IBM 3270 Maintenance Manual page 553

9. Set the system unit Power switch to Off.
10.
Unplug the system unit power cord from the
outlet.
11.
Disconnect the power cord from the rear of
the system unit.
12.
Install the diskette drive (5-601-4) or
(5-601-8).
13. Turn to "Drive Motor Speed Adjustment"
(5-601-21) and verify the speed is within
specification. Adjust if necessary.
14. Install the cover of the system unit (5-100-3).
15.
Connect all cables.
5-601-20
Maintenance Information