Yamaha CS80

I recently broke a diode while having the BA-board turned upside down 
for desoldering the opamps. At that moment, the highest 4 keys all had 
the same pitch. I was lucky I could find the bad component because the 
broken diode could be seen by eye. In your case I would desolder all 
diodes and check them. Good luck.

--- In yamahacs80@yahoogroups.com, "Heath Finnie" <heathfinnie@...> 
wrote:
>
> Thanks Kyle, I do find it weird though that any combination of TR29 
and IC3 being both in 
> the pitch problem is there and when one of either of them are removed 
the pitch problem 
> goes away. It seems that if there was another issue like you 
mentioned, wouldn't it 
> probably not be this specific?
> 
> I've pretty much replaced everything on the lower half of the BA 
board. all the diodes, 
> most all the resistors, IC1, IC2, IC3 and IC4, TR29 and both fets. 
Somewhere around IC3 
> and TR29 the pitch goes haywire.
>