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4.2.21 Impression Singleshot Potentiometer
(50, 100, and 155 Ipm)
Adjustment
1.
2.
3.
4.
5.
6.
Set the forms thickness control to 4.
Load Program 10 PRT3, and select option
2.
Loosen the screw
II
and adjust the
potentiometer
m
to indicate between
427
IlS and 443 IlS.
Check adjustment by setting the forms
thickness control to 3; the display should
indicate between 327 IlS and 361 IlS.
Set the forms th ickness control to 1; the
display should indicate between 221 IlS
and 3021ls. Readjust as necessary to
obtain the values in steps 3 and 4.
If the potentiometer cannot be adjusted
within the tolerance, replace the potentio-
meter and adjust it.
Removal
Replacement
1.
2.
3.
4.
5.
6.
Turn the power off. Open the printer
covers.
Loosen the nut
B
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.
1.
2.
3.
4.
5.
6.
7.
Assemble the potentiometer to the
bracket assembly and the arm to the
shaft.
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 th ickness control to 4.
Connect an ohmmeter to leads 3 and 4 and
adjust the potentiometer
m
for 5000
ohms. Tighten the screw
g
slightly.
Install the terminals in the plug if needed.
Replug the connector.
Perform the potentiometer adjustment
(4.2.21). After the adjustment is made,
check for a gap between the arm and
bracket and tighten the screw
IJ .
rl--..r
m----~~~J~~~~--~~~
Belt Printer
50, 100, and 155 Ipm
4-41
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