Quoted from dr_nybble:My left flipper is fluttering on occasion when held up. I've cleaned the optos and reseated some connectors on the Fliptronics board.
In switch test I do see the EOS switch state changing when the flipper button is held in.
What should my first diagnostic step be -- swap flipper opto boards and see if the problem follows the board?
Go into switch test and hold the flipper up with your hand. Does the eos still change states? This is the cause of the flutter. You probably just need to adjust your eos leaf to be more sensitive