IBM 3270 Maintenance Manual page 555

5. Set the Power switch on the system unit (and
expansion unit, if attached) to Off.
6.
Set the Power switches on all attached
devices to Off.
7.
Unplug the power cord of the system unit
(and expansion unit) from the outlet.
8.
Disconnect all cables from the rear of the
system unit.
9. Remove the cover of the system unit
(5-100-2).
10.
Remove the two mounting screws on the
diskette drive that needs adjusting (5-601-2)
or (5-601-6).
5-601-22
Maintenance Information