Drive Band Adjustment - IBM 5280 Maintenance Information Manual

363
DRIVE BAND ADJUSTMENT
1.
2.
3.
4.
5.
Power off.
Disconnect the head cable connector
II
from the
diskette drive control card
1m
and remove the head
cable from the cable guide
1m.
Remove the cable guide
1m.
Place the head/carriage assembly
m
at
approximately track 40.
Insert the timing pin
IJ
into the timing hole in the
pulley and the casting to align the head/carriage
assembly at track 40.
CAUTION
The drive band assembly can be easily damaged. Do not
bend, dent, or scratch the drive band.
6. Loosen the three mounti ng screws
D, II,
and
II
that attach the drive band
II
to the pulley
fJ
and
the carriage bracket
II.
40 Stepper Drive
363
7.
Tighten the screw
II.
Ensure that the drive band
is parallel to the carriage bracket when the screw
is tight.
8. Tighten screw
D.
Ensure that the drive band is
parallel to the edge of the pulley when the screw
is tight.
9. Block the head/carriage about 25 mill imeters (1
inch) from the end of the casting
m.
10. Use the force gauge
III
(part 460870) to pull on
the loose end of the drive band with 2.5 ± 0.25
pounds of force and tighten the screw
II.
Ensure
that the drive band remains parallel to the carriage
bracket. If the drive band does not remain parallel
to the carriage bracket, return to step 6.
11. Move the carriage back and forth by hand and
ensure that the drive band stays parallel with the
edge of the pulley.
12. Go to 339, step 12.