IBM 5280 Maintenance Information Manual page 146

Page of SY31'()602-0
As updated 5 June 1981
By TN L SN20-9529
Stepper Drive
357
STEPPER MOTOR REMOVAL AND
REPLACEMENT
Removal
1.
2.
3.
Power off.
Disconnect the head cable connector
lEI
from the
diskette drive control card
1m
and remove the head
cable from the cable guide
1m .
Remove the cable guide
1m .
CAUTION
The drive band assembly can be easily damaged. Do not
bend, dent or scratch the drive band.
4.
Remove the three screws
II, II '
and
IJ
and the
clamps
0
and
II
that attach the drive band
II
to
the stepper motor pulley
fJ
and carriage bracket
II.
(Note the position of the drive band and clamps
for the replacement procedure).
5. Remove the drive band.
6. Measure and record the gap
II
between the stepper
motor pulley and casting.
Thegapis ____________________ __
7. Move the stepper. motor pulley
fJ
by hand to track
40 and insert the timing pin
1m .
8. Loosen the screw
1m
and remove the stepper motor
pulley
fJ
and the clamp
IJ·
I
9. Disconnect the stepper motor cable connector
m
from the diskette drive control card.
36 Stepper Drive
10. While holding the pulley and timing pin, remove the
stepper motor mounting screws
III.
11. Remove the stepper motor
III.
Replacement
1.
2.
Reinstall the stepper motor by using the mounting
screws. (Ensure that the stepper motor cable faces
toward the diskette drive control card
lID .)
Reconnect the stepper motor cable connector
OJ
to
the diskette drive control card
1m.
3. Reinstall the stepper motor pulley and the clamp.
(Adjust the gap
IDto
the dimension 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.
14.
Go to 365, step 1 (Drive Band Replacement).
357