CS50 Calibration
2017-10-20 by roby.mx@...
Hello, first all, thank you for approval of my membership in the group. I m a owner of a CS50, that I purchased recently. The synth need a complete
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CS-80: Output level down to nothing
2017-10-07 by joaopaulosilva12@...
Has anyone experienced this. The Cs80 output level from one day to the next went from normal to nothing. It started getting lower and lower and now I got no
Re: [yamahacs80] IG00150, ribbon controller and levers
2017-09-22 by Joao Silva
Thank you so much for the instructions. What I am worried is damaging the felt covering. How or what did you use to pull it up? It seems very well glued in
Re: [yamahacs80] Re: IG00150, ribbon controller and levers
2017-09-22 by David Rogoff
Here’s the instructions I used when I replaced one several years ago. Worked great. There is nothing very special you need to do the ribbon spring. First
Re: IG00150, ribbon controller and levers
2017-09-22 by joaopaulosilva12@...
Hi Marteen, I also need to replace the ribbon spring which I bought some time ago. Are there any videos out there showing the procedure? Thanks John
Re: [yamahacs80] IG00150, ribbon controller and levers
2017-09-21 by beschetnov@...
Hello Im need 2 springs what is your mail?
Re: [yamahacs80] IG00150, ribbon controller and levers
2017-09-21 by RL Music (L)
Hi Maarten, I have a small number of replacement Ribbon Springs available to buy so please email me directly for details: richard@rlmusic.co.uk Regards Richard
IG00150, ribbon controller and levers
2017-09-21 by maartenhalmans@...
Hello All, currently I am repairing a CS-80 which had a lot of problems, it was not powering up and several custom Yamaha chips where dead on serveral boards.
Re: Troubleshooting the Sub Oscillator Section
2017-09-20 by joaopaulosilva12@...
Does anyone have the Sub-Oscilator board replacement components LIST, in case I need to buy replacements and where you usually source them from. Thanks
Re: Sub Oscillator Problem
2017-09-19 by joaopaulosilva12@...
Hi. Do you still have any of those bulbs for sale? ... I can help you with the panel bulbs. It took me years to find replacements, so I made a group buy and
Re: Troubleshooting the Sub Oscillator Section
2017-09-16 by joaopaulosilva12@...
Thank you both Florian and Jonathan. I ll take your advice seriously.
Re: [yamahacs80] Troubleshooting the Sub Oscillator Section
2017-09-15 by Jonathan Dewdney
its quite true what Florian says ... it s really not something you can approach lightly ... at least not without understanding the interactions of components
Re: [yamahacs80] Troubleshooting the Sub Oscillator Section
2017-09-15 by Florian Anwander
Hello You need an oscilloscope and the ability to handle the scope and the ability to read schematics and pcb layouts. To be honest: As long as you are not an
Troubleshooting the Sub Oscillator Section
2017-09-15 by joaopaulosilva12@...
My Sub Oscillator section is not working at all. What s the best way to go about troubleshooting the different components for failures on the board? How do I
Re: [yamahacs80] IG00150 LFO chips?
2017-09-15 by joaopaulosilva12@...
Looking for an IG00150. Synthparts does not have any. My sub section not working.
Re: CS50 blowing uppermost fuse
2017-08-16 by jw_dewdney@...
could i be correct in guessing that the problem couldn t be a blown primary winding since the PS is blowing fuses ? i mean it shouldn t be able to bring
Re: CS50 blowing uppermost fuse
2017-08-16 by jw_dewdney@...
update: i haven t had much of a chance to look into this until recently- it s looking like there is an open circuit (no connection) between the BROWN and
IG00153 VCA
2017-07-31 by musicalfix@...
HI. I am needing a IG00153 VCO if anyone has any for sale?
Re: [yamahacs80] CS50 blowing uppermost fuse
2017-07-25 by jw_dewdney@...
Hi Florian - there are three fuses mounted on the front left of the power supply - and they are all mounted (stacked) in a group of three horizontally - so it
Re: [yamahacs80] CS50 blowing uppermost fuse
2017-07-23 by Florian Anwander
Which one do you mean with uppermost ?
Re: [yamahacs80] CS50 blowing uppermost fuse
2017-07-23 by Csaba Zvekan
Find out which voltage the fuse is protecting. Then desolder board for board all those voltages. Measure with the ohmmeter for short. Once a board shows 0 Ohm
CS50 blowing uppermost fuse
2017-07-23 by jw_dewdney@...
My CS50 started blowing fuses. A preliminary check revealed nothing obvious in the power supply - is there a recommended routine for this? Maybe first checking
Re: CS50 schematics anywhere??
2017-06-27 by jw_dewdney@...
well that too... though I was just referring to the quality of the scans... the CS50 documents I already had were pretty awful as far as reproduction goes
Re: CS50 schematics anywhere??
2017-06-27 by mr@...
Yamaha s old service documents are among the beautifullest technical prints ever. The schematics, the graphics, the typesetting, the yellowed paper, the
Re: CS50 schematics anywhere??
