Please keep it simple to match my understanding of these, I'm mainly an EM guy.
After playing fine, mid session, wouldn't kick out a ball at start of game. On test, only flippers, gate, and coin solenoids fired. Good voltage on playfield at non-firing solenoids, grounding transistors activated them. Good readings on test points on SDB.
I recalled reading somewhere that the sound board could interfere with solenoids, so unplugged that, no change, but after plugging it back up, the solenoids are working. Does this mean just a bad connection? Any further diagnostics I should do? Should mention that the sound board doesn't play the correct tunes, but somewhat random in a minor key. The sound has changed from when I first got the game.
Thanks for any suggestions.