Digital Equipment VAXstation 3100 Maintenance Manual page 157

136 Expansion Boxes
6. If the status code is not FFFFFF05 for the address ID of the RZ55
expansion box (nonnally address ID 1 or 0) , check the SCSI address
IDs of all drives on the bus for proper settings. If the address IDs are set
correctly, replace the MSC module .
7. If the status code is FFFFFF05, check the address ID switch on the back
of the RZ55 expansion box to make sure it is set properly. Refer to
Figure 6-13 for proper SCSI ID switch settings.
8. If the address ID and drive select jumpers are set properly, a fault in the
RZ!IJ5 expansion box exists.
9. Remove the cover to the expansion box and check the internal cabling for
good connections.
10. Power up the expansion box and listen for the fan and the drive to spin
up. If the fan does not spin or the drive does not bum, replace the power
supply, reconnect the box to the SCSI port, and retest.
I erates nonnall re lace the RZ55 electronics
module, reconnect the box to the SCSI port, and retest.
12. If replacing
the RZ55 electronics module did not fix the problem, replace
the whole RZ55 drive, reconnect the box to the SCSI port, and retest.
13. If
replacin~
the RZ55 drive did not fix the problem, replace the SCSI
switch module, reconnect the box to the SCSI port, and retest.
14. If replacing the SCSI ID switch module did not fix the problem, replace
the resistor load board, reconnect the box to the SCSI port, and retest.
15. If a problem still exists, check the internal SCSI cable's connector for
damaged pins or cut wire . Cheek the external SCSI cable for damaged
connector pins or cut wires. Then replace the MSC module in the system
box if the cables appear normal,