I’m trying to get a Gottlieb two-player Quick Draw with a rough history back to life. I have the schematics and the manual. This is my first multi-player Gottlieb project. Almost all functions work by now, but I have frequently a problem with the ball and player advance. The problem happens both in single player and in two Player modes. When the ball lands in the out hole, any bonus correctly counts down, the ball then gets ejected into the shooter lane, on its way it triggers the trough switch. This sequence works.
If no bonus has been scored the machine advances reliably to the next ball / player. (Triggers the P relay which initiates both drop target reset and ball / player advance)
But if a bonus has been scored, the ball advances to the shooter lane very often without triggering a drop target resets AND a ball or player advance. Always both either work or don’t work.
I observed with an LED connected to the P relay coil, that in a “normal” case, the LED shows a solid maybe ½ second light, whereas in the failure case (no target reset and no ball/player advance) it shows just a very short flash or nothing. Probably not enough power to activate self-hold of P and initiate the reset / advance.
I have cleaned Motor switch 1C without improvement.
I suspect it could be a timing issue. Is it possible that the motor is still turning (with M1C open) when the trough switch is activated?
Anyone had that problem before or can think of the reason and cure for this?

P schematics (resized).jpg

Subtract_Bonus1 (resized).jpg

Thanks Paula and Dave for your feedback.
I confirmed that 2B has good contact and is closed for most of the cycle. Also checked the out-hole switch and it has a generous gap.
Looked some more at motor timing and it seems that 1C and 4C engagement are not separated enough, so there is some overlap. In the image both cams (#1 and #4) are in the motor cutouts. Could that have to do with it?

Cams (resized).jpg

Hi Paul,
I agree. But in order for P to lock on it needs to be fully pulled in in the first place through the trough switch AND 1C. And that doesn't seem to happen after a bonus countdown. My suspicion is that the motor is somehow still moving when the trough switch gets triggered and so cannot connect through 1C. Will have to think about how to verify that theory.
Frenchmarky,
I also checked the bonus zero switch and can't find anything wrong with it. Right now I can only manually check by actuating the step up and step down mechs and it seems fine and snappy. This is really odd.
The cam followers for 1C and 4C were in the right place (both S), but I have found that switches on M1C and M4C were overlapping (the manual shows a clear gap in between) and I adjusted the switches so that this doesn't happen anymore. Will test tomorrow if that has helped.

Thanks paulace and @frenchmarky.
One step forward two step back. Before I could try all your suggestions, my beauty wouldn't start up again and ended in the usual endless motor-tango with the Bonus reset coil clapping with the beat. I found M1A had lost all conductivity and so I bit the bullet, took the bottom board out and will clean up all motor contacts. I didn't do that initially because the pin was " almost" working when I got it. But it had been neglected for so long that I'm now scraping little mounds of dirt from the cam followers. Someone must have put grease on it at some point in time. Will report back when all is back together... Thanks for now

dirt (resized).jpg

All good. Going through all the motor contacts, cleaning and adjusting the gaps did the trick. I also made sure that motor pulses from stack #4 and #1 are no longer overlapping. Works flawless now. Thank you everybody!