Digital Equipment VAXstation 3100 Maintenance Manual page 171

150 Expansion Boxes
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-
GA bas the switch). The TK.SOZ-FA expansion box must be disconnected and
the RRD40 expansion box
must be connected between the external SCSI
port and the TK50Z-FA expansion box. The TK50Z0-FA expansion box
has termination resistors installed inside its box; therefore, the TK50Z-FA
expansion box must be installed at the end of the daisy chain. The TK50Z-GA
expansion box does not have tJ1e 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 last box in the daisy chain.
POWER
INDICATOR
ACTIVITY
INDICATOR
Figure 6-i6 RRD40 Compact Disc Expansion Box
MIA·XOl715-H
6.2.1 RRD40 Compact Disc Expansion Box Troubleshooting
To troubleshoot the RRD40 compact disc expllnsion box, use the Relf-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 RRD40 box should contain 05000001 in the SCSI
address location
set by the switches on
the back of the expansion box
(should be ID 4). A code of FFFFFFOS for the RRD40 box indicates that
the box is not instailed, not powered up, not connected to the external SCSI
port properly, o.r faulty. A code of FFFFFFFF indicates that the device was
not tested because of a SCSI bus controller error. Ally code other than those
previously listed indicates an error with the RRD40 compact disc expansion
box at that address ID location (should be ID 4 ), a cabling problem, or an
error with the SCSI bus controller on the MSC module. All additional RRD40
expansion box installs at address ID 1 or 0 if no other external boxes connects
to these SCSI address IDs on the extema SCS bus.