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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>
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>
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