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Tuesday 20 March 2018 at 17:28
On some games the magnet does tend to make a loud buzzing or humming noise while being tested.The coil/magnet will pull more power in testing but during gameplay it will not pull that much power because other coils,magnets,flashers. ect will be supplied power evenly from the driver board.
Source: http://pinside.com/pinball/forum/topic/spider-man-magnet-problem#post-4290631