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Asteroids coin-op audio hum


sideburn

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Hi. I am restoring my cocktail asteroids. It's was working fine when I put it in storage in my parents garage 30 years ago.. but it's developed a weird fault. Everything is fine, not even much of a hum, but the really strange thing is that the saucers don't make their warning noises when they are on screen. (Low pitched for big, high pitched for small) they still make the shooting noises... Is there a particular thing/chip/part of the board I should look at to fix this one sound issue? 

 

Thanks in advance

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