Northern Telecom BCS35 Replacement Manual page 148

132 SCSI Crossover circuit pack
Procedure 14–1
SCSI XOVR circuit pack replacement
Step
1
2
3
4
297-1001-536 Standard 01.03 August 1996
Description
CAUTION
Since all DPP circuit packs are static sensitive, be
careful when handling these materials.
Wear a wrist grounding strap when working with the
DPP. Jacks at the lower right of the Rover Interface
panel (B chassis) and the lower right of the Switch and
Status Panel (A chassis) are provided to accept the
banana plug connection on the end of a grounding strap.
WARNING
Since the DPP is powered up during this procedure,
observe all safety procedures for operations on live
equipment.
Wait for a low traffic period, if
possible.
Locate the failing SCSI/XOVR circuit
pack and change the disk mode to the
other disk ONLY mode, if necessary.
Enter: (at the terminal)
>DISK MODE xx (cr)
where:
xx = disk mode = AO = A ONLY
= BO = B ONLY
Loosen the slotted screws which
fasten the outer edges of the rear
panel assembly to the cabinet.
Remove the appropriate rear panel.
Notes
1
Make sure no polling is taking
place.
The other disk is the one not
in the same chassis as the
suspected SCSI/XOVR circuit
pack.
Proper response =
Wait for the disk mode
changed to complete.
(continued)
DISK MODE: AO
or
DISK MODE: BO