Yamaha CS80

Had the same problem, on my cs80 TR29 was a broken on the BA board,

good luck

--- In yamahacs80@yahoogroups.com, "Heath Finnie" <heathfinnie@...> 
wrote:
>
> This is a big question here. The CS-80 I'm working on will barely 
change pitch all the way up 
> the keyboard now. Some keys will play a little lower but not much. 
Now here are the 
> symptoms:
> 
> I replaced most all the IC's on the sub board. I replaced the 
entire KAS board with a working 
> one. Problem does not change.
> 
> The pitch ribbon is having no effect on pitch. Neither is the pitch 
knob.
> 
> The channel 2 detune IS working as is the footing sliders.
> 
> Ring modulator is working, sub oscillator is working and so is all 
the waveforms.
> 
> Any of the tech guys able to help?
> 
> Thanks!
>