stern dracula

cobow

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have one im restoring at the moment, every time the ball lands in the playfield kick-out hole or the out hole the game adds and subtracts 1000 to the score constantly with no kickout untill turned off. the coils test o.k
any ideas
thanks in advance
cobow
 
That a strange problem assuming the coils work fine in test and the ball is kicked out to start a new game but never gets kicked out again after the first drain.

Could be a ROM or RAM problem. My first thought would be RAM. Could be caused by battery corrosion. Try reseating U1-U8 and look for any battery corrosion. I would replace the ROM and RAM sockets if they're original and install freshly burned EPROMs as a start. Testing the RAM with a test ROM or trying known good RAM is also a good idea. I don't usually advocate a shotgun approach but with old Stern MPUs you have to start with good sockets and game code.
 
i was thinking something like that, battery corrosion is good, il reseat & check the sockets. thanks for the reply
cobow
 
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