Hi everyone. I'm quite new at this so bear with me. I decided to do a flipper rebuild on Funhouse, new coils and all. Things went south because I didn't take into account that the diodes on the new coils faced differently than the ones on the old coils. I fixed, went over the circuit schematics and managed to get the flippers working but instead the ball trough dispenser won't work when balls hit the microchip sensor and instead of kicking out 1 ball it usually kicks out 2 (I've only got 3 balls in the machine). I've checked and re-checked the wiring up and down the whole play field to make sure that there wasn't a disconnect along the way, the micro switch measures fine (maybe I need to disconnect it completely before measuring?) and I went over the fuses and made sure they were all right and not blown but to no avail. Any ideas?

Thanks for the info! I checked each switch in the trough and yup you were right, both the out hole switch and left trough switch don't work. I checked the wire connections and they're all connected, opened each switch up to see if the connector points needed cleaning, it wasn't that and I even tried putting in new switches but none of it worked. im at a loss.. I read somewhere when the U20 chip blows it causes trouble in the switch matrix but I doubt it's that since it's only these two switches. Maybe you guys know how I can check if the chip is fine just in case? And if you have any other ideas on how to fix this problem I'd greatly appreciate any suggestions! Thanks in advance!

Thank you guys for excellent advice. I found the problem and indeed it was the green wire with the purple marking. A cow worker had accidentally disconnected it from the right jet bumper and soldered it on to the wrong eod switch connector. Took me some time to figure it out but after comparing the other jet bumper eod switches it became quite obvious. I never would have spotted it if you guys hadn't told me to take another look.

So that's fixed and now I'm dealing with the start button, right trough switch and right slingshot kicker switch telling me that row 3 is shorted, now i'm looking at the orange and white wire and not finding anything yet again. Everything seems fine, probably a problem i'm just overlooking like the last one. Again, any suggestions would be greatly appreciated.

Thanks again everyone for the advice already given, it was incredibly helpful!

Thanks LTG! As soon as I removed plug J206 the start button switch opened up so it must be out in the game. Kind of makes me relieved since it's not the board or any of the chips acting. On goes the search!