lamp prob. on williams '77 strikes and spares

HAVASUGAMEMAN

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lake havasu city, Arizona
i have issue with the feature lamps on this machine. I get 5 volts at the test points on the lamp board, under playfeild at each one of the blub sockets also have voltage, but along with it there is the same votage on the grounded side of the socket also. i am now thinking that there is a bad socket that is shorted? but if that was the case wouldn't it blow a fuse?removed all the blubs made no change. could it be a bad ground making all feature lamps not work? thanks any help would be great..
 
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