Northern Telecom DMS-100 Series Maintenance Manual page 122

4-88 Disk drive procedures
Procedure 4-43
Disk drive hardware error messages - procedures
5 System Recovery Action
6 Craftsperson Activity
297-1001-537 Standard 01.02 December 1993
DPP disk system reattempts self-test.
a. Power down the suspect disk by pulling J8.
b. Switch processors; then replace the Disk (SCSI
c. Initialize the disk.
CAUTION
Improper performance of this procedure may cause a loss of data.
Make sure the operational disk drive is in DISK ONLY mode
before entering commands.
(continued)
(continued)
i) Wait for drive to stop completely before
continuing to step b.
ii) Reapply power to the disk.
iii) Wait for the (disk) system to perform self test.
iv) Determine the current disk operating mode.
Enter: (at the terminal)
>DISK MODE (cr)
Proper response =
DISK MODE: AP or
DISK MODE: BP
v) If self test fails this second try, go to step b.
Intf) Interface PCA in slot 11 of the standby
chassis.
i) See Printed Circuit Assembly Replacement in
297-1001-536: DPP Card Replacement Guide .
Switch back to processor w/new Disk Interface.
ii) If the problem is not cleared after PCA
replacement and restart, go to step c. Return the
original PCA to its position before proceeding.
iii) If successful, go to step c. (If unsuccessful, go
to step e.)