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E.3.4.5 Drive Fan and Pulley Assembly Removal
See Figure E-32.
1.
Power down.
I
DANGER
Voltage is still present at the socket when the
power cable,
G '
is disconnected.
2.
Remove the ac drive belt,
CD .
3.
Remove the fan enclosure mounting screws,
G '
and remove the fan enclosure,
G .
4.
Loosen the setscrew,
G;
then remove the ac drive
motor pulley/fan,
0 .
E.3.4.6 Drive Fan and Pulley Assembly
Replacement
See Figure E-32.
1.
Reinstall the ac drive motor pulley,
0 '
on the
motor shaft so that the setscrew,
G,
is centered
in the flat surface of the shaft. (Leave the setscrew
loose.)
2.
Position the fan and pulley on the motor shaft with a
gap of 0.5 mm ± 0.1 mm (0.020 ± 0.004 inch)
between the motor face and the fan hUb. Tighten the
setscrew.
3.
With the mounting screws,
0 '
reinstall the fan
enclosure,
(3 ,
with the belt clearance slots toward
the drive hub,
G.
4.
Reinstall the drive belt,
e.
5.
Reconnect the ac drive motor power cable,
G .
6.
Power up.
E.3.5 Stepper Drive Parts
E.3.5.1 Stepper Motor Removal
See Figure E-33.
1 .
Power down.
2.
Remove the head cable connector,
0 '
from the
control card.
3.
Remove the head cable guide,
G.
Warning: The stepper drive band,
e,
assembly can be
easily damaged. Do not bend, crease, or scratch the band.
4.
Remove the three mounting screws,
0 ' 0 '
amI
•
' and clamp,
e '
that attach the stepper driw
band,
e '
to the stepper motor drive pulley,
e '
and carriage bracket,
G.
(Note the position of the
band,. ' and clamp,
G '
for easier replacement.)
5.
Remove the band assembly.
6.
Measure and record the gap,
CD '
between the
stepper motor pulley,
e '
and the casting for later
use.
Gap is _ _ _ _ _ _ _ _
7.
Loosen the stepper pulley clamp screw,
CD '
and
remove the stepper pulley,
e '
and the clamp,
0 .
8.
Remove the stepper motor cable connector,
0 '
from the control card.
9.
Remove the four stepper motor mounting screws,
e.
10.
Remove the stepper motor,
G .
E.3.5.2 Stepper Motor Replacement
See Figure E-33.
1.
Reinstall the stepper motor,
G
,using the four
mounting screws,
0 .
(Locate the motor cable
toward the control card.)
2.
Reinstall the stepper motor cable connector,
0 '
on the control card.
3.
Reinstall the stepper motor pulley,
e '
and the
clamp,
CD.
(Adjust the gap,
0 '
between the
pulley and the casting to the measurement recorded
in step 6 of" paragraph E.3.5.1.) The clamp,
CD '
should be placed even with the end of the stepper
motor drive shaft,
e .
4.
Reinstall the drive band, • . Go to Head/Carriage
Replacement (paragraph E.3.2.5, step 5).
Appendix E. IBM 31SD Diskette Drive Maintenance
E-43
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