Archive of the former Yahoo!Groups mailing list: 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:

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:

- replace all the electrolytics

- replace all the CMOS (maybe installing new sockets)

- 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

- replace old bjt

- replace all the ceramic disc capacitor (with dipped ceramic)

- replace all the "famous" tantalum capacitor (with polystyrene or polypropylene or aluminum electrolytics, same value obviously)

- replace all the mylar capacitor with polypropylene or polystyrene

- replace the few old trimmers

 

Going to the boards behind the keyboard..

Regarding all M Boards:

-     r  replace all the electrolytics

-          replace all the old trimmers too?

Regarding the two KBC Boards:

-          replace all the electrolytics

-          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;)

Sorry if i was too wordy, but this group is the right place to talk about it!

 

Best (and thanks in advance for your cooperation)

Mark