Replacing Disk Drive - Northern Telecom DMS-100 Series Maintenance Manual

Replacing disk drive

The status of the disk drives changes to B ONLY immediately when the
main processor determines that the A disk drive has a non-recoverable fault
condition. Verify the status of the disk drives by entering the DISK (cr) and
MODE (cr) key sequence at the maintenance terminal. Make sure that the B
processor is in the ONLY mode by depressing the B processor control, then
the O control on the Switch and Status Panel and turn the mode switch key.
Examine the printouts on the maintenance terminal for verification of the
status change.
The only tool needed is a small flatblade screwdriver. See Procedure 4-8
and Procedure 4-9 for the disk drive replacement procedure.
Power up the new disk drive once it is fully installed. See Table 4-1 for
allowed disk drive mode changes. See Figure 4-1 during the replacement
procedure.
Note: The following procedure is for replacing the A disk drive; use the same
procedure for replacing the B disk drive by transposing the A and B references.
DPP Recovery and Routine Maintenance Guide BCS35 and up
Disk drive procedures 4-11