I have been working on an Electro-Arc tap burner in the machine shop. The power feed mechanism only works partially, as the feed-rate potentiometer seems to have no effect on the actual speed of the motor. We confirmed the potentiometer to be in working order so I believe there is a fault somewhere on this PCB. Not knowing any better, I would label this circuit as a "variable relay". Essentially using a low current potentiometer to control an much higher current power circuit. What would you check first on this board?
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