IBM 3270 Maintenance Manual page 551

2. Insert a scratch diskette into the diskette
drive.
3. Connect a jumper between test points 10 and
13 on the diskette-drive logic board.
4. Place the diskette drive (left side up) on the
system-unit power supply as shown below.
5. Plug the power connector into the
diskette-drive logic board; leave the signal
cable disconnected.
6. Plug the system-unit power cord into the
system unit, then into the outlet.
7. Set the system unit Power switch to On.
(Rear View)
5-601-lBMaintenance Information