to the SCSI
port (expansion box without a SCSI ID switch on the back of the box, the
- - - - - - - 'TK:50Z-6 · has the-switch).- The...!fKSO Z F. expansion-box- ha termination- - - - - - -
resistors installed inside its box. The TK.50Z-FA expansion box must be
installed at the end of the daisy chain. The TKSOZ-GA expansion box does
not have the resistors installed and can be anywhere in the daisy chain. The
TK50Z-GA expansion box must have the SCSI terminator installed if it is the
Inst hnx in the cfaisv
chain.
-
.
6.3.1 Troubleshooting the TKSOZ Expansion Box
To troubleshoot the TK50Z expansion box, use the self-test and the 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 TK50Z expansion box should contain 01000001 in
the SCSI address ID location of the box (normally address ID 5). The SCSI
address ID is set by the switches on the back of the expansion box for the
TK50Z-GA version or set by jumpers on t.he TZK.50 controller board inside
the box for the TK50Z-FA version. A code of FFFFFF05 for the TK50Z
expansion box address ID indicates that it is not installed, not powered up, not
connected to the external 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 with the TK50Z
expansion box at that address ID location, a cabling problem, or an error with
the SCSI bus controller on the MSC module.