Yamaha CS80

--- In yamahacs80@yahoogroups.com, "slipperysoles" <slipperysoles@...>
wrote:
>
 him.
> 
> 1)Suboscillator does not work: no matter what waveform selected, there
> is no modulation on either VCO, VCF or VCA. Speed does not do
> anything. As a consequence the corresponding aftertouch features do
> not work either.  Routing Noise to the parameters mentioned above does
> result in (some) effect. Any ideas?

Bad VCO chip?  Looks like IC5 on the SUB board:
http://d.yimg.com/kq/groups/13287191/or/1278022767   Easy to check
with a 'scope (if you bought a CS80 you should/must pick up a $50 used
oscilloscope) or even an audio amp if the speed is set high.