Yamaha CS80

Congratulations! It's a wonderful beast. Just a quick comment. I would approach things differently. I would hunt down and fix just the known problems, and any more I did find after it got it mostly working. Then calibrate it fully. Only then would I consider any sort of upgrade or changing out of parts. My reasons are "if it ain't broke, don't fix it" and also we only have so much time and $ in this world; I'd rather spend it playing the beast than looking at a pile of parts and hoping that someday I can play after it's been hardened/upgraded to survive the "Next" 50 years.

Cheers,

Kyle


> On January 9, 2019 at 5:24 AM "pepeisnotadog@... [yamahacs80]" <yamahacs80@yahoogroups.com> wrote:
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> 
> 
> 
>     Hi,
> 
> 
>     i have a CS-80 that needs a review. Unfortunately (not by me) has been left unused for a long time, 3 voices don’t work (and i hope they are not the Yamaha IC chips ..). In short, it’s a moral duty to bring it back to life.
> 
> 
>     My initial plan was this (but i ask you any advice):
> 
> 
>     1) start with power supply, replace old electrolytics cap. Are there any other parts that you recommend to change?
> 
>     2) go to the five boards (KAS, SH, TKC and the two TSB) under the keyboard:
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>     - replace all the electrolytics
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>     - replace all the CMOS (maybe installing new sockets)
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>     - add decopuling cap for the IC (based on your experience is it better to buy “built-in sockets with caps” or solder the caps separately?)
> 
>      
> 
>     Given that I am still defining the plan, do you also recommend these operations (or just some of them) for these five boards?
> 
>     - replace old op amp
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>     - replace old bjt
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>     - replace all the ceramic disc capacitor (with dipped ceramic)
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>     - replace all the "famous" tantalum capacitor (with polystyrene or polypropylene or aluminum electrolytics, same value obviously)
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>     - replace all the mylar capacitor with polypropylene or polystyrene
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>     - replace the few old trimmers
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>      
> 
>     Going to the boards behind the keyboard..
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> 
>     Regarding all M Boards:
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>     -     r  replace all the electrolytics
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>     -          replace all the old trimmers too?
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> 
>     Regarding the two KBC Boards:
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>     -          replace all the electrolytics
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>     -          replace all the CMOS (maybe installing new sockets and decopuling cap for the IC (like the boards under the keys)
> 
>      
> 
>     I definitely forgot something, but i'm slowly making a plan before start any work on this beautiful machine. Of course I will surely meet some unexpected events during the overhaul;)
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>     Sorry if i was too wordy, but this group is the right place to talk about it!
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>      
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>     Best (and thanks in advance for your cooperation)
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> 
>     Mark
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>     
>