Minuteman E20S - Testing the Drive System Potentiometer

19.4 Testing the Drive System Potentiometer
5 K
5K Fixed Value
Does not
change while
turning shaft
Fig. 1
5 K
5K to 0K
Variable
Resistance
Adjust shaft
while testing
Fig. 2
5 K
0 to 5K Variable
Resistance
Adjust shaft
while testing
Fig. 3
1. Disconnect the potentiometer from circuit
2. Use ohm meter (preferably an analog type) to measure the resistance across the
two outside terminals (Fig. 1). It should measure 5K (5,000 ohms +/- 20%)
3. Measure the resistance from the center terminal to each outside terminal.
Fig. 2 and Fig. 3) The resistance should show a smooth change while turning the
shaft on each.
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