Yamaha CS80

Hi Tom,

welcome to this list, I´ve been missing you quite a bit on AH... :-).

Stephen

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"Ambition makes you look pretty ugly, kicking squealing Gucci little piggy." (Thom Yorke/Radiohead -- "Paranoid Android") 

Stephen Parsick live in concert: Bochum Planetarium (Germany), 13th of December, 2008, 08:00 pm.

Finally available: Stephen Parsick -- Traces of the Past Redux, reissued with three previously unreleased bonus tracks. For more info please check www.parsick.com

For legal downloads please check:

http://www.musiczeit.com/directory.php?artist=296&title=Stephen+Parsick


  ----- Original Message ----- 
  From: tmoravan 
  To: yamahacs80@yahoogroups.com 
  Sent: Wednesday, March 04, 2009 2:04 AM
  Subject: [yamahacs80] New to the group, but maybe not to some


  Hello, I hate joining a group just to get a question answered or problem solved, so I'll try to stick around and be as helpful as I can be.

  In addition to the other old synths and effetcs I've accumulated, I have a CS-80 here that I'm repairing.

  It's got a weird problem and I wonder if anyone has seen this before. It plays normally as long as I don't pres any keys in the topmost octave.

  I popped the hood and traced it down to the YM26700 D/A converter on the KAS board. Well, at least I think that's the problem. Here's what I measured:

  pins 19-30 are getting the correct voltages for each key in the octave,
  pins 13-18 have the correct voltages for the octaves (0.125 through 4),
  pins 5-8 are reacting correcting for each key in the octave,
  pins 9-11 are reacting correctly to indicate the octaves,

  pins 31-38 (channels 1-8) output the correct voltages up and down the keyboard until I press keys in the upper octave. If I press a key up there, the voltage reading drops into the negative (i.e. -2.5v, 3.5v, etc).

  Could there be anything outside the 26700 causing this behavior?

  If not, are there any sources for a YM26700?

  If not, who wants to buy a CS50 or 60 with me for parts?

  Oh - I do happen to have a handful of lever switches, keys (white and black), some panel buttons w. bulbs, and the entire 4-bank 'memory' board that fits under the flip top panel, so I'm not coming here completely empty handed...

  thanks,

  Tom



  

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