Thanks very much, Mike and Laurie for the feedback. I know my way around
a workbench and am reasonably competent with a soldering station and
multimeter, but the bulk of my vapor inhalation time has been spent on
PC motherboards and smaller project kits. I know the CS is a very
different animal.
Would it be worth rebuilding the PSU, SH, TKC and TSB 1/2 boards, which
I consider reasonably straightforward component replacement jobs, before
having it serviced? I could buy all of Gavin's rebuild kits along with
a pretty nice new Hakko solder/desolder station for the equivalent of 18
hours of time at the shop I know of (about 2 hours away in Austin). I
certainly don't want to be penny-wise, pound-foolish about this, though.
I had already planned on doing those rebuilds over the next year or two
to replace the time-sensitive parts (caps, CMOS, etc.) and to get myself
comfortable with providing the care and feeding the CS requires.
Ultimately, I would like to be my own tech, but I'm not arrogant enough
to think I know everything I need to know today. =-)
Right now, the only reputable synth repair shop I know of is Switched On
in Austin. If anyone has a recommendation for techs in Houston or
Dallas/Ft. Worth, please let me know.
Thanks!
r.
--- In yamahacs80@yahoogroups.com, "Laurie Curry" <laurie@...> wrote:
>
>
> I agree.....
>
> Â
> -----Original Message-----
> From: Mike mborish_2000@...
> To: yamahacs80@yahoogroups.com
> Date: 03/25/12 10:44
> Subject: [POSSIBLE SPAM] [yamahacs80] Re: I hope this is something
simple...
>
> There's a lot that can go wrong. I suggest that you find a competent
technician. Do not turn it on again unless you know what you are doing.
If you are in Chicago I can help.
>
> -Mike
> 312-363-7286
>
> --- In yamahacs80@yahoogroups.com, "Ray Toler" Ray@ wrote:
> >
> > Greetings all. I finally acquired a CS-80 last week and have been
enjoying it immensely. Today, I tackled tuning it up and that went very
well well. I did not raise the card rack to do the tuning.
> >
> > The next issue I wanted to tackle was some wonkyness with the
aftertouch. The scaling on voice 4 was way off. It would jump straight
to maximum volume and filter, but the modulation rate was much slower
than any of the other voices. I decided to try calibrating the TRG cards
in the hopes it was just that and not the TKC or TSB boards.
> >
> > Upon inspecting the TRG cards, I decided I probably needed access to
the bottom of the card rack, so I removed the screws and raised it.
Here's the bad part. I didn't turn the power off, thinking that since it
would be adjusted with the rack up, it didn't matter. Obviously a
mistake in hindsight.
> >
> > As I got near the locking position, the left side slipped down just
a bit. I think I put minor pressure on the cable bundle over the lowest
group of key switches with the heel of my hand, but I'm not sure. I
heard a couple of higher register notes sound with some "pitch bend" to
them, then they stopped. It was maybe 1 second of sound. I got the rack
up and locked with no further problems.
> >
> > But now there's no sound. The board powers up with no problem, the
patch select buttons all light up, I hear the same transformer hum, as
before but I can't get any voices to sound. I've inspected all of the
wire connections on the card rack and near the key switches and can't
find anything that looks broken or out of place. I don't know what to do
next and am feeling pretty sick about the whole thing.
> >
> > I'm hoping that this is something very simple (e.g., "put the card
rack down, you idiot") or something reasonably simple (e.g., "you fried
the SH board chips and welcome to solderville"). I'm going to power it
off for the night and see if it's just mad at me.
> >
> > I've provided additional details / symptoms below in case they'll be
helpful, but this may be something common. I would greatly appreciate
any help or suggestions you can provide!!
> >
> > Ray
> >
> > Additional Symptoms and things I've done / noticed:
> >
> > 1. I've put the rack back down and closed the lid.
> > 2. I've verified that all patch buttons light up correctly.
> > 3. With the volume at full max, and my monitors turned up reasonably
high, I can hear a "voice noise" / ghost tone - extremely faint and
probably a sine wave. I've observed the following additional things with
regard to that.
> >
> > ∗ The sliders and switches for voices I and II have no effect on the
tone.
> > ∗ The patch select buttons have no effect on the tone.
> > ∗ I can tell that the detune slider is detuning channel II
> > ∗ The ring modulator appears to be working on this "ghost tone" but
is very faint
> > ∗ The sub oscillator section has no effect on the tone
> > ∗ Changing the Feet setting works correctly on the tone.
> > ∗ The after touch section ∗does∗ work on the tone, but it's like
aftertouch is always present. Pressing a key doesn't change the
modulation further.
> > ∗ Moving the keyboard Brilliance and Level controls makes the pitch
of the tone go up and down (up when slider moves up, down when it moves
toward keys.) Each slider can change the tone individually, but the
range isn't as big as when moving all four together. Setting them
equally opposite (e.g., 2 up, 2 down) results in no pitch change.
> >
> > Thanks again for any help or pointers you can provide.
> >
>
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