ArgosySK is correct, and here is the schematic that confirms it. It is a simple circuit, so maybe it will help de-mystify schematics a bit for you in the future.
When all switches are closed in a path between the left and right “rails” of the schematic, all devices on that path activate. In this case, when the credit unit increments, its EOS (end of stroke) switch closes, activating your knocker coil.
So any increment to your credit unit (score threshold, coin up) will fire the knocker, including if you manually actuate your credit unit step up coil plunger by hand. Try it and see for yourself!
Saint Petersburg, FL
