Replacement; Removal - IBM 5280 Maintenance Information Manual

Stepper Drive
357
STEPPER MOTOR REMOVAL AND
REPLACEMENT
Removal
1. Power off.
2.
3.
Disconnect the head cable connector
m
from the
diskette drive control card
1m
and remove the head
cable from the cable guide
1m .
Remove the cable guide
Em .
CAUTION
The drive band assembly can be easily damaged. Do not
bend, dent or scratch the drive band.
4. Remove the three screws
II, 0,
and
II
and the
clamps
0
and Dthat attach the drive band
II
to
the stepper motor pulley
fJ
and carriage bracket
D·
5. Remove the drive band.
6. Measure and record the gap
m
between the stepper
motor pulley and casting.
Thegapis ______________________ _
7. Loosen the screw
1m
and remove the stepper motor
pulley
fJ
and the clamp
fJ.
8. Disconnect the stepper motor cable connector
ID
from the diskette drive control card.
36 Stepper Drive
357
9.
Remove the four stepper motor mounting screws
ie·
10. Remove the stepper motor
IE].
Replacement
1.
2.
3.
Reinstall the stepper motor by using the four mount-
ing screws. (Ensure that the stepper motor cable
faces toward the diskette drive control card
il!].)
Reconnect the stepper motor cable connector
1m
to
the diskette drive control card
lID.
Reinstall the stepper motor pulley and the clamp.
(Adjust the gap
Ii
to the di mension recorded in the
removal procedure step 6.)
CAUTION
The drive band assembly can be easily damaged. Do not
bend, dent, or scratch the drive band.
4. Reinstall the drive band (see 365).
5. Go to 341, head carriage replacement procedure,
step 5.