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.
>