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I have formed a CAD designed board to accomplish offering a sync mod for the CS's... yes, all 3 of the 50,60 &80. It's listed on e-bay, but thanks to millions in recent medical bills and more surgeries for my wife, I can't pop the dough for the qty needed. I am able to provide working protos, but that's not logical as it takes hrs to hard wire it all up. If any of you haven't seen this, here's the e-bay link: Yamaha CS80 CS-80 synth mod. Unison, poly 2 & CS60,50 analog ! Have a listen ! Yamaha CS80 CS-80 synth mod. Unison, poly 2 & CS6... US $199.00 New other (see details) in Musical Instruments & Gear, Pro Audio Equipment, Synthesizers View on www.ebay.com Preview by Yahoo Hopefully, there's enough of you who appreciate the accessibility of this mod, cause until now, they cost a ton from Kent, plus you have to send your baby off to get it done. Hope you folks want some of these, I wiull only need about 10 days to stuff and ship the finished boards !

Hi all, I have finally managed to talk my tech into having a go at my CS 50 -- any things that require particular attention or that should be looked at? My 50 has the habit of occasionally producing portamento on some notes even though no portamento has been dialled in. Sometimes (very rarely) notes with a long release have a tendency to drift upwards in pitch -- I seem to remember that this is due to some caps gone bad on the KAS board, is that true? What CMOS components should be replaced as well? Any inspiration is welcome. Thanks, Stephen.

Hi folks, Long time no posting on here... but I thought I'd return to ask a question and also share an idea.... I have recently revisited a duff voice card in one of my CS80's... it was low in pitch and wouldn't pull in via the tuning calibration procedure. After fault finding around the transposition gate area and finding nothing, I bit the bullet and replaced the Osc chip. That cured it... i was really hoping it wasn't that, I even lifted the Osc chip out and was still getting the same fault condition voltages on CP6 as with it in. But go figure eh...? So, on this particular CS80 this is my 4th Osc chip that has needed replacing...! My other CS80 has never had an Osc chip go... so my question is, are they any others out there who need to - quite regularly - replace a faulty Osc chip...? Or am I just really, really, unlucky...?!? I am going to attempt a full calibration on this machine sometime soon... which leads me to the old problem of sliding the cards in and out..! Catching those thin wires on the back of the print on the card to it's left... or pulling on the thin wires on the card to it's right with it's own soldered side...! So I came up with a solution which I'd like to share. It really aids in removing and also replacing the cards without any "catching" whatsoever. I had an old plastic water container lying around and I looked at it and it suddenly struck me... so I cut out the sides. It was one like this... you end up with a smooth, thin, tough plastic sheet. http://ecx.images-amazon.com/images/I/21AYN0znB9L.jpg http://ecx.images-amazon.com/images/I/21AYN0znB9L.jpg View on ecx.images-amazon... Preview by Yahoo Cut them, height wise, to just fit between the "rails" and make them deep enough so that they reach right to the back but also protrude a little past the front of the boards. After loosening the two card screws you can easily slide them in either side of the card you want to remove... and the card will just slide out in between them - with no 'catching'...! Replacing the card is just as easy - make sure both sheets are up against the cards on either side and then just part them and slide your card back in. Pull out the sheets and you're done...! Hope this makes life a little more easy for you when you're servicing. Cheers, Tom

Hi, i got an CS60 in wonderful condition 2 weeks ago, of course im very very happy! :) But i found a problem, one of the voicecards (the 7th) doesnt respond to the sub-osc board. the card itself is working, sound is ok (osc ok). any idea where to start the research? Thank you! best regards michael

Anyone have more info on this? First I’ve heard of it. David

I know! And not once, but in other reface videos/livestreams Nate Tschetter keeps saying "C.S." stood for "control synth" : ( I hope he is told "Combo" is the proper term here before NAMM gets underway tomorrow...Hopefully someone there will help him see the light. If not, I may have to go there myself and straighten him out! Now, I need my CS-80 repaired...any reputable techs near the Houston-Dallas-St. Louis-Chicago range of Longitudes? I'm willing to drive it to any of these places or points in-between. Sincerely, Tommy Priakos

