The problem is on a 2 player game, the first player doesn’t get double bonus on the last ball, but the second player does.
The LB relay does not kick in for the first player. It works fine with a single player.
I don’t understand the schematics, as shown, the PB switch is naturally closed (circled in blue I'm assuming that it is the problem since the machine works fine with only one player, and PB is the only thing that has changed) , which to me is the good position in order to energize LB, yet if PB is energized i.e. 2 players , that switch would be open?
I am assuming the player unit is in position “8” at that time, maybe it’s not?
Hope I have been clear enough and let me know if you need anything else.
I look forward to your “analysis” in order to learn more about the functioning of these machines.
Till next time, many thanks,