This is a super old thread, but I didn't see the need to start another one.
When we last left our hero, 10B was fried. Since then, 10B has been replaced and my 3X is now working! Unfortunately, some other gremlins seem to be coming up. The game still starts and resets without any difficulties. However, the ball never kicks over into the shooter lane. I did some searching on the internet and found this section from xmission;
"8. Place the ball in the out hole. The ball return switch closes and completes the circuit to 'O' relay through the normally closed switches on zero position 'Bonus' unit, motor 1C, motor 2B, 'Q', and 'AX' relays. 'O' relay locks-in. Through switches on motor 4C, motor 1A, 'BX' and 'O' the ball return coil actuates kicking the ball onto the runway."
This is where I am having issues. If I manually activate 'O' the ball return coil does not actuate and does not kick the ball onto the runway. I am looking at 'O' on the schematics but this is a very complicated area. It crosses over to P coil, I, G, K, V, etc.
How do I narrow the section down?