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4.6.21 Impression Singleshot
Potentiometer (285 Ipm)
Adjustment
1.
2.
3.
4.
5.
Set the forms thickness control to 6.
Load Program ID PRT3, and select option 2.
Loosen the screw
II
and adjust the
potentiometer
m
to indicate a high
between 407
J1.S
and 423
J1.s.
Set the forms thickness control to 1; the
display should indicate a low between 140
J1.s
and 225
J1.s.
Readjust as necessary to obtain the values
in steps 3 and 4. If the potentiometer cannot
be adjusted within the tolerances, replace
the potentiometer, then adjust it.
Removal
1.
Turn the power off. Open the printer
covers.
2.
3.
4.
5.
6.
Loosen the nut
II
and pull the cover
a
off the potentiometer shaft.
Unplug the impression potentiometer
plug P5 or P13.
Note: Some potentiometers use P13;
others use P5-3 and 4. If P5, remove poten-
tiometer terminals 3 and 4.
Loosen screw
II
and remove two screws
m·
Remove the. potentiometer and bracket
assembly.
Slide the arm off the shaft. Remove nut
II
and remove the potentiometer from
the bracket assembly.
D--~
m--~~~r~~~~--~~~
Replacement
1.
Assemble the potentiometer to the
bracket assembly and the arm to the
shaft.
2.
3.
4.
5.
6.
7.
Move the forms thickness control to the
extreme left.
Install the bracket assembly and align
number 1 on the scale to the forms thick-
ness control
II
and tighten the two
mounting screws
m .
Move the forms thickness control to 4.
Connect an ohmmeter to leads 3 and 4 and
adjust the potentiometer
II
for 5000
ohms. Tighten the screw
II
slightly.
Install the terminals in the plug if needed.
Replug the connector.
Perform the potentiometer adjustment
(4.6.21). After the adjustment is made,
check for a gap between the arm and bracket
and tighten the screw
II .
Belt Printer
285 Ipm
4-119
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