More than likely, it's the control unit. I don't have a recommendation for a repairman, but Vinylengine has the service manual. This should help a technician diagnose the problem.
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I've had a similar problem before. Strobe lines up but speed is way off. Pls download the service manual. I believe your strobe needs to be calibrated. You need a multimeter with a frequency range. There are test points inside the motor unit IIRC. Hope it helps.
Btw pls leave feedback for the seller.
Well, I found out that you have to hit the stop button after every speed that you use, then turn the power off...turn power back on then select a new speed. Doesn't seem to work every time this way, but after a couple of tries, will get you in the right speed range. I'll have to find the manual first. Thanks for the input/suggestions.
Yep, your right, I disassembled the control unit and found out that the 45 rpm micro switch was sticking, so all the contacts were cleaned and now it is working properly. I downloaded all the manuals from the Vinyl Engine site. Now on to finding suitable replacement rubber balloon feet as one of them is ruptured. Looks like Sorbothane doughnuts would work in place of the factory rubber units.