I am having a horrible time figuring out my special solenoids on this game. I got the game in an unknown state. Did the usually repairs (replace sockets, header pins, interconnect, etc). Thought it was working on the bench and moved it to the game and 3 solenoids lock on at startup. I have changed most chips in the circuit including all PIAs. Transistors are testing good. My signal from the PIAs are inconsistent and wondering if the problem is on the CPU board. I just replaced IC4 (8T97) and get the same problem
Any thoughts? I’m all ears!