开云体育

ctrl + shift + ? for shortcuts
© 2025 开云体育
  1. YamahaCS80fans
  2. Messages
Expanded Topics Messages Polls
Date
Re: CS-80: make a plan for a servicing

 

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@...> 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




?

Re: Clean CS-80 Overall Circuit Diagram

 

Thanks Scott for picking up this one. I added the missing dot to the diagram.
By the way, the D716 diode is missing on the SVU circuit diagram of the service manual, but present on the circuit board (and drawn as a regular diode). It must have been a late added component. (The circuit diagram shows numerous other modifications also.)

Joachim
Power Supply Schematic - Diode D716 Correction

[email protected]
 

Thank you Joachim for your efforts! I have a huge print of the overall schematic hanging in the shop, nice!

I have begun my restoration of an inop unit, starting with the power supply. An error I found on the original drawing is the line that shows diode D716 tied to diode D714. This is incorrect.

The cathode side of D716 should be tied to ground, and the anode side of D714 should be tied to ground. That is, there should be a tie-dot at the intersection of the GND1 line and the line crossing it that connects the cathode of D716 and the anode of D714. This is verified on the actual circuit board here on the bench.

A question for the group is, what is the correct diode type for D716? The (bad) component here pulled from my board was a zener which doesn't match the schematic which shows a regular diode and doesn't seem to make sense as a protection device.

The CS-50 and CS-60 diagrams don't have this diode in the circuit, and the board trace in the CS-80 manual doesn't have it either. The manual board trace does not match my circuit board in several areas. Is there an updated one somewhere?

Thanks,

Scott
Re: Stuck sounds from the CS80

 

Are your TSB boards rebuilt? Just a guess...
Re: CS80 stuck/hanging note

 

did you ever fix this problem? just curious - i'm a bit appalled at the lack of response from forum members
Re: New member, new cs50 owner

 

i don't know if you still need it but there's a pretty good video showing that part/function on youtube -? look up 'Yamaha CS60 restoration' by someone named 'Golt!'
Re: Stuck sounds from the CS80

 

i just had EXACTLY the same problem after a blown fuse due to a bad diode ... by the time i got the PS fixed up I have a constant stuck note with a little LFO on it -frequency is controlled by the LFO slider ... most other panel controls seem to be working too ... I found THIS page on Old Crow's site and it sounded exactly like the? problem - so i tried changing out the chips on my SH board and STILL the same effect ...

one thing i DO notice however is that the 4016 chip is 'full on' ... each pin is at max. voltage - 15v through the Vcc pin and 8.6v through everything else ... so i guess that explains the stuck notes ... but I'm a bit a bit of a loss to explain WHY this is ...

ANYONE?
Re: CS50 blowing uppermost fuse

 

solved. ended up being a bad diode pair (D1)
Re: anyone have CS50 Power Supply pics (underside with wiring) ???

 

got it fixed now thanks
Re: CS80 Trade

Murilo Faria
 

Hi, Boops!

Unfortunately the CS80 is heavy and shipping costs here in Brazil are ridiculous...

Em ter, 25 de set de 2018 às 14:51, boops.secretvibes@... [yamahacs80] <yamahacs80@...> escreveu:

?

Hi
I m a musician and tech since 40 years
I have a collection of good mono poly analog synth ,etc
Send me a mail if interested of a trade
boopsdotsecretvibes@lapostedotnet
Cheers



--
Murilo Faria (Mura)
Re: CS80 Trade

 

Hi
I m a musician and tech since 40 years
I have a collection of good mono poly analog synth ,etc
Send me a mail if interested of a trade
boopsdotsecretvibes@lapostedotnet
Cheers
Re: anyone have CS50 Power Supply pics (underside with wiring) ???

 

Hi ,Murilo
I am musician and tech since 40 years
I have (a collection )restored,built a lot of good poly/mono analog synths OBX eigh voice ,prophet5,synthi,Roland Jupiter ,Buchla 200 stuff etc
If you are interested send me a mail to
boopsdotsecretvibesatlapostedotnet
Cheers
Re: CS80 Trade

 

Hello Murilo

Am 25.09.2018 um 17:05 schrieb Murilo Faria muriloaof@... [yamahacs80]:
Hi, guys, unfortunately things here in Brazil is real complicated and, after 8 year with a CS80 not outputting any sound, I'll get rid of my CS80 (please do not convince me the opposite).

