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: an "almost" unwanted portamento

 

Hi Florian, thank you for your suggestion!
I investigate the S&H and if I find nothing I go and see.
Re: CS-80: an "almost" unwanted portamento

 

Portamento or Glissando switch doesn't change the result. But?look below (we are on the S&H board outputs). One is terminal K3 and the other is K4, the one with the problem .. guess which one is!). I apologize for the quality of the signal detection, but I think it can be seen quite clearly.. I then checked the outputs 3 and 4 of the KAS board and they seem ok. So I hope the problem is right on the S&H. I am going to check that this is the case, I keep you updated hoping that it can also be useful to someone else.
Re: CS-80: an "almost" unwanted portamento

 

开云体育

My suspect is the 4016 (IC10 on KAS)


Am 16.09.22 um 08:35 schrieb Joachim Milson:

Hi Bof bof,

That's strange indeed.
If you set the Portamento-Glissando rocker switch to Glissando while keeping the Portamento-Glissando white slider to short, do you get stepwise variations or is it still smooth?
To help locating the source of the problem, you could try and probe at K4 (just behind the buffer) on the KAS board while playing. If the pitch signal there varies in time, the problem would most certainly be on the KAS.

Joachim

Re: CS-80: an "almost" unwanted portamento

 

Hi Bof bof,

That's strange indeed.
If you set the Portamento-Glissando rocker switch to Glissando while keeping the Portamento-Glissando white slider to short, do you get stepwise variations or is it still smooth?
To help locating the source of the problem, you could try and probe at K4 (just behind the buffer) on the KAS board while playing. If the pitch signal there varies in time, the problem would most certainly be on the KAS.

Joachim
Re: CS-80: an "almost" unwanted portamento

 

On Thu, Sep 15, 2022 at 07:52 AM, Joachim Milson wrote:
Hi,
Do you get both upwards and downwards portamento?
Also can you confirm that the Portamento-Glissando white slider is set all the way down to Short (which is what turns the Portamento-Glissando effects off in the YM26700).
Joachim
Hi Joachim,
thanks for your answer.
Yes, the Portamento/Glissando is off (all the way down),?also because I believe that if this were not the case the behavior would be on all voices and not only on the voice 4. I also confirm that this strange behavior occurs upwards and downwards (and only when I change note -therefore voltage- but not if I stay on the same note).
Re: CS-80: an "almost" unwanted portamento

 

Hi,
Do you get both upwards and downwards portamento?
Also can you confirm that the Portamento-Glissando white slider is set all the way down to Short (which is what turns the Portamento-Glissando effects off in the YM26700).
Joachim
CS-80: an "almost" unwanted portamento

 

Hi everyone, I hope you are all well.
I have strange behavior on my CS-80. On the fourth voice (therefore cascading on both M14 and M24 cards) there is a portamento that occurs as soon as I press the key .. if I stay on that key and continue to play (therefore switching on the other voices) when I pass through the fourth voice nothing happens and the behavior is normal .. if instead I change the note as soon as I return to the fourth voice (so on M14-M24) here is the portamento! I state that the portamento is disabled, on the CS-80 all the old CMOS, OP-AMPs, ELECTROLYTIC CAPACITORS and TANTALUM have been changed. The problem, given the behavior, I would say that it is before of the two M cards. I checked the values on the KAS, on the S / H and in doubt also on TRG4 boards (I wanted to remove the doubt that it wasn't an initial-pitchbend problem, but in this case it should have always been portamento on the fourth voice, right?). The values on these boards are the reference values for the calibration .. Where could I inquire? Could it be a problem with some RC network?
Thanks anyway for your time!
Re: Replacing bulb on Yamaha CS-80 expression pedal?

 

Thank you very much to you both (Gustavo and Scott), this is very helpful. This should bring back my CS80 to fully working condition.


Martin
Re: Replacing bulb on Yamaha CS-80 expression pedal?

 

Martin:

For PH1, PH2, and PH3 on the PRA board, the Xvive Vactrol VTL5C3 is a drop-in replacement.

Its response curve?is the same as original working parts on the PRA card according to my tests and I have used?them on several occasions to restore function to CS-80's without issues. I keep them in the parts bins for the occasion when a customer's machine shows up with a dead?one.

Scott Rodriguez


On Sun, Sep 4, 2022 at 7:45 PM Gustavo E.E. Grinovero <geegrinovero@...> wrote:

Hi Martin, how told that was Mr. Scott Rodriguez, I only agreed with his comment.

