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Replacing bulb on Yamaha CS-80 expression pedal?
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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? |
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Stan Valiulis
开云体育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 ? From:
yamahaCS80fans@groups.io <yamahaCS80fans@groups.io> on behalf of Mathias Tjonn <mathiastjoenn@...> 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? |
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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 |
开云体育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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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:
yamahaCS80fans@groups.io <yamahaCS80fans@groups.io> on behalf of Mathias Tjonn <mathiastjoenn@...> Hi Stan, |
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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. ? Any further thoughts much appreciated. Best, Mathias |
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:
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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:
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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:
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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:
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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 |
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 |
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:
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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:
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Mathias Tjonn