Working on a basket case WCS.
I've gotten everything working so far except for the flippers.
In switch test, the entire column of the switch matrix is dead. Both flipper switches and both EOS switches. (can't test the other pairs since WCS only has 2 flippers).
The optos are working as I am able to see a change in logic all the way back through the fliptronics board up to the ribbon cable that leads to the MPU when I push either flipper button.
I have voltage at the coil.
The MPU board is brand new.
The security chip and ASIC are also brand new.
No issues with audio or display, so I don't think its a ribbon cable issue.
So from what I can tell, the flipper switches are being detected by the fliptronics board, but the MPU is failing to see it and report it.
Ideas?