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BMC II BISYNC Quick Reference Guide
Disk Replacement Procedure
Removing the Faulty Disk Drive
Procedure 2
Remove faulty disk drive
Step Description
Note 1: The following procedure is for replacing the A disk drive; use
the same procedure for replacing the B disk drive by transposing
references to A and B disks.
Note 2: The DSK command syntax shown is required when not already
in the DSK overlay. If the printer is at the DSK> prompt, the DSK part
of the command can be omitted. The DSK overlay can be exited by
entering (CNTRL) Z (cr) or any entry that results in an ILLEGAL
COMMAND response.
CAUTION
Since all BMC PCAs are static sensitive, be careful when
handling them. Wear a wrist grounding strap when working
with the BMC.
WARNING
Since the BMC is powered up during this procedure,
observe all safety procedures for operations on live equip-
ment.
1 To remove the front panel of the BMC (BISYNC), loosen the
four screws located on the left and right hand sides. Once
removed, put the front panel in a safe place to avoid damage,
bending and scratching.
2 For the side that is operating in an ONLY disk mode, make sure
that the other processor is active. The other processor is defined
as that processor that does NOT have the failing disk drive in its
chassis. Depress the rocker switches on the status panel to
ONL and A or B, matching the other processor defined above.
Turn the key switch and observe that the ONL and PRI lamps
are lit for the processor that does NOT have the failing disk.
Determine the current disk mode:
>DSK MOD (cr)
DISK MODE: AO
A ONLY DISK MODE
DISK MODE: BO B ONLY DISK MODE
DISK MODE: AP A PRIME DISK MODE
DISK MODE: BP B PRIME DISK MODE
i.e., If the disk mode is AP or BP, and the disk in the A chassis
is the suspected bad drive, change the disk mode to B ONLY:
Enter (at the terminal):
>DSK MOD BO (cr)
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