Vintage Synth Repair

Hm, never knew this group existed til now.  In any case:

  The CS-50/60/80 'M' (master) voice boards are nearly identical 
among the 3 instruments.  If you look at:

http://www.cs80.com/docs/schem/cs80_circ5.jpg

  You can see the two FET switches that gate the saw and pulse 
waveforms to the filters.  My bet is the saw switch-FET died, or its 
control transistor died.

Crow
http://www.cs80.com/
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--- In vintagesynthrepair@y..., "Fin" <fin@w...> wrote:

> I have one faulty voice card in a CS-60.
> The sawtooth waveform is not present at the output, the pulse wave 
>is. I know that the Yamaha chip producing both the waveforms is fine.
> 
> Does anybody have a scan for the schematics of the CS-60 voice 
>cards?