Quoted from 04barb:I got the flippers and pop bumpers to work . It was a bad pre driver transistor on the driver board for the flipper relay and I also found another pre driver transistor. Now when I turn it on it will fire all the solenoids until the fuse blows. I already replaced the 40 pin female connector. It has to be the large PIA IC5 chip? I think the chip was going because previously it would fire the ball kicker solenoid as soon as you powered up the game, but then the solenoid would shut off and you could start a game. What do you think?
Did you cut the blanking signal line on the driver board by accident? It is pretty easy to do, runs most of the length below the interconnect. If you did, all the solenoids pulse while the computer is starting because the blanking is floating.
I would use a andre's test rom on a bench test and monitor the solenoid outputs. In Andre's final test after pushing the diag button cycles through all the solenoids two at a time. You can work backwards to the PIA as well.
Vista, CA
