I too have been working on restoring a Gott Hot Shot. The machine was a basket case that I rescued from the basement of a house that was being rehabbed for flipping. It was completely dead, with several missing parts assemblies, and someone had painted the cabinet over with a brush using blue & red house paint.
I had never owned a Gottlieb 4-player EM before and put in a lot of sweat equity and had some good help from another Pinsider. Now have the game booting and mostly working properly.
I note that when booting the machine for a 1-player game, one of the latter steps in the sequence is for the 4 large drop-target bank reset solenoids to fire and raise all the targets. No problem there. If I then press the credit button again to enter additional players, the machine fires all the drop target reset solenoids one time for each additional player added.
Is that the way this era of machine was supposed to work, or do I still have a bug to search for?
My understanding of the schematic is that these solenoids will fire every time the S relay energizes (by pressing the credit button?). Seems like a lot of unecessary pounding on the target bank reset parts occurs with this step? Is my machine operating correctly?