Hello everyone! Good to see a bit of traffic here lately after a long lull. I know why I've been so distracted and I assume most folks have lots of stuff going on in their lives. I'm finally getting back to a long-term CS80 renovation / mod project after moving and job changes and other fun stuff. I have a question for any of the techie types here. For review, all the digital logic in the beasts use standard (and mostly still available) CMOS chips. These are old DIP packages that only fit a hand full of gates in each chip. They are all run off of +8.5v and -6.5v. This weird arrangement fits in the 15-volt supply that the chips can handle and being offset allows analog switch chips (e.g. 4051, 4016) to process the analog control voltages and audio signals that are bi-polar around zero volts. So, I want to add a bunch of new logic including an FPGA (tons of re-programmable gates) and a processor (maybe Arduino). Mojo V3 - FPGA Development Board Mojo V3 - FPGA Development Board The Mojo is an FPGA development board with an Arduino compatible microcontroller on board. It is designed to be easy to use and a great introduction... View on embeddedmicro.com Preview by Yahoo Again, the catch is that this board has 3.3volt digital I/O - which is actually pretty high compared to the latest chips! So, I need to translate a lot of signals. The old standbys were the 1488 and 1489 chips that were design to translate from 5volt TTL to +/- 12v (or lower) for RS-232 serial ports. I might be able to use these but they would take up a ton of room and I'm not sure if they'll work with 3.3volt instead of 5volt. I looked around a bit yesterday but found tons and tons of possible chips and was hoping someone here might know a good chip to use. I'd like something that's 3.3volt on one side and up to the +8.5v/-6.5v Yamaha levels on the other side. DIP or SOIC package would be fine and I'd like 8 or more channels in each chip with versions for one-way and bi-directional. Any ideas on this idea in general? On the Mojo board? On the level-shifters? Thanks and hope everyone is having a happy, music-filled summer! David

Hi all, I've been browsing the archives to no avail. I would like to have my tech go through my 50 and have some minor issues fixed, like unsollicited portamento on some voices, pitch occasionally drifting upwards with long release etc. I seem to remember this has something to do with some of the caps on the voice assigner board going bad and perhaps with replacing the 4XXX CMOS component parts. Any pointers as to what to replace in what sequence? Also, I would like to have him calibrate internal levels. Any caveats? Thanks, Stephen (much to my amazement, my most recent message actually made it to the list... wow!).

All, After many years of lurking I'm making my first post... With all the seasons that life brings my grand plans to restore a CS60 (no legs or lid) came to nought and I have to dispose of it due to moving to a smaller house. The unit has been in storage since the late 90's and when stored worked and stayed remarkably in tune.. there was some mechanical damage to the preset switch bank so that some of them didn't lock and the front panel had minor cosmetic damage...couple of fader caps missing too. I'm near Oxford UK and would prefer to pass the project on to someone who will complete it.....or I will sell the cards etc to anyone who could use them. Along the way I acquired a few "spares" from a D80 and have Mini Keyboard Key assigner VCO, VCF, VCA and envelope boards If you would like any more info please contact me via the board (please copy tim.cockramATieee.org) as my yahoo group login details were tagged to a previous employers email address and only get parts of conversations forwarded. Cheers Tim

