Yamaha CS80

Hi Max,

Personally i'd just add decoupling caps and replace ALL the CMOS in  
the unit with new TI stuff. All the old CMOS in the unit will fail -  
i'm actually surprised it has lasted this long. CMOS is pretty cheap  
though if you are using good quality Mil-Max machined sockets the cost  
increases by a rather a large amount  :) Also, if you replace all of  
the parts in the PSU with new ones you can basically avoid the root  
cause of all these issues. I'd also check all of the voltages with a  
very high precision multimeter if possible, just to get it spot on.

In any case, you will get a CS80 that will be inherently more reliable  
or at least a lot closer to how it was out of the factory.


Andrew

On 05/04/2011, at 4:56 PM, max fazio wrote:

> Hi Andy
> I've read somewhere about a custom project which enabled to isolate  
> the most critical points (KAS, SH, TKC) from occasional shocks and  
> PSU failures; anyway it looks pretty foggy to me, as I've read about  
> it many years ago and lose the documentation! Did you have some more  
> infos?
> Thx
> M
> --- In yamahacs80@yahoogroups.com, kirkbyte@... wrote:
> >
> > Hi Max,
> >
> > That is good news. Just as i had suspected...
> >
> > Where do you want to put more fuses?
> >
> > Andrew
> >
> >
> >
> > > max fazio <faxiomas@...> wrote:
> > >
> > > Hi all
> > > Happily we solved the problem: 2 4016 CMOS brought their soul  
> back to
> > > the Almighty but , at least, no other problem was found; can  
> anybody
> > > tell me about how to modify the tracks in order to be able to  
> put more
> > > fuses?
> > > Thx
> > > --- In yamahacs80@yahoogroups.com, "Max Fazio" <faxiomas@> wrote:
> > > >
> > > > Hi
> > > >
> > > > Sounds like some CMOS shorted out. Which fuse blew?
> > > >
> > > > Apparently the one on the left if you look from a higher pov  
> with the
> > > keyboard in front of you
> > > > Update: now tensions are regular, those with scary settings  
> are the
> > > ones between KAS and SH
> > > > M
> > > >
> > > >
> > > > ----- Original Message -----
> > > > From: Andrew Kirkby
> > > > To: yamahacs80@yahoogroups.com
> > > > Sent: Sunday, April 03, 2011 4:32 PM
> > > > Subject: Re: [yamahacs80] Help! Note mess!
> > > >
> > > >
> > > >
> > > > Sounds like some CMOS shorted out. Which fuse blew?
> > > >
> > > > Sent from my iPhone
> > > >
> > > > On 04/04/2011, at 12:27 AM, "max fazio" <faxiomas@> wrote:
> > > >
> > > > > Hi all
> > > > > I'm writing on behalf of Fernando who's got another problem  
> with
> > > his machine which was eventually about to be fully restored.
> > > > > While removing one board in the voices' rig, one of the fuses
> > > suddendly blew up and the main voltage jumped to +20V. After he  
> restored
> > > the correct voltage he experienced all kinds of weird sounds  
> coming off
> > > the CS-80.
> > > > > I only hope that the KAS didn't break up, so please can you  
> give
> > > me any advice or diagnosis about this problem.
> > > > > please help
> > > > > M
> > > > >
> > > > >
> > > >
> > > > [Non-text portions of this message have been removed]
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > [Non-text portions of this message have been removed]
> > > >
> >
>
>
> 

Andrew Kirkby
(e) kirkbyte@...
(m) 0416 000 070






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