Super Punch-Out: left sound channel stopped working

MaximRecoil

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Super Punch-Out: left sound channel stopped working

This is getting ridiculous. The boardset is in good shape physically; no corrosion or anything like that.

The left sound channel, the one which has the music and sound effects for the punches (not the one which has the announcer's voice) stopped working while playing a game. First it only partially stopped working, e.g., I'd throw 4 punches and only hear 3 punch sound effects. But after about 30 seconds, it stopped working altogether, aside from occasionally generating random notes, some of which formed simple tunes I've never heard from that game before.

I guess the first thing to try is replacing the 2A03 CPU, which is the CPU for that sound channel, though I doubt that's the problem. I suspect it is one of those TTL chips; I've half a mind to just replace every TTL chip on the CPU board. Then maybe it can go a year or two without one of them giving up the ghost.
 
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I guess the first thing to try is replacing the 2A03 CPU, which is the CPU for that sound channel, though I doubt that's the problem.

I don't believe it; it was the 2A03 CPU. I could have sworn I bought an extra one of those back in 2005 when I first got this board, because it was having audio issues and that was the most obvious thing to try. But I can't find it anywhere, so I had to borrow one from a Punch-Out boardset.

ETA: I knew I had a spare 2A03 CPU at one point:

MaximRecoil
Re: Missing sounds in Super Punch-Out *added sound samples*
« Reply #13 on: October 31, 2005, 03:14:37 pm »

Well, that didn't work. I replaced both the CHP1-C.4K EPROM and the 2A03 audio chip and no changes whatsoever, so I put the old ones back in. There were a couple of thin green bridging wires on the solder side of that board, one of which connected to a leg on the 2A03's socket, and one of the points barely had any solder on it at all, and a couple of the other points looked shady at best. They were originally soldered by hand from the factory because you can't attach wires on the bottom side of the board like that in the Wave. I reflowed all of those points but again, no changes.

It sucks that I can't find it now.

ETA 2: I found it:

p4L6meU.jpg


It's a good thing I did; that's a $25 chip:

https://www.mikesarcade.com/cgi-bin/store.pl?sku=RP2A03

I think I only paid something like $6 or $8 for it in 2005.
 
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