Yamaha CS80

can you explain where the bypass caps go? Is it between the power in  
VccIN on the chip and ps?
Also what about existing capacitors? which should be replaced while I  
am there?

Thanks
Rory M


On Dec 2, 2005, at 9:07 PM, David Rogoff wrote:

> Thorsten Pörschke wrote:
> > Hello David
> >
> > Thank you very much for your quick answer.
> > I wanted to know which pcb (KAS, TKC, TSB1, eg.) you choosed to  
> start with?
> > Did you also overhaul the power supply and if which parts besides  
> the cap.
> > did you changed.
> >
> >
> I don't remember what order I did the boards in.  I did, however,  
> do one
> board at a time and made sure it was still working before I did the  
> next
> board. I did have a couple of solder bridges that took some time to
> find, and generated really weird symptoms.  You need to have a decent
> multi-meter and simple oscilloscope, the schematics (mostly available
> online - see Links), and an understanding of some digital and analog
> electronics, because something will go wrong when removing/replacing
> over a hundred 14 and 16 pin chips!
>
> There's tons of detailed pictures I put on the site (Photos > CS80
> renovation) as I did the work.  The only thing on the power supply was
> replacing all the caps (other than calibrating it).  All 4000-series
> CMOS chips were removed, sockets soldered in, bypass caps added,  
> and new
> chips put in.  I also added larger caps for each board.  I basically
> followed Crow's website.  The biggest help was buying a used
> de-soldering station.  It would have been crazy to try it with just a
> spring-loaded solder remover.  When I was done, I sold it (to the  
> owner
> of the Yahoo oldsynths group).
>
> David
>
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>



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