Playing a Bally Bingo Pinball Machine

These machings are gambling devices. At the beginning multiples nickles are inserted to try to bring up the payout and features. When the game ends, more coins can be inserted in an attempt to win more balls to shoot. The 19 is stuck; I need to find the trouble and repair it. These are very complex machines, essentially electro-mechanical computers. The rotating units are essentially the computer's clock and as they go around, the various scoring can interrupt the sequence, do their thing, then let the enext unit ave the opportunity to interrupt and do it's thing.