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Originally Posted by David55
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Dave,
You turn the switch to the lower left corner marked 2000, place a meter lead on each of the outer terminals on the pot and the meter should read 500 +/- 50 if things are OK. Then take one of the terminals and place it on the center terminal (leave the other on an outer terminal) and you should see the meter vary as you turn the shaft on the pot from zero to about 500. The meter should not show an open circuit during any point on the rotation. This indicates a failure of the pot internally. Is there any other markings on the pot? In your design, what does the pot feed?