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Museum of the Game® & International Arcade Museum® Forums
I fired up my Tail Gunner II the other day - no BOOM.
It came with the 22K resistor mod, so it was still too loud with that. I'm shifting to the 2.2 k resistor next.
I did ring out the speaker wires and the speaker (new speaker, but with the BOOM, you never know) and they work.
Going into the Audio section, there are two transistors - Q6 and Q7 which look like they could be the culprits.
Symptoms: Audio is kaput. No:
Rumble
Fire Sound
Shield Sound
Nothing.
That's why I went after the audio transistors first.