Yamaha CS80

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?
> > >
> > > 	
> > >
> >
>