MaximRecoil
Well-known member
[Solved] Super Punch-Out: missing music channel audio
This is TapperAdict's boardset. He sent it to me to check which ROM set version he has (it is the standard version), and while I have it, I'd like to get the audio working. Here is his explanation of what happened to it:
The video and the speech channel audio are fine, but there's nothing but dead silence on the music channel (left speaker). Here's a picture of where all the visible damage happened:
The green wire is to replace a trace that was completely burned through. I also replaced those two C1815 transistors (Q1 and Q2) with new ones. The R69 1 Kohm resistor and the R68 180 ohm resistor were burned and replaced as well. I can't see any other traces that are bad. The rest of them visibly look good and I've checked continuity on the ones that seem relevant, back to the card edge pins.
Also, I've tested both the 2A03 CPU and the EPROM at 4K and they are both fine. I don't understand electronics circuitry in-depth like some of you guys do, so I'm out of ideas. For reference, here are the schematics for the CPU board:
https://i.imgur.com/Ku9z3BH.png
This is TapperAdict's boardset. He sent it to me to check which ROM set version he has (it is the standard version), and while I have it, I'd like to get the audio working. Here is his explanation of what happened to it:
Yeah, So what happened was I took the bottom monitor in for a cap kit and a rejuvenate. That monitor has an audio board inside the chassis. There are two gray cords that actually have the same connector type. Those got switched at the monitor level. So the power went through the Audio board in the monitor (instead of powering the monitor) and then out through the audio cord and fried the audio section of the board.
The video and the speech channel audio are fine, but there's nothing but dead silence on the music channel (left speaker). Here's a picture of where all the visible damage happened:
The green wire is to replace a trace that was completely burned through. I also replaced those two C1815 transistors (Q1 and Q2) with new ones. The R69 1 Kohm resistor and the R68 180 ohm resistor were burned and replaced as well. I can't see any other traces that are bad. The rest of them visibly look good and I've checked continuity on the ones that seem relevant, back to the card edge pins.
Also, I've tested both the 2A03 CPU and the EPROM at 4K and they are both fine. I don't understand electronics circuitry in-depth like some of you guys do, so I'm out of ideas. For reference, here are the schematics for the CPU board:
https://i.imgur.com/Ku9z3BH.png
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