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4.6.33 Ribbon Drive Rolls and Idler Rolls
(285Ipm)
Removal
Note:
Both the ribbon drive rolls
m
and the
pressure roll bracket assembly
mI
should be
replaced at the same time.
1.
Remove the idler rolls:
a. Remove the screw
iii .
b. Remove the spring
m
and bracket
mi.
c. Remove the lower screw
m .
d. Remove the upper spring clip
II .
e. Remove the upper spacer
II .
f. Remove the lower clip
II .
g. Push upper bearing
m
off the upper end
of the shaft.
h. Remove the idler roll shaft assembly
II
with the lower spacer
m .
Note:
The lower bearing should stay in
the bracket.
2.
Remove the drive rolls
m .
a. Remove screw
II .
b. Slide the rolls off the drive shaft.
Replacement
1.
2.
Replace the drive rolls
m :
a. I nstall the drive rolls on the drive shaft.
b. Tighten the screw
II .
Note:
Screw
II
must be tight, or drive
rolls may slip on shaft.
Replace the idler rolls:
a. Install the lower spacer
m
on the shaft.
Be sure the shoulder is up.
b. Install the pressure roll shaft assembly
into the lower bearing.
c. Install the upper bearing
m .
d. Install the lower clip
II
under spacer
m.
e. Install the upper spacer
II
with the
shoulder down.
f. Install the upper clip
II.
g. Install screw
m .
h. Install the bracket
mI,
spring
m '
and
screw
II.
4.6.34 Ribbon Drag (285 Ipm)
Service Check
1.
Remove the ribbon cassette and pull about
7 inches (177.8 mm) of ribbon from the
right end of the cassette.
2.
Make a loop in the ribbon as shown at
m
and place a paper clip toward the end of
the loop.
3.
Insert the gram gauge blade in the loop, hold
it at the angle shown, and slowly move the
gauge to the right. The ribbon should start
pulling out of the cassette when 25 to 35
grams of pressure is applied. If more than
35 grams or less than 25 grams is required
to pull the ribbon, install a new cassette.
4-130
Ribbon Cassette
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