penn station posted:Since the control relays interrupt the power to the track, the bricks are still powered. If you have a pilot light on the output of each brick you will see which ones that are on.
Depends on the brick, the Lionel PowerHouse 180 light doesn't go off when the breaker trips, for instance. In any case, simply having the control logic remember the trip condition solves that problem. 
penn station posted:*Relay logic - I have an EM (electro-mechanical) Space Odyssey pinball machine from 1976. EM pinball machines are all relays, switches and solenoids. These machines have a score motor, essentially a washing machine timer switch on steroids, that turns until certain conditions are met. The score motor is what makes the score roll up multiple steps on one switch closure. Mine has a common problem where the score motor does not stop running. Debugging this is no easy task. The schematic is a ladder diagram (one way of showing relay logic) - it is 4 feet wide.
FWIW, I used to own a bunch of pinball machines and in high school I worked at a pinball and jukebox supplier fixing the machines. I had to fix all the pinball machines I had later in life, that's how you get them cheap! I had some of the relay models and a few of the electronic models. There are tons of Internet sites dedicated to pinball repair, and you can get a bunch of expert help if you look around. The fact that you have a a schematic of the logic is a huge plus, that should make it tons easier to track down your issue.
