Re: Replacing bulb on Yamaha CS-80 expression pedal?
Hello Mathias,
I do not have had to deal with problems in my expression pedal,
but I have some ideas how it works (I'm a tech guy) I would lend
you a hand.
The mechanism has 3 parts.
1.- A lighting device (the bulb)
2.- A Light obstruction mechanism
3.- A photo resistor cell
The plug has 3 terminals. One is common, the other is the lamp
power source and the last is the variable resistance that modify
the volume.
If you do not see a light even in the pedal assembled, there is
something wrong, lamp or power.
If you open the pedal you will have the chance to check what is
wrong and more important make a further test.
Even if the power source of the lamp is wrong, you can allocate a
lighting device in the neighborhood of the lamp, and if move the
volume control, you will notice that it works (if everything is OK
inside the CS-80).
I do not know how skilled in electronics are you to go ahead, let
me know.
Let me tell you that I do have a CS-80 and both original pedals.
I got it in bad electronics condition from the official support of
the brand (the unit was a demo unit, never sold that fail and
could not was possible for them repair it). I could do it... it
happened about 30 years ago.
Have a nice? day!,
Gustavo.
On 2022-08-17 7:43 PM, Mathias Tjonn
wrote:
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Greetings fellow synth travelers,
?
So, I finally found an original expression pedal for my CS-80
after many years of searching...and it doesn't work. I
understand there's a 24v5w bulb in there and thought perhaps it
has burned out, anyone here have any experience opening these
pedals up and replacing the bulb?
Any hints and help greatly appreciated!
Mathias
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Re: Replacing bulb on Yamaha CS-80 expression pedal?
Hi Stan,
Thank you kindly for the offer, but since I just bought an original pedal, I'd like to find out if the problem lies with it or with my CS-80 (if not, even if I buy your pedal, the issue would remain). Appreciate the offer, though!
Anyone here have any hands-on experience with taking these pedals apart and attempting to fix them?
All my best,
Mathias
|
Re: Replacing bulb on Yamaha CS-80 expression pedal?
Hi,
?
I have a pedal I am not using. ?I sold my CS80and found it later.? I you are interested let me know.? I would like to get $200.00.? That’s what I paid for it about 10 years ago.?
Stan
?
Greetings fellow synth travelers,
?
So, I finally found an original expression pedal for my CS-80 after many years of searching...and it doesn't work. I understand there's a 24v5w bulb in there and thought perhaps it has burned out, anyone here have any experience opening these pedals up and
replacing the bulb?
Any hints and help greatly appreciated!
Mathias
|
Replacing bulb on Yamaha CS-80 expression pedal?
Greetings fellow synth travelers,
?
So, I finally found an original expression pedal for my CS-80 after many years of searching...and it doesn't work. I understand there's a 24v5w bulb in there and thought perhaps it has burned out, anyone here have any experience opening these pedals up and replacing the bulb?
Any hints and help greatly appreciated!
Mathias
|
Re: M Board problem - heat related.
BINGO!?
Changed the VCOs socket and all is fine.
Thanks Tommy, thanks everyone for your quick responses.
Happy end.
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Re: M Board problem - heat related.
Hi. Yes, the problem? The IC VCO Socket !! many years ago, with the same problem I resolve only changing the Socket. ?
Il ven 8 lug 2022, 10:19 pyjamagroove via <pyjamagroove= [email protected]> ha scritto: Hi guys,
So one of my M Boards (°4 on CH I) goes silent after a warm up. I have established that the tuning goes down to the point that it's not auditable. The problems that it is almost Impossible to trace because when I take it out for inspection it cools down and sounds ok again (in tune! ).
Here is what I did so far:
1. Cleaned VCO's legs and applied fresh heat conducting agent between the IC and the diode.
2. I have bought that I have the same issue as MFox (described here ?so I have changed the IC3. Dod not work.
As I sad the problem is diagnostics. Did anyone have a similar problem?
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Re: M Board problem - heat related.
What I would try is using a hot air station with adjustable temperature and see if I could locate the faulty component that way. ?
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On Jul 8, 2022, at 4:25 AM, pyjamagroove via groups.io <pyjamagroove@...> wrote:
? [Edited Message Follows]
Hi guys, So one of my M Boards (°4 on CH I) goes silent after a warm up. I have established that the tuning goes down to the point that it's not auditable. The problems that it is almost Impossible to trace because when I take it out for inspection it cools down and sounds ok again (in tune! ). Here is what I did so far: 1. Cleaned VCO's legs and applied fresh heat conducting agent between the IC and the diode. 2. I have bought that I have the same issue as MFox (described here ?so I have changed the IC3. Did not work... As I sad the problem is diagnostics. Did anyone have a similar problem?
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Re: M Board problem - heat related.
Thanks Florian for your response.
