116 Disk Crossover and Controller circuit packs
297-1001-536 Standard 01.03 August 1996
Procedure 13–1
Replacing Disk XOVR circuit pack
Step
Description
Notes
CAUTION
Since all DPP circuit packs are static sensitive, be
careful when handling them.
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.
1
1
Wait for a low traffic period, if
possible.
Make sure no polling is taking
place.
2
Locate the failing Disk XOVR circuit
pack and change the disk mode to the
other disk ONLY mode, if necessary.
The other disk is the one not
in the same chassis as the
suspected Disk XOVR circuit
pack.
Enter: (at the terminal)
>DISK MODE xx (cr)
where:
xx = disk mode = AO = A ONLY
= BO = B ONLY
Proper response =
DISK MODE: AO
or
DISK MODE: BO
3
Loosen the slotted screws which
fasten the outer edges of the rear
panel assembly to the cabinet.
4
Remove the appropriate rear panel.
Wait for the disk mode
change to complete.
(continued)
