Hi,
In my book that would be step 4.
Before you do anything make sure the tune pot is centered trim the
power supply, then check the TU pin on the KAS for 4.00 volts.
Then pin 6 of the lm310 for 0.125 volts holding down bottom C.
You need to check pin 38 as well as pin 13 on the YM2700 as one will
effect the other.
If you still get no luck let me know.
Kent
--- In
yamahacs80@yahoogroups.com, "willgregori" <will.gregory@...>
wrote:
>
> VR1 has something to do with the global tuning i guess, i just
wonder
> why it does not affect the Volatge on pin13 IC2- as it is
described
> in the tuning manual.
>
> Since i am an absolute beginner in tuning a cs-80 i just follow
the
> instructions, i have no clue what is important and what can be
> skipped.
>
> Actually my particular CS-80 is from switzerland, it belonged to a
> collector who had an enormous collection of vintage synths (bought
> also 3 racks of system 100m there)in a dusty warehouse. Shame on
me,
> this was in 2001 already and I did not find the time to take much
> care of this CS-80 yet...I have just too much other synths which
> needed service and the cs-80 seems to be a true masterpiece in
terms
> of maintenance...
>
>
>
> --- In yamahacs80@yahoogroups.com, rj krohn <r_j_d_2.phila@> wrote:
> >
> > ive never tuned one via DVM. why dont you tune it via the audio
> output? does VR1 affect output pitch? sure you've got the right
> voice? sorry if im oversimplifying something about your
situation....
> >
> > oh, and as cs-80 nerds, im sure we all would be intrigued by the
> instruments back-(and fore-) story.
> >
> >
> > --- On Sat, 8/9/08, willgregori <will.gregory@> wrote:
> > From: willgregori <will.gregory@>
> > Subject: [yamahacs80] Expert question- Tuning procedure - stuck
at
> step 2
> > To: yamahacs80@yahoogroups.com
> > Date: Saturday, August 9, 2008, 12:49 PM
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > Dear CS-80 friends,
> >
> >
> >
> > i am currently restoring a CS-80 which collected dust for some
10+
> >
> > years in a warehouse. Fortunately everything seems to work so
far,
> but
> >
> > of course the tuning is a bit off.
> >
> >
> >
> > When starting the tuning procedure i cannot go beyond step 2.
> According
> >
> > to the manual Value at pin 13 of IC2 KAS board should be set to
> 125mV.
> >
> > Mine stays always at 135mV- no matter how i turn the
corresponding
> VR1
> >
> > pot. VR1 pot itself is ok though.
> >
> >
> >
> > Anybody has a hint?
> >
> >
> >
> > Thanks, Gregor
> >
> >
> >
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> >
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> >
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> >
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> >
> > [Non-text portions of this message have been removed]
> >
>