Quoted from Dashmonster:How do I know if my magnet fails? Is there a diagnostic at game start up that shows this? Or are we just noticing it not working anymore
For me I just noticed it hadn't been grabbed in a long time. Then go to tests, coils, loop magnet. Make sure the coin door is closed. and have a ball near the magnet while pressing start.
The test pulse is very short, not a long grab like you get in the game - but if the magnet jumps at all when you hit start, it works.