I have a bally 6000 with a small board attached to the coin Mech and the service button. Normally when you hit the service button credits show up in the far left credit window, so you can play the game. The game had a 88 code on it so I replaced the battery then Ram cleared it with the coin mech switch in the up position. set up the date and time then tried to set up the options as best as possible. I currently have no errors but the service button will not add credits any more. is there an option that has to be set in a certain way to make this little board with a 8 pin chip on it work again?