1969 Williams Expo score resets after ball drain

Feb 22, 2019
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Hello I am a newbe, I have a 1969 Williams Expo EM pinball machine. Game resets and starts, ball in play score and plays fine once ball drains the score resets and game continues to next ball once that ball drains score resets again and game goes on. Any thoughts as to want I need to check?
 

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