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4.2.33 Ribbon Drive Rolls and Idler Rolls
(50, 100, and 155 Ipm)
Removal
Note:
Both the ribbon drive rolls
m
and the
pressure roll bracket assembly
II
should be
replaced at the same time.
1.
Remove the screw
III
on the pressure roll
bracket assembly.
2.
Remove the spring
rl
and the bracket
assembly
II .
3.
Remove screw
Ii
and lift the drive rolls
II
from the drive shaft.
Replacement
1.
Install the pressure roll bracket assembly
II·
2.
Install spring
II
and screw
II .
3.
Install the drive roll as shown at
II
and
tighten screw
m .
Note:
Screw
II
must be tight, or drive rolls
may slip on drive shaft.
4.2.34 Ribbon Drag (50, 100, and 155 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
II
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 between 45 and 65 grams of pres-
sure is applied. If more than 65 grams or
less than 45 grams is required to pull the
ribbon, install a new cassette.
11118"
Ribbon Cassette
Belt Printer
50, 100, and 155 Ipm
4-51
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