Yamaha CS80

Hi Andrew,

The only time I ever had anything similar to this was a fault affecting mainly the after touch - but also, I seem to remember there were actual *note* issues. The fault in my case was around one of the TSB boards. I turned out to be one broken wire! What I would do in the first instance is play those high notes that are the problem - whilst gently moving the wires going to the boards - TSB, TKC and KAS.

Have you been handling any of these boards repeatedly? Turning them to and fro during re-capping for example can I would guess, cause problems.

Cheers
TOM


--- In yamahacs80@yahoogroups.com, Andrew Kirkby <kirkbyte@...> wrote:
>
> ok,
> 
> So, all keys up until the top D key work fine. If i press a single key  
> above top D i get no sound whatsoever BUT if i hold a key below the  
> top D key and one above at the same time it will produce the note  
> below top D correctly and the note above with lots of distortion and  
> the wrong pitch.
> 
> If i press 8 keys located below the top D key, all voices work fine so  
> i know it's not an issue with a M board.
> 
> I have checked the ICs on the lower boards and have found some strange  
> behaviour on IC12 of the KAS board (4016). If i measure the voltage  
> between ground and pins 8 or 9 while pressing a low key on the  
> keyboard, i get a small voltage (1-3 volts) on the meter. If i press a  
> key above that D key i get a negative voltage around -4.5 volts. No  
> lower key press gives a negative voltage.
> 
> 
> Andrew
> 
> 
> On 16/07/2011, at 5:19 AM, Quazimodo wrote:
> 
> > That don't make sense... can you explain it better Andrew..!
> >
> > "...unless a key from an octave below it" ...?
> >
> > --- In yamahacs80@yahoogroups.com, Andrew Kirkby <kirkbyte@> wrote:
> > >
> > > I now have another problem on the top octave now - i can't get any
> > > sound unless a key from an octave below it, then i get crazy sounds
> > > without correct pitch. Looks like a morning on the scope is  
> > needed :)
> > >
> > > AK
> > >
> >
> >
> > 
> 
> Andrew Kirkby
> (e) kirkbyte@...
> (m) 0416 000 070
> 
> 
> 
> 
> 
> 
> [Non-text portions of this message have been removed]
>