Demo Derby upright has no sound

Bullwinkle

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Sep 10, 2009
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Rochester, New Hampshire
I have a demolition derby 2 player upright. Works fine except there is no sound. We thought we had it figured out (the door tilt contact was touching so we pulled it apart and the sound started working).. I then went to move the machine back into the gameroom from my repair area and the sound stopped again. Again i went to look at the door tilt to pull the contacts apart but this time it didn't help. So I know the speaker works from the previous sound we got before moving. I've checked all connections and at this point am at a loss. It's almost seeming like the previous fix was a coincidence.

any suggestions?
 
Does your upright have the 3 board sandwich. If so is your player cars red and blue. Sorry not much help on the sound but mine doesn't have any red cars just wanting to find someone with the same board type that has red.
Thanks
 
Tony, I do have the 3 board sandwich... and yes, cpu cars are grey, p1 car is red and p2 car is blue (or other way around)..but yes I do have both red and blue.
 
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