I have to admit that you method is pretty hardcore! Personally I am afraid to do that - I might fry something in the process and there is way to many "points of interest" to check...maybe I will put the card it a sock or something..
What bothers me is that I can't find any topic on the subject (radically heat affected tuning). I suspect the transposition circuit (a FET or transistor going bad).
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Re: M Board problem - heat related.
Hi
Am 08.07.22 um 10:19 schrieb pyjamagroove via groups.io:
The problems that it is almost Impossible to trace because when I
take it out for inspection it cools down and sounds ok again (in
tune! )._._,_._,_
I had once a similar issue (a thermal problem disappears when the
card is take out and or the lid is open), so I soldered long wires?
(about 60cm / 2ft long) to all points on the card I wanted to
measure. The wires led to a gridstyle breadboard which could be
placed on the keyboard, while the card is mounted and the lid is
closed. So I could measure at least a few selected signals of this
card on this breadboard while lid is closed.
regards
Florian
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M Board problem - heat related.
Hi guys,
So one of my M Boards (°4 on CH I) goes silent after a warm up. I have established that the tuning goes down to the point that it's not auditable. The problems that it is almost Impossible to trace because when I take it out for inspection it cools down and sounds ok again (in tune! ).
Here is what I did so far:
1. Cleaned VCO's legs and applied fresh heat conducting agent between the IC and the diode.
2. I have bought that I have the same issue as MFox (described here ?so I have changed the IC3. Did not work...
As I sad the problem is diagnostics. Did anyone have a similar problem?
|
Michael: Other than the guy in California you mentioned, I don't know of anyone with parts like that. Most everything I know of are boards and chips. The later model CP-30 pianos had the same key switches if you can find someone with one of those of the right vintage?parted out. On the other hand, with careful work, the one you have there could likely be bent back to a usable shape. I'll keep my eyes out for a lid.
Scott
Hey guys,
Just wondering if anyone has a husked cs80. I’m looking for two parts.
Specifically the glove box door that covers the “memories” faderbank, and one leaf key contact.
Both are pictures below.
Thanks in advance! Michael
|
Hey guys,
Just wondering if anyone has a husked cs80. I’m looking for two parts.
Specifically the glove box door that covers the “memories” faderbank, and one leaf key contact.
Both are pictures below.
Thanks in advance! Michael
|
Re: Tech recommendations in or around Los Angeles
Paul Morte Technical Services in Orange, CA does good work on CS-80's.
On Thu, Mar 17, 2022 at 2:26 PM T.M. Bois via <bucklehorse= [email protected]> wrote: Hi folks,
I’ll finally be moving my CS80 down the coast to my new home in LA in a couple of months, and I’ve been thinking of giving it a long overdue ‘spa treatment’—replacing decaying caps/CMOS chips and hopefully eliminating a few minor aftertouch gremlins in the process.
Does anyone know who the trustworthy/non-CS80phobic technicians are in this part of the world?
Thanks in advance. ?
|
Ok thanks for the input. I can certainly deal with that.?
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On Mar 17, 2022, at 1:20 PM, T.M. Bois via groups.io <bucklehorse@...> wrote:
? As long as we’re talking just a few cents off in either direction, I always understood this was standard behaviour, and why it’s suggested that you let the synth warm up to a stable operating temp before tuning it—a rule that applied in ‘76 as much as it applies today. I’ve got the older tuning pots on mine and the tuning definitely drifts a bit as it warms up/cools down.?
Given all of the calamitous problems that can arise in a CS80 following a service, I’d say you’re in pretty good shape if this is the worst of them. ;)
On Mar 17, 2022, at 11:09 AM, Alexander488 <alexander488@...> wrote:
? Hi Scott, I don’t know. I can ask the technician, he would likely know since he said he had to wait for it to warm up before he could calibrate that voice.? On Mar 17, 2022, at 1:04 PM, Scott Rodriguez <synthrodriguez@...> wrote:
? My expectation is that the chip has become defective. There's not much else that would do that and stabilize after 15 or 20 minutes as you describe.
How far out is it when it's cold before it warms up? A few cents? A half-step?. Hello everyone, I have a CS80 that recently developed ?a tuning problem with one voice. The repair shop that worked on it a few years ago thought it might be a calibration issue. I just got it back from the shop and the one voice is still not in tune when I first power up, but about 15 or 20 after the CS has warmed up, it stabilizes and is in tune. Since I never had this problem before I am thinking there is still something that needs to be fixed or replaced.?
Just wondering what insights any of you might have regarding this problem?
Thanks in advance for your help!
Best regards,
Alex
|
Tech recommendations in or around Los Angeles
Hi folks,
I’ll finally be moving my CS80 down the coast to my new home in LA in a couple of months, and I’ve been thinking of giving it a long overdue ‘spa treatment’—replacing decaying caps/CMOS chips and hopefully eliminating a few minor aftertouch gremlins in the process.
