I have been looking to remove my CD player and radio from a steepletone zero rock 50 and replace with a double din car audio system and have read that the lights are all on a different Circuit which will make the task possible ,
I think you could be right about a internal fuse blowing or even may be the transformer as I believe that is the main source of power that Regulates the audio side of your jukebox .
Tony
October 2017