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2013-05-24 by T.M. Bois
Thanks, Laurie--that makes sense, and describes my synth s behaviour perfectly. One less thing to worry about! ;) And sorry pyjamagroove--sounds like the
2013-05-24 by Laurie Curry
Just to demonstrate an example of this common issue you are experiencing with the kyb control playing in and out of ranges with sustain I engaged....
2013-05-24 by Laurie Curry
that is how the CS80 works....there are both sustain modes.... I and II.... pitch and filter are disabled in Sus 1 on releasing notes... in Sus ii , filter
2013-05-23 by Quazimodo
Many many thanks Joachim - and of course Bob. All advice gratefully accepted and welcomed...;c) I shall report back once get on it..! Cheers, TOM
2013-05-23 by The Old Crow
CS filters cannot self-oscillate; they are wired with external feedback limiting on the resonance control VCAs inside the IG00156s. You might be hearing chorus
2013-05-23 by T.M. Bois
For what it s worth, the Keyboard Control Brilliance and Level both occasionally cause wonky things to happen on mine--especially on patches with long sustain
2013-05-23 by pyjamagroove
If I go to the panel mode (both channels) and turn all VCOS, noise and sine off, both VCF up -then I put overall brilliance and keyboard control brilliance up
2013-05-23 by Kent spong
Cut the carbon track and carefully place an 82k resistor in it s place. Do this as long as you are reading anything from about 13-14.98 volts from the wire
2013-05-23 by joachim.milson
Here is the fixed diagram of the transposition gate : M board Feet
2013-05-22 by joachim.milson
Hi Tom, Concerning your issue, I have the same feeling as Bob. But I can t help adding that a broken wire EK (a version of the ground dedicated to the pitch -
2013-05-22 by pyjamagroove
Wow, this group is amazing! So many responses in such a short time - Thanks a lot guys! I ll try to test it following your advices.
2013-05-22 by The Old Crow
... Educated guess here is the analog switch to select the ramp waveform has failed. It is called FET6 on the M board. The vintage part number is 2SK30,
2013-05-22 by Robert Stewart
It could be down to a variety of things. My first thing to try would be to check that VR1 is giving 0V at CP6. Is the problem the same regardless of which
2013-05-22 by Quazimodo
No there is a fault. The voice will not tune into range.. it is very low compared to the others as is the voltage on CP6. The effect I get is when I check the
2013-05-22 by Laurie Curry
I know if you dont use insulated screwdrivers when tuning, the pitch will sharpen slightly...and then flatten as you pull away... i assume thats the effect you
2013-05-22 by Laurie Curry
always remember to power off the CS80 and lay a cloth or towel down on the keybed frame before attempting to remove a M card from the rack rails... those
2013-05-22 by Laurie Curry
my guess is at or after the saw output on the waveshaper chip.. if you have square working, that out on the waveshaper is working..meaning the inverse saw
2013-05-22 by Quazimodo
Hi guys, I see there s some activity lately here so I thought I d try again. I posted this before but there were no replies... I have an out-of-tune M card.
2013-05-21 by joachim.milson
If you re lucky, both issues can be explained by two loose/broken wires. No sawtooth: look at input G2(44) of the M board on the overall circuit diagram. This
2013-05-21 by synthparts
Yes it does sound like it is a bad IG00158 waveshaper chip. I have them if you need one. Doug synthparts.com
2013-05-21 by Bob Stewart
Sounds like you have a faulty waveshaper on channel one. I don t have the service info in front of me so can t guide you through it. If you re confident
2013-05-21 by pyjamagroove
Hello, This is my first post here so - Hello everybody! My name is Tobias and last weekend I fulfilled my long time dream of getting (and actually playing for
2013-05-19 by Robert Stewart
Hi Joachim Yes the reality is slightly different, but it s effectively the same thing. A resistor to compensate is probably the way forward. I m just getting
2013-05-19 by Laurie Curry
I have 2 FC7 pedals (none of which I have tried on my CS80)... the original pedal uses a lightbulb and photocell with a teardrop hole shaped shutter between
2013-05-19 by joachim.milson
... and the two sides of the board are no longer connected. This PCB is printed on one side only. Its lower side is in direct contact with the metal plate on
2013-05-19 by Robert Stewart
OK. Just been looking at the pic, and the service manual. It could well be that the resistive print in that area is faulty either due to wear and tear, or just
2013-05-19 by Robert Stewart
Hmmm Odd. The other thing that I d be inclined to check is that any through hole connections on the board are all in tact. Occasionally I ve come across PTH
2013-05-19 by joachim.milson
Thanks Bob for your answer. I already cleaned the boards and sensors carefully. The contacts are very clean. I did it very carefully under a magnifying lens.