I'm looking for a good deal, so I'm here to check with you guys which synth you would trade for a "broken" CS80 (It turns on, but no sound output. Lot's of the best technicians tried to figure it out without success)? . I have the option of an Arp 2600, Polymoog, Memorymoog. Do you guys think is a fare trade? Any other options? I like A LOT the EMS Synthi AKS but don't know if the guy who owns it would trade...
Just one comment: Don't trade a ship wreck for another boat that is leaking already...

No Polymoogs or Memorymoogs (exception LAMM). An ARP 2600 must be in excellent shape - especially in regards of the faders. An Oberheim Fourvoice (or even Eightvoice) might be soundwise an equivalent exchange for a CS80, but also these are very risky investments...

I think the environmental conditions in Brazil (humidity temperatur) can be extremely difficult for all this old gear. Mostly all connectors and potentiometers of the old gear may not stand such conditions over a longer time.


Florian

--

CS80 Trade

Murilo Faria
 

Hi, guys, unfortunately things here in Brazil is real complicated and, after 8 year with a CS80 not outputting any sound, I'll get rid of my CS80 (please do not convince me the opposite).?

I'm looking for a good deal, so I'm here to check with you guys which synth you would trade for a "broken" CS80 (It turns on, but no sound output. Lot's of the best technicians tried to figure it out without success)? . I have the option of an Arp 2600, Polymoog, Memorymoog. Do you guys think is a fare trade? Any other options? I like A LOT the EMS Synthi AKS but don't know if the guy who owns it would trade...

Thanks!
--
Murilo Faria (Mura)
Re: anyone have CS50 Power Supply pics (underside with wiring) ???

 

Try Old Crow




On Tue, Sep 25, 2018 at 5:56 AM nicolas zenithaudio2003@... [yamahacs80] <yamahacs80@...> wrote:
?

hey friend ! the power is wired in the same way as in the service manual ! jut fallow the wires or send us picture of the mess .?

On Tuesday, September 25, 2018, 1:09:41 a.m. EDT, jw_dewdney@... [yamahacs80] <yamahacs80@...> wrote:


?

OK - let's try this then - does ANYONE happen to have ANY pictures of the UNDERSIDE of the CS50? power supply?? Finally dim bulb tested it and i have a fault somewhere.

PLEASE??

willing to pay if that's what it takes



Virus-free.

--

cheers,
matrix
Re: anyone have CS50 Power Supply pics (underside with wiring) ???

nicolas
 

hey friend ! the power is wired in the same way as in the service manual ! jut fallow the wires or send us picture of the mess .?

On Tuesday, September 25, 2018, 1:09:41 a.m. EDT, jw_dewdney@... [yamahacs80] wrote:


?

OK - let's try this then - does ANYONE happen to have ANY pictures of the UNDERSIDE of the CS50? power supply?? Finally dim bulb tested it and i have a fault somewhere.

PLEASE??

willing to pay if that's what it takes



Virus-free.

anyone have CS50 Power Supply pics (underside with wiring) ???

 

OK - let's try this then - does ANYONE happen to have ANY pictures of the UNDERSIDE of the CS50? power supply?? Finally dim bulb tested it and i have a fault somewhere.

PLEASE??

willing to pay if that's what it takes
Re: CS50 Power Supply wiring question - ACK!

 

alright i got it figured out now - thanks anyway ...

though now I've hooked it up to the wall via an incandescent bulb to test for any faults and there's NOTHING happening - bulb won't even come on ... I have it OUT of the synth and I have the sense lines hooked up properly ... is there any reason that i wouldn't be able to get voltages out of it being hooked up to AC power alone? in vitro as it were?? I thought i'd be able to ... though when i measure the dc resistance across that prongs of the AC cable - I get an open circuit ... I suppose that's NOT a good sign? or??


anyone??
Re: CS50 Power Supply wiring question - ACK!

 

alright i got it figured out now - thanks anyway ...

though now I've hooked it up to the wall via an incandescent bulb to test for any faults and there's NOTHING happening - bulb won't even come on ... I have it OUT of the synth and I have the sense lines hooked up properly ... is there any reason that i wouldn't be able to get voltages out of it being hooked up to AC power alone? in vitro as it were?? I thought i'd be able to ... though when i measure the dc resistance across that prongs of the AC cable - I get an open circuit ... I suppose that's NOT a good sign? or??


anyone??
Re: Cs70m for sale in Phila

 

hmmm - i can't seem to find it ... send us a link????
241 - 260 of 4946