Recently finished my shop job on this game.
The guy that had this machine before me put in a button/switch to add credits. (he cut a few wires leading to the coin mechs).
whether I push the start button or the hacked in button I get 4 credits and the game starts.
I've checked the obvious coin credit options by the jones plug on the score motor board and
it doesn't' matter what I have the 25 cent coin options set for( 2 to 5) - I always get 4 credits.

I do have the schematic, but the coin/credit part of it is pretty detailed for me.

any ideas would be appreciated.
thanks
M