It sounds like your transformer is wired properly, otherwise you'd get that nice bubbling sound.

The fuses are also working, otherwise lamps or motors wouldn't run.

So you're left with switch adjustments. The ball lift motor cams have a run-out switch. If you examine the cams you'll find a dwell where the switches are supposed to change state. Check that, assuming your lane switch is properly changing state when a ball sits on it.

I honestly had no idea that you had the schem up on your site... that helps a ton!

Well, it did sound like that was the problem being described, but I'm often wrong.

The schem also shows the first trough switch (might be located in the area underneath the lifter) - if constructed like the bingos, there's a switch that is actuated by a little pin. Often this pin is rusty or gets stuck in machines when I first get them due to old crud. Make sure that it changes state as a ball is being lifted, and again when a ball settles on top of it.

But follow all of @baldtwit's advice first.

+1

Did you check your trough switches?
Check those and the shutter motor as MrBally said.