[sdiy] CS-50

[synth at charlielamm.com]

This may be of very little use, but, I had a CS-50 about 20 years ago that
may have had the exact same issue.  You could barely hear the filters
sweep if you really cranked it up, but otherwise, no audio output at all
for any voice.

I recall the tech who fixed it replaced a single chip (not each VCA or
whatever) and I also think it was some sort of proprietary Yamaha chip as
opposed to something like a single 4016.

I don't remember which chip it was, though.

On Wed, 27 Aug 2003, Gavin & Delia wrote:

> I know there are some Yamaha CS pros out there, in fact I'm a bit of one
> myself but this issue has me stumped.  Audio-wise I get real low or no
> output on all 4 voices.  Originally the keyboard wasn't affecting the sound
> either but I discovered the culprit was a blown 4016 on the S/H board.  I've
> traced both signal and CV all the way to the VCA section of the M (voice)
> boards and it all looks good, but on at least one if not more of those SIP
> iG001501 (?) chips there's no or low output.  Looks like blown VCA chips,
> but seems strange that they would all go like that, so maybe something later
> on pulling down the output?
> Just checking in to see if anyone's had a similar issue before I spend
> another big block of time pulling my hair out tracing out the signal path!\
> thanks
> G.
>