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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