Sega Harley Davidson - no sound....why?

Vectorman

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I've got a Harley davidson that has no sound at all. I've tried swapping the sound amp board with two others (unknown) and still no sound. I suppose all three could be bad, but I doubt it.

Has anyone else seen this problem? Any clues?

I put a scope on the input wires to the sound amp board and it looked like there was some wave action happening there....so I think the game boards are putting out something.

John
 
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