Hi, I have a Dirty Harry pinball machine and I havent used it in a while so I changed all the 555 bulbs that were out and made sure everything worked. It does! Problem is everytime I shut it off it reverts back to "Factory Settings Restored" and Bookkeeping totals cleared....My question is, is there a battery backup? It never did this before so I have to assume there was a battery and now it has died and I would really love to replace it. BTW I also have non pinball games i.e pac man upright, ms pac man (added board) and Asteroids upright...so I guess I would like to join your forum but its ok if you say no too...If you could just please answer my question I would be very appreciative. Thank you.
Jim Caputo

Thank you very much, I forgot about the back panel, had to shuffle around for the key....found it and it works like a charm. Love multiball...
Jim