Service manual

114 System Tests
CONTROLLER OR DRIVE PROBLEMS
The following errors could be controller or drive problems. They will occur
in the 2nd, 3rd, or 4th line of the error report:
XZYY.ST81 Restore Error
XZYY.ST91 Step Error
where:
X = Drive number
Z = Drive status
YY = Error count
S = Chip status
T = Termination code (this must be a nonzero value)
If these errors only occur on one drive in a multidrive system, then the
error is probably in the drive. If these errors occur on all the drives, then
the error is probably in the controller. There was a bug in the earlier
versions (REV J and back) that reported a RESTORE ERROR with a
termination code equal to 0. This should be fixed in the later versions.
If you see this error in versions after REV J, report it to the diagnostic
group.
CONTROLLER OR MEDIA PROBLEMS
This error could be a problem with the media or the controller. It will be
seen on the 1st line of the error report:
XFYY.0001 CRC/ECC error
where X is the transfer unit and YY is the error count.