Calling the late 80's SEGA/After Burner experts:
My right speaker next to the After Burner logo on my upright has been dead since I acquired in '23.
I've only JUST now started to look into it because of life and everything else I was doing with other machines. The sound was stellar out the left speaker so I just went with it for that time.
Before anything, I elected to install a new 4" 8 ohms speaker to start from scratch. Re-crimped new female wire connections to accommodate a larger male terminal on the new speaker. Turn the game on, getting 6.12v DC out of each terminal, both the working speaker and the non-working side. (Right/left) Still no sound.
I pull the admittedly dirty sound amp from the game and brush it off, dust it well, reflow solder to the connection points for all three connectors. I put it back in the game, forgo voltages just to see, still no sound out the one speaker.
If I'm getting 6v DC to the speaker terminals, is it worth it to even keep looking at the sound amp? I was getting 12v when I went back at the red/white wire on the connection on the amp.
Is it part 400-5070 I should look at next according to the manual, the DC power supply to the sound amp? Or is it something else because of the voltages at the speaker terminals and the fact sound works flawlessly out one speaker? ICs 11, 12, 13, 17 resat on the board?
What say you