Got a column of switches not working, pin 6 on J207. Have confirmed issue is on the board.
Changed U20 and U14, no change
Logic probe all the areas as detailed on pinball wiki.
When logic probe I get a high reading on all the pins including pin 6. However pin 6 gives a solid tone, the other give the same tone, but the tone is pulsing. Is the difference an issue, I get the same tone difference at U20