I have an overlocker for stitching carpets and once I turn it on and leave it on the slowest setting, the speed will slowly increase by itself. When this happens, the voltage between the speed increase potentiometer, increases by 0.001V. I've stripped the thing down and the circuit board looks fine. Could this be a faulty potentiometer? Or something else? There is some soot inside the housing near the transformer and drive belts
Pictures here: https://imgur.com/a/sUjRJrU
Pictures here: https://imgur.com/a/sUjRJrU
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