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E.3.5.3 Stepper Pulley and Clamp Removal
See Figure E-34.
1.
Power down.
2.
Remove the drive band (see paragraph E.3.5.7).
3.
Measure and record the gap,
G '
between the
stepper motor pulley and the casting.
Gap is: _ _ _ _ _ _ _
4.
Loosen the clamp screw,
e ;
then remove the
pulley,
e '
and the clamp,
G .
E.3.5.4 Stepper Pulley and Clamp Replacement
See Figure E-34.
1.
Reinstall the pu"ey,
CD '
the clamp, "
' and the
clamp screw,
e.
The gap should be the same as
in step 3 of paragraph E.3.5.3. Ensure that the clamp
is even with the end of the stepper motor drive shaft.
2.
Reinstall the drive band. Go to Head/Carriage
Replacement (paragraph E.3.2.5, step 5).
E.3.5.5 Drive Band Service Check
See Figure E-34.
1.
Power down.
2.
Turn the stepper motor pulley by hand between
tracks 00 and 76.
3.
If the drive band does not track parallel to the pulley
edge,
G '
go to Drive Band Adjustment (paragraph
E.3.5.6, step 2).
If the band shows signs of physical damage,
G '
exchange the band (see paragraphs E.3.5.7 and
E.3.5.8).
E.3.5.6 Drive Band Adjustment
See Figure E-35, Parts 1 and 2.
1.
Power down.
2.
Remove the head connector,
G '
from the control
card.
3.
Remove the head cable guide,
0 .
4.
Place the head/carriage assembly,
e '
at track 40.
(Insert the timing pin,
0 '
into the timing hole in
the casting to al ign the
head/carriage
assembly,
e '
at track 40.)
5.
Loosen the three mounting screws," '
0 '
and
CD,
that attach the band to the pulley,
e '
and
the carriage bracket,
G .
6.
Tighten screw
G.
(Ensure that the band,
0 '
remains parallel to the carriage bracket,
G .)
7.
Tighten screw
O.
(Ensure that the band remains
parallel to the pulley edge,
4D .)
8.
Block the head/carriage assembly,
CD '
about 25 mm
(1 inch) from the end of the casting,
G).
9.
Pull on the loose end of the band
with
2.5
±
0.25
pounds' force,
G '
and tighten the screw,
CD .
(Ensure that the band remains parallel to the pulley
edge,
C!).
If it does not, repeat the adjustment,
starting at step 5.)
10.
Move the carriage to track 00 and then to track 76,
and ensure that the band,
0 '
tracks parallel to the
pulley edge,
0 .
11.
Adjust the head/carriage assembly,
CD
(go to
paragraph E.3.2.3, step 12).
E.3.5.7 Drive Band Removal
See Figure E-35, Parts 1 and 2.
1.
Power down.
2.
Remove the head connector,
G,
from the control
card.
3.
Remove the head cable guide,
G .
Observe the position of the band,
0 '
and clamp,
e '
before performing the next step.
Warning: The band,
0 '
is easily damaged,
0 .
Do
not bend, crease, or scratch the band.
4.
Remove the three mounting screws,
e '
G '
and
CD,
and the clamp,
e '
that attach the band,
0,
to the stepper motor pulley,
e '
and the carriage
bracket,
e.
5.
Remove the band assembly.
6.
If you have entered this procedure from Stepper
Pulley and Clamp Removal (paragraph E.3.5.3),
return to step 3 of paragraph E.3.5.3.
Appendix E. IBM 318D Diskette Drive Maintenance
E-4S
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