I'm working on a Orbit and having some trouble with the ball return.

When the ball lands in the outhole, the O relay pulls in, the ball is kicked out and then, as it passes over the trough switch, the O relay is pulled in again and the ball return kicks a second time.

I can't believe that this is correct, but I'm at a loss where to look at this point. Checked all the switches in the O relay and motor 2b, 1c and 4c. I'd be willing to quadruple check if you have a strong opinion on the matter. I've also blocked off the NO "P" switch at about 3E on the schematic. That fixed the double tap, but then the player unit would not advance.

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Yes. That was how we first noted the behavior

OK, it looks like it is still an open issue. We are about to the point of declaring it a "feature".

I had this on a Magnotron recently as well and finally punted.

There is no service jack on this one, so I would need to desolder the motor. This will likely have to wait until the next time that I see the game, which will be Monday.

Looking at the schematic, per the markup below, I am quite sure that the O will fire. The trough switch pulls in the P. The P closes the NO switch and then the O will fire.

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We tested it without a ball.