2013-05-19 by joachim.milson
Hi All, Whether the FC7 pedal control is compatible with the CS80 is not completely clear from what can be read here and there on the web. I had a shocking
2013-05-19 by Robert Stewart
Hi Joachim Sounds like there s some voltage leaking into areas you don t want it. First thing I d try is giving the board a good clean with some isopropyl
2013-05-19 by joachim.milson
Hi All, I acquired my CS80 (unit 1670) less than a month ago. It has a couple of known issues all bound to the keys. The one that could be fixed: - a sequence
2013-05-15 by David Rogoff
... There s a bunch of threads about this (search messages) and I replaced a broken spring with one of Kent s a few years ago. As I wrote, it was a bit tricky
2013-05-15 by David Rogoff
... Very cool - thanks!
2013-05-14 by Bob Stewart
Cool. Will let you know if we need it. B ... [Non-text portions of this message have been removed]
2013-05-14 by synthparts
I have a complete working ribbon I would sell for $250 + shipping. Doug synthparts.com
2013-05-12 by scituate_mass
I purchased one from Kent about four or five years ago when they were around 100 bucks each. So, he already got my business :) It seemed to be of good quality,
2013-05-11 by Nigel99
Thanks for the word of caution, obviously I would rather source a complete replacement ribbon but failing that replacing the spring with as close to original
2013-05-11 by Quazimodo
I don t think it s as easy as that. From what I ve heard the hard part is taking the unit apart without breaking it..! Have a go yourself, by all means but
2013-05-11 by colinfraser_com
PDF any use ? http://www.owner-manuals.com/EX1-service-manual-YAMAHA.html Cheers, Colin f
2013-05-11 by Nigel99
I m still trying to ascertain if my ribbon is going to come good , it s semi-functioning state being my reason to look into this. I certainly wouldn t intend
2013-05-11 by scituate_mass
Hi Nigel, Please share the price with us when you get it. Maybe we could do a group buy and get a much better deal than the RL price. best, DT
2013-05-11 by Bob Stewart
Hi Nigel/Scott Good to know. Thanks. I tend to use Ebay, Synthparts, and Vintage Planet for most of my synth parts (I repair all kinds of synths, not just
2013-05-11 by npselliott
It s been said before, but replacement springs are available from UK RLMusic. I ve arranged to buy one, it s $285 US. Kinda pricey but have not found a
2013-05-10 by Mitchell Manger
Hi, I want to buy a Yamaha EX-1 Service Guide (not a user manual). Would anyone have either of these items available for sale or know where they might be
2013-05-10 by Nigel99
Hi Bob, If you come across more than one ribbon and are willing to share your source it would be much appreciated as I am looking for one. I made an enquiry
2013-05-10 by Nigel99
Just an update: I changed the EG chip and that did not solve the problem. Next I swapped the VCA and the voice disappeared altogether so I swapped back the
2013-05-10 by Bob Stewart
Hi Doug. Thanks. Don t think I ll be needing any M cards, but I should be placing an order for various chips for CS series soon. Also... Don t suppose you have
2013-05-10 by synthparts
Hi, I have a few complete, tested, and working M voice cards available for $400 + shipping. Thanks, Doug synthparts.com
2013-05-06 by David Rogoff
... Hi Nigel - welcome to the group. Good news it s working now. I didn t have a chance to look into this before you fixed it. FYI to any other group members
2013-05-06 by Nigel99
Just an update: I changed the EG chip and that did not solve the problem. Next I swapped the VCA and the voice disappeared altogether so I swapped back the