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You need to take note of the model you are using, and then look in the manuals for instructions on that model. I would start with the -12 manual, and begin at the first page and read it till the end. There are a number of differences between the three models. Do you have the manuals. all of them?

The knob is not suposed to adjust anything. Its for the precise power Model, (MEP-105A) and 400 hertz model, (MEP-115A. The black knob under the control panel, right side, is for adjusting the hertz/RPM. Turn it clockwise, increase the hertz. Push the button in the middle, it releases the...