Northern Telecom DMS-100 Series Maintenance Manual page 129

Procedure 4-45
Disk drive hardware error messages - procedures
6 Craftsperson Activity
(continued)
If:
·
the message occurs more than three times in
one hour, or,
·
the disk mode goes to ONLY mode
(non-redundant); perform the following steps:
a. Switch processors. If problem clears, replace the
Disk (SCSI Intf) Interface PCA in slot 11 of the
standby chassis
i) See Printed Circuit Assembly Replacement in
297-1001-536: DPP Card Replacement Guide .
ii) If the problem is not cleared after PCA
replacement and restart, go to step b. Return
the original PCA to its position before
proceeding.
b. Reinitialize the disk that is off-line.
Select:
i) The recommended procedure is Procedure 4-5.
ii) The alternate procedure is Procedure 4-6.
(When init activity is complete, go to step c.)
c. Change the disk mode to PRIME mode.
Enter:
>DISK MODE xx (cr)
Proper response
i) For any other response, see the procedure for
that message and perform the activities listed.
ii) If successful, procedure complete. (If
unsuccessful, go to step d.)
d. Switch processors.
(continued)
DPP Recovery and Routine Maintenance Guide BCS35 and up
Disk drive procedures 4-95
(at the terminal)
where: xx = disk mode
= AP = A PRIME
= BP = B PRIME
= DISK MODE: AP
or
DISK MODE: BP