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  1. #10
    Quote Originally Posted by JAZZCNC View Post
    I think it is the speed control board, does it have a potentiometer on it.? I think the AP stands for Analog Potentiometer Board.
    The blue thing, top right hand corner of the photo is a trimmer potentiometer, possibly a multi-turn type. The label under it looks like "START/STOP". If you adjust it keep track of how many turns and in which direction so you can put it back where it was.

    Edit: Just made time to read Doddy's link. START/STOP is a label on one of the connectors. The potentiometer is for the speed at max control voltage. Pots can become faulty and go high resistance but it's possible to clean the track inside by simply adjusting it up and down a few times. Certainly worth a try for the time it takes.
    Last edited by Kitwn; 07-04-2020 at 09:59 AM.
    An optimist says the glass is half full, a pessimist says the glass is half empty, an engineer says you're using the wrong sized glass.

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