Hi I have a high speed with a system 11a board in it, my special solenoids are not working, I bought this board off of eBay...my question is, will this board be a direct drop in or do I need to do some sort of modification before it will work. Everything works on this board but the special solenoids so before I start trouble shooting the board I'm just curious if any one knows of anything special I need to do to get this game to work, also if anyone knows which ic's are most likely the culprit that would be useful I don't care about replacing any amount of chips

Ok I have the original board that was in it and all the special solenoids worked so I'll swap it and post the results

Nope

Sorry...I swapped out u50 and no go I'll be swapping out all other chips that are in this circuit and be posting results

I thought the diodes were only when putting a system 11 board into a system 11a or 11b game, not when putting 11a into 11...let me know

Fixed....special solenoids switches needed board work....fixed that....then I couldn't get my main relay to come on, replaced a bad u50, then also had a bad u56 replaced these and game is up and operational....now I have a few mechanical things to take care of on the playfield and this game will be working 100% as it should

I used what I believe is a system 11b... I thought it was a system 11a but it was not....basically 2 of the pins were going to ground and I severed those traces....to match the system 11 board