I bought this 1976 Chicago Coin Jukebox (the 4-player version of Sound Stage) about half a year ago when it was broken. I got it working, then decided to tear down the playfield, paint it and clearcoat it. After doing so I reassembled the playfield and started to test game functionality.
Everything worked except when I hit the "F" target, it shorted the GE lighting and started to burn something so I turned it off. I checked the schematic and read it only goes through "F" playfield relay board.
So I replaced the relay, turned on the game and it did the same thing. Instead of turning it off I wiggled the relay box and it no longer shorts the game, and the relay does function now, but the light does not light.
I know it not a light bulb or socket issue because I disconnected the wires to the "F" light socket and the "D" light socket and purposefully shorted each to so see if I could narrow down the problem. The "D" will short but the "F" socket will not short. So even with the "F" relay locked the wire giving power to the socket will not short when I ground it. I have replaced the relay, what else can it be?