Anyway let me tell you that if the Diode that illuminates the photo resistor in PH1, PH2 or PH3 opens up, that is going to make that you do not get sound from the CS. This is because of the topology of the circuit (devices are in a serie).

Regarding a replacement, since I didn't have problems with them, I do not know. But I can give you some ideas.

On one hand you can try to look for an integrated device (how I suppose that PH1, PH2 and PH3 are). The main characteristic must be the resistance of the photo resistor with the lower and higher light..... I have seen in t he past.... long, long time ago, that sometime these devices are custom made. On one hand you have the photocell and lamp and a tube keeping the lamp facing the photocell, usually kept all together by mean of termocontraible tube. Photocells of a given size have likely response (this is not absolutely true, but we can approach the point this way). Replacing the old lamp with a LED is something that deserve a analysis and trial-error procedure.... They do not have for sure a likely response regarding Voltage applied versus lighting power. Anyway there is something to keep in mind, to avoid problems of a misbehavior, replace all the PHx at once. Depending of the lighting device chosen, you surely will have to make an adjustment to the variable voltage that feeds the lamps.
Hope these thoughts can help.
Have a nice day/night!
Gustavo.


On 9/4/2022 7:05 PM, Mooseheads wrote:

Greetings to all,

?

Since the topic is including problems on the PRA board (which mine has) I thought I would ask.? Gustavo when you write:

?

“If one or both of the sensors in the CS-80 are dead, replacements are available. I'm not familiar with the…”

?

Are you by any change referring to PH1, PH2 and PH3 on the PRA board?? I have been looking for a replacement part for some time.? Would you mind letting me know what that replacement part is?? This is the last issue I am aware off in my machine, I would very much like to rectify the problem!

?

?

Thank you very much

?

?

Martin
Re: Replacing bulb on Yamaha CS-80 expression pedal?

 

开云体育

Hi Martin, how told that was Mr. Scott Rodriguez, I only agreed with his comment.

Anyway let me tell you that if the Diode that illuminates the photo resistor in PH1, PH2 or PH3 opens up, that is going to make that you do not get sound from the CS. This is because of the topology of the circuit (devices are in a serie).

Regarding a replacement, since I didn't have problems with them, I do not know. But I can give you some ideas.

On one hand you can try to look for an integrated device (how I suppose that PH1, PH2 and PH3 are). The main characteristic must be the resistance of the photo resistor with the lower and higher light..... I have seen in t he past.... long, long time ago, that sometime these devices are custom made. On one hand you have the photocell and lamp and a tube keeping the lamp facing the photocell, usually kept all together by mean of termocontraible tube. Photocells of a given size have likely response (this is not absolutely true, but we can approach the point this way). Replacing the old lamp with a LED is something that deserve a analysis and trial-error procedure.... They do not have for sure a likely response regarding Voltage applied versus lighting power. Anyway there is something to keep in mind, to avoid problems of a misbehavior, replace all the PHx at once. Depending of the lighting device chosen, you surely will have to make an adjustment to the variable voltage that feeds the lamps.
Hope these thoughts can help.
Have a nice day/night!
Gustavo.


On 9/4/2022 7:05 PM, Mooseheads wrote:

Greetings to all,

?

Since the topic is including problems on the PRA board (which mine has) I thought I would ask.? Gustavo when you write:

?

“If one or both of the sensors in the CS-80 are dead, replacements are available. I'm not familiar with the…”

?

Are you by any change referring to PH1, PH2 and PH3 on the PRA board?? I have been looking for a replacement part for some time.? Would you mind letting me know what that replacement part is?? This is the last issue I am aware off in my machine, I would very much like to rectify the problem!

?

?

Thank you very much

?

?

Martin
Re: Replacing bulb on Yamaha CS-80 expression pedal?

 

开云体育

Greetings to all,

?

Since the topic is including problems on the PRA board (which mine has) I thought I would ask.? Gustavo when you write:

?

“If one or both of the sensors in the CS-80 are dead, replacements are available. I'm not familiar with the…”

?

Are you by any change referring to PH1, PH2 and PH3 on the PRA board?? I have been looking for a replacement part for some time.? Would you mind letting me know what that replacement part is?? This is the last issue I am aware off in my machine, I would very much like to rectify the problem!

?

?

Thank you very much

?

?

Martin
Re: Replacing bulb on Yamaha CS-80 expression pedal?

