No Fear trouble

Atari123

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Atlanta, Georgia
I've got a No Fear machine that's been giving me a little trouble lately. Occasionally the right popper will continue to go even after a ball's been put into play, or an event like multi-ball will be delayed, or it won't register that the ball had drained and will instead pop another one into play. I've tried a factory reset, and all the switches seem fine. Does anyone know what I should look at next? The game is running 1.0 of the game rom, if that is a factor.
 
put it into test mode and go to the switch test and test the ball trough switches is where'd i'd start

a small piece of paper can be used to interupt the beam to see if it registers on the display
 
If I were to guess, It is one or a combination of: opto or opto board lm339 chip. or maybe as simple as a wire not connecting well on one of those locations.
 
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