I am trying to diagnose a problem. I powered up a No Fear and a couple coils locked up. I blew 104 and 105 fuses, which I replaced. Machine boots but now none of the dedicated switches work and I am trying to find the problem. Trying to understand the schematics and it seems like I can jump a 5v line to each of these pins on the mpu board to see if they work? If so I can pinpoint the problem to board or not. Any help appreciated, thanks.

No. It was already set up with remote battery and was working fine prior to the issue.

I will have to check that. It didn't look that way, but I could easily have missed something. Seems to show from coin door board to cpu board.

Ok, thanks. It has an explanation under the diagram, but I must have it backwards. Wanted to check before I did further damage testing it. Thank you!!

So just now getting back to this. When I jump the pins to ground on the mpu, the swiches registers. Since it is all of them not working I assume it must be the ground circuit that serves the coin door. I think my best bet now is to test continuity out from the mpu to the coin door and find the break. I will post as resolved if I find the issue.

Found a ground wire on the coin door disconnected. Everything seems to be in order. Thanks to everyone who added pointers. Merry Christmas!