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There is a great video on YouTube that shows how to repair this. https://www.youtube.com/watch?v=eCZNc7tPop0 Basically, there are some surface mount capacitors on the PCB board for the screen/buttons that need a little bit of soldering to make sure they are properly electrically connected. I have performed this repair myself with success.
A speed in second makes no sense to me. Are there more information about this motor, like to maximum rpm/power ? If so, maybe that the scale from -100 to 100 is some sort of percentage of max rpm/power, with the positives being one rotation direction and the negatives the other ?
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