Quoted from Mad_Dog_Coin_Op:It isn’t in the schematic. I was thinking it could have been a service bulletin after the fact. I have a new mpu coming in the mail. I can try it with and without the mod. I was just hoping somebody could explain the reasoning behind it.
I don't remember seeing an extra resistor installed on my game.
I also don't remember seeing a service bulletin about it, but if there is one, it should be at the back of a parts catalog.