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9.2.11 Forms Feed Motor Gear Backlash
Adjustment
1.
2.
3.
4.
Turn'power off at the operator control
panel.
Separate the printer from the power supply
and place the printer in the service position
(9.2.2).
Remove the forms feed motor/emitter
assembly (9.2.12).
Loosen the screws and the nut (bolt head
access through hole in the idler gear) that
holds the emitter base on the stepper
motor
Pl.
Mounting
Screws (3)
and Bolt (1)
Base
5.
Rotate the base
II
on the motor to obtai n
slight backlash, 0.001 inch to 0.006 inch
(0.025 mm to 0.15 mm) estimated, between
idler gear
II
and the motor gear
m .
CAUTION
Too little backlash can cause breakage of
the mounting stud for idler gear
Ii .
6.
Check backlash in several positions of the
idler gear.
7.
Tighten screws and nut.
8.
Check backlash and readjust if necessary.
9.
Reinstall the forms feed motor/emitter
assembly.
10.
Adjust platen gear backlash (9.2.10).
11.
Reassemble the printer and power supply
(9.2.2).
9.2.12 Forms Feed Motor/Emitter
Removal
1.
2.
3.
4.
5.
6.
7.
8.
Turn power off at the operator control
panel.
For installation, if the motor/emitter was
disassembled, perform the forms feed motor/
emitter timing (9.2.15).
For installation, adjust the platen gear back-
lash (9.2.10).
Unplug the forms feed emitter amplifier
card
&J.
Unplug the motor leads from TPB2
[i.
Separate the printer from the power supply
and place the printer in the service position
(9.2.2).
While supporting the forms feed motor/
emitter assembly, remove three mounting
screws
II
from the right side frame.
Idler Gear
Remove the motor/emitter assembly. To
remove any parts from the motor/emitter
assembly, disassemble it, as required
(9.2.13).
1
A mark on the P4 and P5 connectors indicates position
1. Always plug the marked side of P4 and P5 to face
away from the board.
2
This card is not mounted on new style forms feed
motors.
m
Motor Gear
9.
To reinstall the motor/emitter assembly,
reverse the procedure.
BluelWhite
RedlWhite
Red _ _ .........
White---.....~
Black
Blue
Frame
Forms Feed
Emitter
Amplifier
Card
2
Serial Printer
·9-21
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