Hey, I just saw this post, did you make it work? If not, you can try, with the board turned off, turning it on with the dip switch 1 ON (service mode), this should trigger a test that can give you a message with the possible faulty IC. Also you can try cleaning it and reseating the top and bottom game boards, maybe something somewhere is making bad contact. Here is a Pacmania service manual that's can be useful for fixing that board: https://www.gamesdatabase.org/Media/SYSTEM/Arcade//Manual/formated/Pac-Mania_-_1987_-_Namco.pdf