IBM 7012 300 Series Installation And Service Manual page 44

Step 1
(from Steps 3, 7, 8, 9, and 14)
1. Ensure that the diagnostics and the operating system are shut down.
2. Turn the key mode switch to the Service position.
3. Set the power switch on the system unit to Off.
4. Insert the first diagnostic diskette into the diskette drive.
5. Set the power switch on the system unit to On.
6. Find the symptom in the following table that best matches the symptom on your system,
and then perform the associated task.
Information in
three-digit dis-
Nothing
c07
888 flashing
Two or more num-
bers between 221
and 296 are dis-
played alternately.
c31
c05
299 or less
300 or greater
570
Any symptom not listed above.
2-1540-2
Installation and Service Guide
play
Diagnostic Operating Screen is displayed
The diskette drive "In-Use" light is on
First diagnostic diskette is loaded
Instructions to select the system console
displayed on the screen.
The diskette drive "In-Use" light is on
Digits on solid for more than 3 minutes,
and the power light is on.
Digits on solid for more than 3 minutes,
and the power light is on.
Digits on solid for more than 3 minutes,
and the power light is on.
Other conditions Do this:
Go to Step 14.
Insert the next diagnostic
diskette.
Wait for one of the other
symptoms in this table to
occur.
Go to Step 2.
Go to Step 7.
Follow the instructions on
the screen. Wait for one of
the other symptoms in this
table to occur.
The diagnostic diskette is
probably bad. Insert the
same diskette from a du-
plicate diagnostic set. If
the duplicate diskette
causes the same symp-
tom, Go to Step 7.
Go to Step 2.
Go to Step 7.
Down level SCSI-2 code.
Run diagnostics with re-
movable media.
Go to Step 2.