Quoted from barakandl:If you install JP1 and R8, both zero ohm, I think that will disable the coin door interlock circuit. DO THIS AT YOUR OWN RISK, JUST MY GUESS FROM GLANCING AT SCHEMATIC.
That is correct.
I did this with a Game of Thrones that had no doorswitch and customer had received different model , so with the jumper J1 installed, this circuit (U3 U4) is overruled and 'VBBGOOD'-signal (generated at U2) is send to compter again