For sanity, anytime someone asks me to check Jc pin x, this always bare/without any connection to it?
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Had a few spare hours so I just tore the boards out and reflowed everything and double checked all the continuity and connections. Replaced some fuse holders that had been soldered (?). Checked all the transistors, fine. Booted it up, Eject and Ball launch fired for the first time and it tried to work, however, a ball already lodged in the VUK stayed there the whole game and was never released.
Tried it a second time, went back to the original problem of dry firing the auto fire.
Don't know if this sheds any light on the potential problem? All that changed between the working launch and the non working launch was me lifting and lowering the playfield. Guess I'm looking for loose wires under the playfield tomorrow.
I would look at the trough switches and all VUK optos. If they're loose or not aligned then lifting the playfield will affect them.
https://www.pinwiki.com/wiki/index.php?title=Data_East/Sega#Ball_Trough_Issues