I can't figure out why my drive rollor won't spin when I pull the trigger. I pulled off the motor and tested it and the motor works as it should. The red wire going from the motor to the coil is getting power but I'm not getting power from the black wire the goes from the motor to the circuit board. Does anyone know what the problem is? Im thinking it might be the circuit board but I don't see any signed of it being bad from looking at it.