Hello,
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,
JMPT

PB-LB (resized).jpg

First thing I tried !
Just means 1st player fifth ball doesn't get double bonus, second player does.

JMPT

LB relay = double bonus (on last ball)
After a lot of searching and sleepless mornings thinking about how to solve this, I thought about how schematics are drawn ie ball in shooter lane game turned off.
This could resemble let say, a single player game. I am using a 3 ball game.
I am assuming that the PLAYER UNIT is on 3rd ball at the 8 position (blue line) WH-GR line, you would energize LB because the PB switch is closed, thus giving double bonus.
But If you put a second player you energizing PB relay and open that switch, so there must be another path, or first player would never get double bonus (I think ???).
If that is the case;
My question : Does anyone know which path is used to energize LB, the green via P, motor 4A, motor 4C, or the orange via P2A,P1C, motor 2C, or something else ?
Or maybe I’ve got it completely wrong and it’s something else…
Thanks,
JMPT

lb (resized).jpg

Thank you!
My local supermarket no longer has car light bulbs, so I had a look with a volt meter set on continuity. Started with the P relay as it was easiest, that was ok. So I looked at the 4C, that was ok also, finally checked 4A, and there found it, it was about open about 5mm so it could never be closed. Bent it back in and all is working ! If I had looked at the motor switch position card, I might have been able to work it out. Hopefully next time…
I include sequence chart anyway.

Thanks again to everyone,
JMPT

PS any ideas where I can find info on how to fix a "total play meter" ?

sequence chart (resized).jpg