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4.6.31 Ribbon Drive Belt
Adjustment
Note:
Too much tension on the belt causes
excessive wear on the bearings.
1.
Remove the printer covers (4.6.1) steps 1
through 3.
2.
Remove the type belt (4.6.13), the type
belt drive pulley assembly (4.6.14), and the
ribbon cassette.
3.
Using a gram gauge, check that a 100
gram force causes 0.120 inch ± 0.030
inch (3.05 mm ± 0.76 mm) deflection mid-
way between the pulleys
a .
4.
Adjust by loosening the three ribbon drive
mounting screws and moving the assembly
right or left.
5.
Tighten the screws, then verify the deflection
in step 3.
6.
Install the pulley, type belt, ribbon cassette,
and cover(s).
7.
The ribbon drive belt should track on the
pulley so that there is at least one sixteenth
of an inch between the belt and the motor
top plate. To increase the clearance, add
shims under the rear edge of the ribbon
mounting bar assembly.
n
[
'~
1/16 inch
clearance
1
Removal
I
DANGER
A spring within the clutch mechanism can fly
out when disassembling the clutch. Hold the
bracket toward the floor and release the spring
tension slowly.
1.
Remove the printer covers.
2.
3.
4.
5.
6.
7.
8.
9.
Remove the ribbon cassette (4.6.28) and
type belt (4.6.13).
Remove the type belt drive pulley assembly
(4.6.14).
Remove the ribbon drive assembly (4.6.29).
Remove the screw
mJ
from the top of
the drive shaft.
Remove the drive rolls
[!t,
gear
m,
and the washer beneath the gear from
the shaft.
Remove the plate by removing three
screws
iii.
Remove the C-clip
III ,
and slide the
clutch pivot shaft
OJ
out of the clutch
arm.
Remove the bottom half of the clutch
D
and the washer from the drive shaft.
4-128
10.
Remove the drive shaft from the bottom.
11.
Remove the pulley, washer, and belt
II .
Replacement
1.
Place the washer on top of the ribbon drive
pulley. Use a small amount of grease to keep
the washer in place.
2.
Place the belt around the ribbon drive pulley,
and insert it in the ribbon drive assembly.
3.
Insert the drive shaft through the bottom of
the ribbon drive assembly and through the
ribbon drive pulley.
4.
Replace rem:lining ribbon assembly parts in
the reverse order of removal.
Note:
Screw
m
must be tight, or drive
rolls may slip on drive shaft.
5.
Install the ribbon drive assembly on the
print unit. Do not tighten mounting
screws.
6.
Perform ribbon drive belt tension adjust-
ment (4.6.31).
7.
Install remaining units in reverse order
(steps 3 through 1) of removal.
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