CPS1 no audio repair

    This site uses cookies. By continuing to browse this site, you are agreeing to our Cookie Policy.

    • CPS1 no audio repair

      While SF2CE might be my favorite, I hold a certain reverence for the original WW. Almost a year ago when I started into the hardware-side of this hobby I made SF2 one of my first board purchases. The board arrived, booted, but sadly had no sound whatsoever. No matter, this noob can use google! Most folks out there point to the Z80 processor and relay with disdain that "Capcom cheaped out, they printed the CPS1 motherboard to have a Z80A but then installed the cheaper Z80". Typically this is the culprit, and since the B board gets in the way of probing anything I just decided to socket and replace the dang thing.



      It didn't work.

      Next, I dove into the schematics (link!) and googled a bit more. That research indicated that 'no sound at all' could either be due to the 3.579 oscillator not working, or the YM3012 DAC IC. Again since the f%$!ing B board gets in the way I just went ahead and bought both from China since they were cheap.



      Upon arrival I tried piggy-backing the YM3012 and boom, sound. Happily de-soldered it and swapped in a new one. I had no sockets the right size, and I'm impatient, so hopefully this one lasts a while longer.

      So another SF2:WW is back to working order!

      multis: cps* ttx2 gnet f3 mvs sega st-v/16b/24/c2/naomi(netboot) sys2x6 m72
      cabs: sega blast city x2 | taito vewlix c + egret ii
      links: klov/vaps games list | custom fight sticks
      projects: some conversions, some repairs
    • After buying a Knights of the Round with 'no audio' I read up a lot on how to troubleshoot and maybe fix the problem. Lucky for my board, there was a missing 10uF 25v tantalum cap on the main board, very close to the volume pot and this fixed my board ! Thanks for putting this info up here though, I actually soldered a speaker to the YM3012 IC to confirm audio did work, before I had the cap available for install.
    • evilsim wrote:

      After buying a Knights of the Round with 'no audio' I read up a lot on how to troubleshoot and maybe fix the problem. Lucky for my board, there was a missing 10uF 25v tantalum cap on the main board, very close to the volume pot and this fixed my board ! Thanks for putting this info up here though, I actually soldered a speaker to the YM3012 IC to confirm audio did work, before I had the cap available for install.
      Nice! If I had this to do over again I’d use my audio probe instead of shotgunning. They’re pretty handy and are akin to soldering on a speaker.

      FS: Walsdawg Arcade Audio Probes
      multis: cps* ttx2 gnet f3 mvs sega st-v/16b/24/c2/naomi(netboot) sys2x6 m72
      cabs: sega blast city x2 | taito vewlix c + egret ii
      links: klov/vaps games list | custom fight sticks
      projects: some conversions, some repairs