Johnson motor controller pin out schematic needed

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Joined May 26, 2022
I have a Johnson JC22-001. SJED08092HF motor controller from a Horizon treadmill that I am converting to operate a dc motor on a variable speed machine. Does anyone know where I can find the pin out for the control board? I need to find the wires that control the speed so I can hook up a potentiometer. Thanks for your help.