Does anyone know who the trustworthy/non-CS80phobic technicians are in this part of the world?
Thanks in advance. ?
|
As long as we’re talking just a few cents off in either direction, I always understood this was standard behaviour, and why it’s suggested that you let the synth warm up to a stable operating temp before tuning it—a rule that applied in ‘76 as much as it applies today. I’ve got the older tuning pots on mine and the tuning definitely drifts a bit as it warms up/cools down.?
Given all of the calamitous problems that can arise in a CS80 following a service, I’d say you’re in pretty good shape if this is the worst of them. ;)
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On Mar 17, 2022, at 11:09 AM, Alexander488 <alexander488@...> wrote:
? Hi Scott, I don’t know. I can ask the technician, he would likely know since he said he had to wait for it to warm up before he could calibrate that voice.? On Mar 17, 2022, at 1:04 PM, Scott Rodriguez <synthrodriguez@...> wrote:
? My expectation is that the chip has become defective. There's not much else that would do that and stabilize after 15 or 20 minutes as you describe.
How far out is it when it's cold before it warms up? A few cents? A half-step?. Hello everyone, I have a CS80 that recently developed ?a tuning problem with one voice. The repair shop that worked on it a few years ago thought it might be a calibration issue. I just got it back from the shop and the one voice is still not in tune when I first power up, but about 15 or 20 after the CS has warmed up, it stabilizes and is in tune. Since I never had this problem before I am thinking there is still something that needs to be fixed or replaced.?
Just wondering what insights any of you might have regarding this problem?
Thanks in advance for your help!
Best regards,
Alex
|
Do you think it ok to keep using the keyboard for the time being, or am I risking doing damage to other parts of the CS??
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On Mar 17, 2022, at 1:09 PM, Alexander488 <alexander488@...> wrote:
? Hi Scott, I don’t know. I can ask the technician, he would likely know since he said he had to wait for it to warm up before he could calibrate that voice.? On Mar 17, 2022, at 1:04 PM, Scott Rodriguez <synthrodriguez@...> wrote:
? My expectation is that the chip has become defective. There's not much else that would do that and stabilize after 15 or 20 minutes as you describe.
How far out is it when it's cold before it warms up? A few cents? A half-step?. Hello everyone, I have a CS80 that recently developed ?a tuning problem with one voice. The repair shop that worked on it a few years ago thought it might be a calibration issue. I just got it back from the shop and the one voice is still not in tune when I first power up, but about 15 or 20 after the CS has warmed up, it stabilizes and is in tune. Since I never had this problem before I am thinking there is still something that needs to be fixed or replaced.?
Just wondering what insights any of you might have regarding this problem?
Thanks in advance for your help!
Best regards,
Alex
|
Hi Scott, I don’t know. I can ask the technician, he would likely know since he said he had to wait for it to warm up before he could calibrate that voice.?
toggle quoted message
Show quoted text
On Mar 17, 2022, at 1:04 PM, Scott Rodriguez <synthrodriguez@...> wrote:
? My expectation is that the chip has become defective. There's not much else that would do that and stabilize after 15 or 20 minutes as you describe.
How far out is it when it's cold before it warms up? A few cents? A half-step?. Hello everyone, I have a CS80 that recently developed ?a tuning problem with one voice. The repair shop that worked on it a few years ago thought it might be a calibration issue. I just got it back from the shop and the one voice is still not in tune when I first power up, but about 15 or 20 after the CS has warmed up, it stabilizes and is in tune. Since I never had this problem before I am thinking there is still something that needs to be fixed or replaced.?
Just wondering what insights any of you might have regarding this problem?
Thanks in advance for your help!
Best regards,
Alex
|
My expectation is that the chip has become defective. There's not much else that would do that and stabilize after 15 or 20 minutes as you describe.
How far out is it when it's cold before it warms up? A few cents? A half-step?.
Hello everyone, I have a CS80 that recently developed ?a tuning problem with one voice. The repair shop that worked on it a few years ago thought it might be a calibration issue. I just got it back from the shop and the one voice is still not in tune when I first power up, but about 15 or 20 after the CS has warmed up, it stabilizes and is in tune. Since I never had this problem before I am thinking there is still something that needs to be fixed or replaced.?
Just wondering what insights any of you might have regarding this problem?
Thanks in advance for your help!
Best regards,
Alex
|
Hello everyone, I have a CS80 that recently developed ?a tuning problem with one voice. The repair shop that worked on it a few years ago thought it might be a calibration issue. I just got it back from the shop and the one voice is still not in tune when I first power up, but about 15 or 20 after the CS has warmed up, it stabilizes and is in tune. Since I never had this problem before I am thinking there is still something that needs to be fixed or replaced.?
Just wondering what insights any of you might have regarding this problem?
Thanks in advance for your help!
Best regards,
Alex
|
Mathias Tjonn
pyjamagroove
Michael Carr