2017-06-26 by jw_dewdney@...
those are some of the nicest PDFs i ve seen in a long time from a vintage source (presumably) too...
Re: CS50 schematics anywhere??
2017-06-26 by jw_dewdney@...
thank you!! you re a real light saber! (life saver)
Re: [yamahacs80] CS50 schematics anywhere??
2017-06-26 by David Rogoff
Welcome to the group! All the service manuals / schematics are on my website here: http://therogoffs.com/cs80/
CS50 schematics anywhere??
2017-06-26 by jw_dewdney@...
Hi all... i m new to the group. I have a CS50 service manual i downloaded but can t seem to find any drawings in the package - it s only a long description of
My latest CS videos...
2017-04-25 by noddyspuncture@...
Here a couple of links to my latest CS videos... Cheerz, Tom https://www.youtube.com/watch?v=GN4JkD6VOBE https://www.youtube.com/watch?v=GN4JkD6VOBE
Re: [yamahacs80] Wah-Wah
2017-04-24 by noddyspuncture@...
Here is a video I made of the pedal I have come up with for controlling the Brilliance ... using a slider from an old Yamaha organ...! Cheers, Tom
Re: [yamahacs80] Wah-Wah
2017-04-24 by noddyspuncture@...
Thanks for the idea David, but it occurred to me that I might want to use the sub osc on one of it s waves while playing the synth and controlling the
Re: [yamahacs80] Wah-Wah
2017-04-24 by David Rogoff
If you’re going to do a +/-15v pedal, why not just plug it into the sub-osc external input jack, turn up the ext level knob next to the jack, and set the Sub
Re: Wah-Wah
2017-04-23 by noddyspuncture@...
Again, thanks - I ll have a good look at your diagram...but I was thinking along the lines of actually over-patching the brilliance control (wire from the
Re: Wah-Wah
2017-04-23 by joachim.milson@...
I thought about your project for a while and here is how I would do it, if I had to :
Re: Wah-Wah
2017-04-22 by noddyspuncture@...
Thanks for the info Joachim, By the way - your last line about another design, that is what I m planning on doing..! I think controlling Brilliance would add
Re: Wah-Wah
2017-04-20 by joachim.milson@...
Hi Tom, I just posted a redrawn diagram to get a better overview of the effects order. Since, for some reason, the resolution is reduced after the file
Re: [yamahacs80] Re: Wah-Wah
2017-04-20 by noddyspuncture@...
I can t help thinking that foot pedal control of the brilliance setting would be much more useful...!
Re: [yamahacs80] Re: Wah-Wah
2017-04-20 by Tommy Salsero
Another Question about the exp wha circuit: none of you have audio or video where you can hear this effect? On my cs 80, with the pedal at full volume (full
Re: [yamahacs80] Re: Wah-Wah
2017-04-20 by David Rogoff
yes. it s just and old wah-wah guitar pedal circuit. Sent from my iPhone
Re: Wah-Wah
2017-04-20 by noddyspuncture@...
Thanks David, What about PH3..?... would that be the actual wah photocell...? Cheers, Tom
Re: [yamahacs80] Wah-Wah
2017-04-20 by David Rogoff
Hi Tom! Quick note since I’m at work. I’m looking at the big, fold-out schematic at the PRA EXP WAH Circuit all the way at the top right. The foot pedal
Wah-Wah
2017-04-20 by noddyspuncture@...
Hi folks, Not been here for a long time... but I thought I d make a quick post. I ve been playing the 80 s a lot recently... and have gotten into altering the
All voice chips back in stock
2017-04-08 by synthparts@...
Hi, I now have all IGxxxx voice chips back in stock including the VCOs and VCFs. Doug synthparts.com
Re: [yamahacs80] One more thing...
2017-03-15 by Kyle Jarger
I m sorry I can t provide any further details about where the grounds join together or join back to the grounds from the PSU; I just don t remember. One
Re: [yamahacs80] One more thing...
2017-03-15 by LucidSound
I’m keen to know where the grounds should be linked. I’m seeing the M card ground is 0.3 ohm with respect to the logic power ground, but around 2k to the
One more thing...
2017-03-15 by Kyle Jarger
Hi Lucid Sound, I remember that in the case i mentioned, some of the voltages I measured would change unexpectedly when I played up and down the keyboard, thus
Re: [yamahacs80] CS80 Strange Behaviour
2017-03-15 by Kyle Jarger
I d check if all the intended ground connections are intact. I ve seen units where the +6.5/-8.5 (whatever it is LOL) volts, (or the other rail) become
CS80 Strange Behaviour
2017-03-14 by LucidSound
Today I had a CS80 in for a service. Basically most of the voices were working, but a couple were dead and there was the usual problem with unequal volume and
CS80 schematic project
2017-03-05 by David Rogoff
Hi all. As many of you know who’ve repaired CS-80s (and related), the Yamaha schematics and board layouts are full of errors. In addition, in my work in
New file uploaded to yamahacs80
2017-03-05 by yamahacs80@yahoogroups.com
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the yamahacs80 group. File : /EDA