 

开云体育

Hi,

Could anyone provide the correct style/base number for the?24v 5w bulb in this expression pedal? It seems like most of the 24V 5W are huge. Many indicator lamps have a standard four digit number like #1819 etc. or a letter and number code in the EU.

And is it the same as is used in the touch sensor strip in a CS-50?

I already accidentally bought a box of huge ones :(

Thanks,

DT
Re: Replacing bulb on Yamaha CS-80 expression pedal?

 

Gustavo.:?I was trying to assist??Mathias with his debugging efforts. And right you are, the preamp card is called out as PRA, not PRE, my mistake.


On Sun, Sep 4, 2022 at 7:46 AM Gustavo E.E. Grinovero <geegrinovero@...> wrote:

Hello Scott, I do not know if you are adressing to Mathias or me....

Just in case it is me, I have the original Foot Controller with Lamp/Photoresistor. and the board that you referenced it is PRA board and what you say it is correct. That board basically let you control 2 signals (Stereo output) with a single control (Foot Controller).

Have a nice day!,

Gustavo.

On 9/4/2022 8:27 AM, Scott Rodriguez wrote:
Do you have a Yamaha FC7 expression pedal you could use to check out the circuit? They work ok with the CS-80, but the range is a bit biased compared to the original light-operated unit. That will at least tell you if the sensor in the pedal is dead, or if the sensors in the CS-80 are dead.

Also be aware there are two independent sensor circuits on the CS-80 PRE card, one for the Left output and one for the Right output. So, try the Left and Right output jacks independently using a known-good pedal (like an FC-7).to determine if the sensors in the CS-80 are bad.? Be advised the sensors can "sort of" work and pass just a little bit of?signal. You may be able to hear just a little bit of output from one side and none or a little more from the other. They can pass all of the signal,?none of it, or anywhere in between.

If one or both of the sensors in the CS-80 are dead, replacements are available. I'm not familiar with the pedal sensor as I've never had one to work on. I expect a properly spec'ed?replacement would be available for it as well. It's probably the same as a CS-50/60 aftertouch sensor, but that's just a guess.

On Sat, Sep 3, 2022 at 8:44 PM Gustavo E.E. Grinovero <geegrinovero@...> wrote:

Hello Mathias, in a couple of weeks I will be at the place where it is stored my CS-80.

Then I will be able to take note of the Foot Controller circuit and pass you some information to verify yours.

Hold on.

Have a nice weekend!,

Gustavo.


On 9/3/2022 6:08 AM, Mathias Tjonn wrote:

Hi Gustavo,

?

Thank you for the information! I did open up the pedal and good news: the bulb is working when plugged in and gives off light.

I don't know how to test the photo-resistor, however. Any help appreciated!

...or if the fact that the pedal is not working, means there is something wrong with the CS-80?

?

Any further thoughts much appreciated. Best, Mathias
Re: Replacing bulb on Yamaha CS-80 expression pedal?

 

开云体育

Hello Scott, I do not know if you are adressing to Mathias or me....

Just in case it is me, I have the original Foot Controller with Lamp/Photoresistor. and the board that you referenced it is PRA board and what you say it is correct. That board basically let you control 2 signals (Stereo output) with a single control (Foot Controller).

Have a nice day!,

Gustavo.

On 9/4/2022 8:27 AM, Scott Rodriguez wrote:

Do you have a Yamaha FC7 expression pedal you could use to check out the circuit? They work ok with the CS-80, but the range is a bit biased compared to the original light-operated unit. That will at least tell you if the sensor in the pedal is dead, or if the sensors in the CS-80 are dead.

Also be aware there are two independent sensor circuits on the CS-80 PRE card, one for the Left output and one for the Right output. So, try the Left and Right output jacks independently using a known-good pedal (like an FC-7).to determine if the sensors in the CS-80 are bad.? Be advised the sensors can "sort of" work and pass just a little bit of?signal. You may be able to hear just a little bit of output from one side and none or a little more from the other. They can pass all of the signal,?none of it, or anywhere in between.

If one or both of the sensors in the CS-80 are dead, replacements are available. I'm not familiar with the pedal sensor as I've never had one to work on. I expect a properly spec'ed?replacement would be available for it as well. It's probably the same as a CS-50/60 aftertouch sensor, but that's just a guess.

