I have a 1989 Syncrowave and the current adjustment knob is "compressed" so that 0 amps starts at a about 70 A dial setting. It uses the older type PC1 board. The high end is OK so that I get 300 A at the max setting. Adjusting the pots that set max and min current will not trim this out.

It looks like the op-amp that measures the shunt had some components replaced around it with a tacked on capacitor and spade lug to ground. Someone added a third wire to the shunt also. Does anyone know if this could have been a factory mod that isn't documented? --Not sure why anyone would do this. The foot pedal in remote works fine also (0 current to max current fully depressed, no matter the dial setting).

Any help would be appreciated. Thanks.