Quoted from ForceFlow:
Maybe something with the board's reset circuit, then? What does the reset button bypass on the schematics?
Gosh, I wish I had schematics.
Something has changed; it only started doing this recently. So it could easily be deteriorating capacitors or oxidizing connectors causing this side-effect.
I'm guessing the reset button simply grounds the reset line on the sound board's CPU. I haven't traced it out, but that's usually how they work. The MPU board is probably supposed to somehow pull the same reset line low on startup, but isn't for some reason.
Assuming all that's true, I guess that leaves one of these:
- Floating ground between the two boards (aren't Gottliebs famous for this?)
- Issues with the connectors between boards
- Voltages too high or low for the reset assert to work (possibly bad caps)
- Logic failure on the MPU board
I don't have schematics so it's hard to get into specifics. I can probably eliminate the first 3 possibilities without schematics. Anyone know where I can find some?