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4-5. Slide Potentiometer Replacement
Tools Needed:
5/64 in
4-6. Troubleshooting
Trouble
Unit completely inoperative.
Unit inoperative, but pilot light is on.
Erratic operation.
Slide stalled and motor hums.
OM-1085 Page 18
4
5
6
1
2
Check and replace line fuse(s), if necessary, or reset circuit breaker.
Check fuse F1 and replace if necessary (see Section 4-2).
Speed set at minimum. Slightly increase speed setting (see Section 3-1).
Check and secure cord connections between oscillator control and slide (see Section 2-7).
Check slide area and remove any obstructions. Turn power off and back on to restart.
Excessive load on slide. Reduce load (see Section 2-2). Turn power off and back on to restart.
1
Potentiometer Gear
Loosen setscrews, and remove
gear from potentiometer shaft.
2
Mounting Plate Screws
Remove two screws securing po-
tentiometer mounting plate.
3
Shaft Nut
Remove shaft nut securing poten-
tiometer to mounting plate. Slide
potentiometer out, and allow to
hang free.
Install new potentiometer into
mounting plate, and secure using
nut from old potentiometer.
4
White Lead
5
Red Lead
3
6
Black Lead
Y Do not allow solder to fall
into unit. Cover exposed
areas when soldering and
unsoldering. Remove cover
and clean unit when done.
Unsolder leads from old potentiom-
eter, and discard potentiometer.
Solder leads to new potentiometer.
Reinstall gear onto potentiometer
shaft. Hub of gear should be flush
with end of shaft. Tighten set-
screws.
Manually move gun mounting plate
to the center of slide.
Turn gear on slide potentiometer to
one extreme, and then back five
turns.
Align gear on slide potentiometer
with small gear on drive screw.
.
Maintain a small amount of
backlash between gears.
Use screws removed previously to
secure potentiometer mounting
plate.
Remedy
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