[sdiy] Yamaha CS-50 high pitched voice

[The Old Crow]

  The tuning procedure for the CS-50 is pretty much the same as for the 60 
and 80.  I have the actual CS-50 procedure here somewhere; I just need 
tofind it and hope it scans well.

  A stuck high pitch on any voice means almost certainly that the 
sample/hold circuit for that pitch CV has gone bad--just replace the 4016 
and 4011 chips on the SH board.  It is also possible that one of the S/H 
circuits has failed on the KAS board; I would replace the 4016 there if 
repalcements on the SH don't fix the problem.  These parts are super cheap 
and widely available--just take care when doing soldering work.

Crow
/**/

On Sun, 4 Jul 2004, doof wrote:

> Hi all,
> 
> I recently acquired a nice CS-50 cheaply, but alas the voices are not
> completely in tune (surprise, surprise).  Is anyone here familiar with
> the tuning procedure? I've found the CS-80 procedure on the web but I'm
> not sure how applicable it is to the 50.  The particular symptom that
> has cropped up is that the fourth voice has an extremely high pitch when
> played.  Any ideas/pointers?  Thanks.