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9.2.9 Forms Tractor Unit Chain
Removal
1.
2.
3.
4.
Remove the forms tractor unit (9.2.7).
Locate the pin that holds the chain together.
Move the pin to the back side and remove
the C-clip
a.
Slide the removable pin from the chain. The
chain tensioner and spring might fall out.
To reinstall a chain, reverse the procedure.
Left Tractor
Assembly
5.
Chain
Tensioner
Machines equipped with an adjustable left
tractor should follow this procedure. With
the left tractor in the leftmost position, adjust
the collar
II
to allow 0.200 inch ± 0.010
inch (5.08 mm ± 0.25 mm) movement of the
tractor.
_1_
0.200 inch
±
0.010 inch
(5.08 mm ± 0.25 mm)
9.2.10 Platen Gear Backlash
Adjustment
Idler and platen gears should have a slight back-
lash throughout their rotation.
1.
2.
Turn power off at the operator control
panel.
Remove the printer cover (9.2.1).
3.
Loosen the forms feed motor/emitter mount-
ing screws
m.
4.
Position the stepper motor up and back to
provide slight backlash from platen gear to
idler gear, 0.000 inch to 0.006 inch (0.00
mm to 0.15 mm) estimated at several loca-
tions on the platen gear
B.
Use a screw-
driver as shown
II
to prevent the motor
idler gear from moving when checking for
backlash.
./
~
/
I
/
, /
5.
6.
".
/ '
9-20
Tighten the mounting screws and check for
binds and minimum backlash at several lo-
cations on the platen gear.
Reinstall the printer cover (9 .. 2.1).
/ "
, , - /
,,-
Mounting
Screws
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