Hello CS80 users, Probably as most CS80 owners, i am aware that the most critical parts in the beast are the 2 main LSI's (YM26600&Ym26700), as their failure could quickly become problematic, since they are Yamaha proprietary and for this reason, hard to find/replace.And because they are the brain of the system, i guess it's important to rely on them in first place, before doing any other work/check further in the synth. That's why i decided to check mine, and for this purpose i focused on the values that i should expect on their respective 40pins.For this i collected infos from the CS Series servicing guide, CS80 service manual, and CS80 tuning&adjustment procedure, but unfortunately without concluding to a definitive and complete list of 'proper values'.Of course i also completed that list with some tangible results collected from my own CS80, but i prefered to leave a question mark in those places where my own CS80 results seemed hazardous. Maybe some of you could advice me in the process? My intend is to create ultimately a visual map of the LSI's of the most important boards, starting with the KAS for now.The idea is to share all results in this forum for everybody's convenience, so any help is welcome! So, this is what i could find (question marks stand for unknown values, and in parenthesis are my own CS80 values, filling missing infos from the manuals): 1) LSI YM26600: -VSS (Pin#1)= +8.5v -Master Clock (Pin#2)= 94Khz (~5khz) -SC (Pin#3)= 1/9 of 94Khz= 10.8Khz -SC8 (Pin#4)= 1/8 of 10.4Khz= 1.35 Khz -IC (Pin#5)= ? -VDD (Pin#6)= -6.5v -Note terminals (Pin#7-19)= ? -U1-U5 (Pin #20-25) = ? -N1-N4 (Pin #25-28) = ? -B1-B3 (Pin #29-31)= ? -K01-K08 (Pin #32-39)= +8.5v/-6.5v (Note off/Note on) -MODE (Pin #40)= -6.5v/+8.5v (8 sounds/7 sounds) 2) LSI YM26700: -VSS (Pin#1)= +8.5v -SC8 (Pin#2)= 1.35 Khz (=Pin#4 YM26600) -PORT (Pin#3)= -6.5v/+8.5v (PN3-VR2 short/long) -PC (Pin#4)= ? -N1-N4 (Pin#5-8)= ? -B1-B3 (Pin#9-11)= ? -Pin#12= 10.4Khz [-Pin#13=125mv -Pin#14= 250mv -Pin#15= 500mv -Pin#16= 1v -Pin#17= 2v -Pin#18= 4V -Pin#19-30 (C0/C5)=190mv/1.97v-202mv/2.1v-214mv/2.22v-227mv/2.35v-240mv/2.49v-255m/2.64v-270mv/2.80v-286mv/2.97v-303mv/3.14v-321mv/3.33v-340mv/3.53v-361mv/3.75v] -Pin#31-38= ? -pin#39= -6.5v -Pin#40= 94Khz Thank you for your help!

Hi all! Can somebody tell me how the pitch ribbon works on the CS-80? I mean does it output variable resistance or how is it made. I would like to use one for a CS-80 related project. There are new ribbons like this: https://www.sparkfun.com/products/8681 They are variable potentiometers, is the ribbon for the CS-80 similar? Thanks for any light on this in advance! :)

Hello everybody, Does anybody have a safely procedure about how to disconnect a M board from the whole CS80 system? I think i have identified a bad IC on one voicecard, but before having available spares to swap, i wish to go on with other repairs, and for this reason i would need to 'unplug' that only voicecard from the system. Shall i simply disconnect the -15/+15v supply to that board? (Of course respecting the continuity of the subsequent voice card supply). Thank you for your help and advices.

A friends CS80 just went out of tune on the lower part only. All voices jump up and down more cents than is pleasing to the ear, but still within a semitone. Upper part is stable and nice. My friend said he smelled somthing burnt, but I haven't been able to check anything personally yet. Any ideas what could be the cause of this? SH-board sends same voltages to all M-boards, but is there anything in between there that could go astray? Thanks, Moments Lost - Music and art inspired by Blade Runner. https://soundcloud.com/analogsweden/moments-lost-full-album-snippets -- Fredrik Segerfalk www.analogsweden.com - shop http://www.facebook.com/analogsweden http://soundcloud.com/analogsweden http://analogsweden.tumblr.com/ http://instagram.com/analogsweden http://twitter.com/analogsweden

Hi everybody CS80 users, I recently got a short during calibration on the KAS board, which blew one of the PSU fuse, and created a low resistance in the system, which i could quickly solve by identifying and changing the corresponding damaged IC.So everything should be set to normal right now, all resistances are in the correct range but when i power up the unit, a constant sound plays, kinda detuned one.I can play notes on top of that sound, even though the notes played are not in tune neither, and somewhat hazardous depending on the preset used.Eveything else (tremolo, chorus, ring modulator, filters...) seem to work, but memory/user presets which produce no sound. I suspected the fuses again, since this is close to what happened to one user recently here (and his fuses were off finally) but here, they are all ok. Any suggestions to help focus my searches? Thanks

