Your problem is on the BA board by the sounds of it. Pull the TU and
see if the wire has 13ish volt sitting on it.
--- In
yamahacs80@yahoogroups.com, "Heath Finnie" <heathfinnie@...>
wrote:
>
> Hi David,
>
> All three fuses are good and all my supply voltages are there. As
I said, I know the KAS
> board is good because I replaced the entire board after this
problem started and its still
> there.
>
> I also tried calibrating the KAS board and I'm getting very
strange things going on. For
> instance on wire TU the calibration says I should be getting 4.v
for a reference voltage but
> I'm getting almost 13v. None of the VR's are doing anything either.
>
> --- In yamahacs80@yahoogroups.com, David Rogoff <david@> wrote:
> >
> > I've had CS80s do this when I've shorted something and blown one
of the
> > DC fuses in the power supply. Are you sure all the supply
voltages are
> > there?
> >
> > Heath Finnie 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?
> > >
> > >
> > >
> >
>