EM Nugget Shuffle Alley Help

kooties8

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Donor 2017
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Hello everyone, new to this community so I hope I am asking in the correct area. I own a 1977 Nugget Shuffle Alley EM machine which had several issues when I purchased it 4 months ago. I had it working correctly for the most part, but after doing some cleaning of the roll over switches, cleaning of the score motor disc, player up unit disc, extra shot unit disc and some other areas the scoring doesn't work correctly. If I start a game and take a shot in regular game mode the pins seem to go up correctly but randomly the score gives me a strike even if there was 3 pins remaining. The scoring seems to work correctly if I do not hit the head pin. Again this is random, sometimes if I hit 7 pins down, it is scored correctly but other times it gives me a strike or spare even if some of the pins are still down. Before I start working on the roll over pins (I'm assuming the roll over head pin is messed up), I want to see if anyone has any suggestions that I might be missing. Note, I have tried player regular games with just 1 player as well as 3 players and the results are the same so I have eliminated the strike-spare units. Thank you for any advise in advance.
 
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