Hi Joachim, It’s always great having folks collect and provide documentation for synths. However, I don’t know if you’ve seen some of the existing sites that already have done this. Crow’s page, www.cs80.com, has been around a long, long time with lots of good info. My site, http://therogoffs.com/cs80 , has been around many years and has owners and service manuals for almost every Yamaha analog synth along with lots of pics of work on them. I’ve looked into setting up my own forum to replace this Yahoo group since it doesn’t support things like posting RTF or images. However, I haven’t had the time to get it all working. David

In the last five years, I’ve been working on the CS-80 Overall Circuit Diagram. I cleaned the original scan, but also added colors to help localize the boards. A lot of typos and oversights had to be fixed too (using either the service manual, or the CS-80 itself as a reference when needed). The layout of some parts was also modified to make understanding easier (this is particularly noticeable with the M board). The file is provided as is. If you still find errors, feel free to use this topic to list them. I'll update the file. The file is a 14MB jpeg. Due to file uploading issues, I had to put it in a five parts split zip.

Hi ! I am looking for a power supply for the cs-80 . if someone got that in stock ! ( maybe !!, ) .

I have been tuning my CS80 again after several minor repairs and adjustments. I was wondering where to stop knowing, that it's good enough. My CS80 behaves different cold to warm and that is perfectly normal. I tune it warm of course I have managed to tune it that when I turn it on cold - I hear banging of waves on several voices. After a warm-up they slow down and begin sweeping slowly. Other voices are very stable even cold and they stay that way after. I hear very slow sweeping that is good enough for me. Is it Ok or should tuned CS80 stay dead stable without barely any sweeping at all between channels (is that even possible)?

Greetings to all, Has anyone ever taken the time to write down how muchcurrent each board is drawing (on the + and – 15V rail) in a healthy cs80? Or how much overall current one should expect(again on 15v)? If anyone could also tell me what the resistance should befrom the molex, it would help me tremendously!!! Thanks

Hi Martin & all! Couple of notes from your forum manager here. First, I’ll try and take some measurements in a couple of weeks for this. Second, I’ve been in massive crazy mode for the last few months but hope to have something resembling a life very soon. I was laid off a few months back and soon discovered there were no jobs for my work (ASIC design and verification) within commuting distance of my house. My wife and I were thinking of downsizing our house a bit anyway so we went into a whole process of simultaneously Fixing up our house (about 10 years deferred maintenance and me putting holes in walls) Getting an agent and setting up to sell house Me taking some short technical classes in San José Me signing up and starting an online extension program through UCI (Univ California Irvine) Me dealing with EDD (California unemployment office) Me taking many professional development and job search programs Me spending hundreds of hours updating résumé and looking for jobs (in Southern California!!!) Wife and I searching for new place to live near potential jobs and still commuting range to OC for family and wife’s choir. Looking at many new houses in Northern San Diego county and spending untold hours analyzing commute times and nearby shopping and dozens of other parameters. Me having some surgery (after lots of time looking into health insurance - which I have to pay all of now) Finally, about 8 weeks ago, in a matter of a couple of days, we sold our old house, bought a new house, and I got a job! All great news but the last few weeks has been total insanity of packing, moving, unpacking, fixing stuff, working and learning new job, learning to hate traffic on new freeways, my Macbook Pro dying (eventually fixed for free - thank you American Express extra year warranty coverage!!!), and going nuts with the last few weeks of the two online classes I was taking and weeks behind on (one done 2 days ago and other have project and final this weekend). Just a little going on so I haven’t done much in the CS80 world. I have one I need to finish a house call on in the Hollywood hills. Got it figured out and partly fixed on first visit but I didn’t have any $0.05 diodes with me!!! Other is massive overhaul and mod-additions that’s been at my house(s) for way too long but luckily very reasonable owner has been about as slammed as I’ve been so hasn’t been bad about the delays - and he has lots of other synths :) Anyway, classes done this weekend (and only taking one class next quarter - starting mid January) and have two weeks off at end of the month (unfortunately, unpaid since I’m a contractor right now…). I plan to spend the two weeks sleeping a lot and finishing the unpacking which will clear out the area in my garage that will be my new synth workshop. So, barring unforeseen circumstances (hard to type that without breaking out into laughter) I’ll be back on synth stuff by New Year! Sorry - that went on a bit long so I’ll stop now. David (now in Vista, CA - even further away from most of the synth owners up in L.A.)