On Sat, Sep 3, 2022 at 8:44 PM Gustavo E.E. Grinovero <geegrinovero@...> wrote:

Hello Mathias, in a couple of weeks I will be at the place where it is stored my CS-80.

Then I will be able to take note of the Foot Controller circuit and pass you some information to verify yours.

Hold on.

Have a nice weekend!,

Gustavo.


On 9/3/2022 6:08 AM, Mathias Tjonn wrote:

Hi Gustavo,

?

Thank you for the information! I did open up the pedal and good news: the bulb is working when plugged in and gives off light.

I don't know how to test the photo-resistor, however. Any help appreciated!

...or if the fact that the pedal is not working, means there is something wrong with the CS-80?

?

Any further thoughts much appreciated. Best, Mathias
Re: Replacing bulb on Yamaha CS-80 expression pedal?

 

Do you have a Yamaha FC7 expression pedal you could use to check out the circuit? They work ok with the CS-80, but the range is a bit biased compared to the original light-operated unit. That will at least tell you if the sensor in the pedal is dead, or if the sensors in the CS-80 are dead.

Also be aware there are two independent sensor circuits on the CS-80 PRE card, one for the Left output and one for the Right output. So, try the Left and Right output jacks independently using a known-good pedal (like an FC-7).to determine if the sensors in the CS-80 are bad.? Be advised the sensors can "sort of" work and pass just a little bit of?signal. You may be able to hear just a little bit of output from one side and none or a little more from the other. They can pass all of the signal,?none of it, or anywhere in between.

If one or both of the sensors in the CS-80 are dead, replacements are available. I'm not familiar with the pedal sensor as I've never had one to work on. I expect a properly spec'ed?replacement would be available for it as well. It's probably the same as a CS-50/60 aftertouch sensor, but that's just a guess.

On Sat, Sep 3, 2022 at 8:44 PM Gustavo E.E. Grinovero <geegrinovero@...> wrote:

Hello Mathias, in a couple of weeks I will be at the place where it is stored my CS-80.

Then I will be able to take note of the Foot Controller circuit and pass you some information to verify yours.

Hold on.

Have a nice weekend!,

Gustavo.


On 9/3/2022 6:08 AM, Mathias Tjonn wrote:

Hi Gustavo,

?

Thank you for the information! I did open up the pedal and good news: the bulb is working when plugged in and gives off light.

I don't know how to test the photo-resistor, however. Any help appreciated!

...or if the fact that the pedal is not working, means there is something wrong with the CS-80?

?

Any further thoughts much appreciated. Best, Mathias
Re: Replacing bulb on Yamaha CS-80 expression pedal?

 

开云体育

Hello Mathias, in a couple of weeks I will be at the place where it is stored my CS-80.

Then I will be able to take note of the Foot Controller circuit and pass you some information to verify yours.

Hold on.

Have a nice weekend!,

Gustavo.


On 9/3/2022 6:08 AM, Mathias Tjonn wrote:

Hi Gustavo,

?

Thank you for the information! I did open up the pedal and good news: the bulb is working when plugged in and gives off light.

I don't know how to test the photo-resistor, however. Any help appreciated!

...or if the fact that the pedal is not working, means there is something wrong with the CS-80?

?

Any further thoughts much appreciated. Best, Mathias
Re: Replacing bulb on Yamaha CS-80 expression pedal?

 

Hi Gustavo,

?

Thank you for the information! I did open up the pedal and good news: the bulb is working when plugged in and gives off light.

I don't know how to test the photo-resistor, however. Any help appreciated!

...or if the fact that the pedal is not working, means there is something wrong with the CS-80?

?

Any further thoughts much appreciated. Best, Mathias
Re: GX1 / CS80 video

 

Thanks David, this was amazing!

?

Best, Mathias
GX1 / CS80 video

 

Hi all!

I ran across this Led Zeppelin video last night about In Through The Out Door. It has a surprising amount about the wonderful Dream Machine including the ELP and Abba connections. This link should jump right to where they start talking about it. Enjoy!



David
Re: Replacing bulb on Yamaha CS-80 expression pedal?

Stan Valiulis
 

开云体育

No problem Some else wants it.? It will be good see ?it get used.? Best of luck solving your problem.?

?

From: [email protected] <[email protected]> on behalf of Mathias Tjonn <mathiastjoenn@...>
Date: Thursday, August 18, 2022 at 6:36 PM
To: [email protected] <[email protected]>
Subject: Re: [yamahaCS80fans] 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

61 - 80 of 4946