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Part Number 8519184-0000 Rev: B
2.
The mid-plane (backplane) board is located approximately in the middle of the enclosure and
connects the drives to the host connection board. This board is not a FRU and is only repaired
by returning the enclosure to Trimm. Generally, this board does not contain any active
components. However, it does contain LED’s, terminator power diodes and fuses.
3.
The alarm board is accessible from the rear of the enclosure. (There are two types; one in the
standard JBOD; and one for the JBOD connected in a castle (UR16R) configuration). (The
second type (UR16R) does not have a Saf-Te option as it uses a different communications
method). To remove, undo the mounting screws and pull the board out, using the metal lip
that is mounted at the rear of the board. This board contains the audible alarm circuit. The
board is a FRU. Generally, any active components that are within the enclosure are mounted
on this board. Also, the optional Saf-Te board is mounted on this board as a daughter board.
IF the optional Saf-Te board is installed, then the alarm board CANNOT be removed
from the rear, until and unless the Saf-Te board is removed.
4.
The optional Saf-Te board is connected as a daughter-board to the alarm board via two
headers and is also connected to a drive channel via a separate connector. The Saf-Te board
has provisions for setting the address of the Saf-Te device to either SCSI ID 4 or 5 via an on-
board jumper, using jumper P3 (reference Figure 5). To replace the Saf-Te board requires
removing the top cover from the enclosure. With the top cover removed, lift the Saf-Te board
off of the alarm board (connected via two headers) and remove the cable connector (this
connector off disables the Saf-Te device from communicating on the SCSI bus. This board is
a FRU.
Figure 5
Saf-Te Daughter Board Option Connected to Alarm Board
P3 location for SCSI-ID jumper
OFF = 4
ON = 5
Cable connector connecting Saf-Te
to Drive Channel 1
Connectors, connecting Saf-Te
daughter board to Alarm Board
