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Saturday 21 April 2018 at 21:18
Just another suggestion. I had an I500 do the same thing once, and like yours it was only when the pf was down, not up. What I eventually found was a lamp socket screw had fallen out, and when the pf was down, the socket was just touching a switch causing a row short.
Like others have mentioned, go...
Source: http://pinside.com/pinball/forum/topic/magnet-loop-breaks-game-totan-suggestions-1#post-4353191