Yamaha CS80

Hi Doug,

Exactly , you are right . You want to play this instrument maybe even on a daily basis but then it needs to stay in tune and stay reliable. The parts that are in there are very old. Capacitor values are probably degraded . 4000 series CMOS chips from the seventies are never as good manufactured as the parts today.
Read the article by Old Crow's Synthshop CS-80 repair. It explains why we should do that. 
Think of it more as a oil change on a car. Just take your time don't rush things ! Start with the power supply , recalibrate it and go from board to board. 
At last work on the M-boards (voice boards) . That probably is the most challenging . And then the finally job restoring to factory specs and tuning.
It's worth it .

With kind Regards

Csaba

 
On Feb 25, 2011, at 8:42 AM, Douglas Rodriguez wrote:

> Csaba,
> Thanks for the reply and sharing your advice.  Why should I replace components that seem to be working properly?  Is there any harm in waiting for something to break rather than "fix" it first?  What will happen if I don't?
> Doug
> 
> --- On Sun, 2/20/11, Csaba Zvekan <czvekan@...> wrote:
> 
> From: Csaba Zvekan <czvekan@...>
> Subject: Re: [yamahacs80] My own CS-80
> To: yamahacs80@yahoogroups.com
> Date: Sunday, February 20, 2011, 5:57 AM
> 
> Hi Doug,
> 
> Long story short : if you are pretty good with the soldering iron I  
> would start replacing the 4000 series CMOS chips , make sockets and  
> put additional bypass capacitors. Replace systematically all  
> capacitors starting with the power supply. That way you could rest  a  
> sure that the Yamaha custom chips are a bit out of the danger zone.
> How ever this is not a ten minutes job . Take your time as it is  
> worth the work and effort. If you have questions we are glad to help  
> you.
> 
> Kind Regards
> 
> Csaba Zvekan
> 
> On Feb 20, 2011, at 8:42 AM, effegee wrote:
> 
> > Hi. I'm new here. I just acquired a CS-80 that originally belonged  
> > to Oscar Peterson, who sold it when he put together a Synclavier  
> > system. The guy I bought it from has played on records for Bon  
> > Jovi, Aerosmith, the Cult, Scorpions, etc. He had the CS-80 for 16  
> > years, keeping it in the studio and storage, and never once had it  
> > tuned. I'm amazed, because the tuning sounds great. There is one  
> > dead (or barely audible) voice on Ch. I, but everything else seems  
> > in working order, and it sounds great. This is the first CS-80 I've  
> > ever played and I'm having fun exploring is sonic and expressive  
> > possibilities. I'm planning on having a synth tech a few hours away  
> > in Seattle work on the dead voice and tune it, and I'm looking at  
> > having the Kenton MIDI installed (though I don't know how I feel  
> > about drilling into the beautiful front panel to install switches--  
> > we'll see).
> >
> > I also own an Arp 2600, the internals of which I had overhauled by  
> > an Arp specialist (Cirocco). When I go it, the Arp's enclosure was  
> > so water damaged and the hinges & corners so rusted that I had to  
> > have a new enclosure made for it. Fortunately I have a woodworking  
> > friend who replicated the original enclosure out of plywood and I  
> > tolexed it (using the old tolex as a pattern), and put on the  
> > corner/hinges/handle hardware, hand-setting every rivet. That was a  
> > huge, weeks-long project, but I learned a lot about tolex, rivets,  
> > hard-to-find case hardware, and people that shamelessly lie to you  
> > on eBay about what they're selling you. In the end, I have the most  
> > mint (if not original) cases for an Arp 2600 in existence. If only  
> > it could hold it's tuning as well as the CS-80�
> >
> > So, back to the CS-80: I'm somewhat concerned. With all of the  
> > reading I've done here and on the net about replacing parts, etc.,  
> > I feel like I'm sitting on a time bomb. Is my CS-80 going to just  
> > stop working one day? I understand that there are aging components,  
> > but I don't know what I need to do right now for a unit that seems  
> > to be functioning well. It seems that I should have the power  
> > supply refurbished (Circuit Solutions kit) based on what others  
> > have written, but what about the other stuff? Should I wait until  
> > something breaks before I have it fixed? Or is there potential for  
> > worse damage if I don't do something now? I want to do what's best,  
> > yet avoid overkill.
> >
> > I'm glad to be here. Thanks for letting me share.
> >
> > Doug
> >
> > 
> 
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> 
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