The processed energy leaves the board to drive the machine's motor.
This is the speed control dial. On these boards, the potentiometer often includes a built-in safety switch that must "click" off to reset the circuit before you can change the spindle direction. jymc220bi schematic full
Controls how hard the board fights back when a load is applied. If the lathe bogs down easily under a light cut, turn this trimpot slightly clockwise to increase low-end torque responsiveness. The processed energy leaves the board to drive
Disconnect power. Set your DMM to continuity/diode test mode. Measure across the drain and source pins of the power transistors. A reading of Controls how hard the board fights back when
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The logic circuit blinks an internal LED inside the optocoupler.