IBM 3270 Maintenance Manual page 216

1.
Remove the diskette.
2. Set the Power switch on the system unit (and
expansion unit, if attached) to Off for 5
seconds.
'3. Set the Power switch on the expansion unit
(if attached) and the system unit to On.
4. Observe the spindle during POST.
Spindle
I
FiJI
.F=t
-
.ll
U
II
j
U
r--tf::::: -~
.\ \
In-.~I
@
Front View-Diskette Drive
DID THE SPINDLE ON DRIVE A BEGIN TO
rROTATE BEFORE THE "BEEP" AT THE
END OF POST?
NO Go to page.3-600-28.
YES
October 1984 3-600-17