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The following yamahacs80 poll is now closed. Here are the final results Looking for at least nine orders for reproduction CS-80 chrome legs from Rosen Sound Created by: npselliott YES I would be interested in repro CS-80 legs for $50075.00%(3) NO I am not interested25.00%(1) For more information about this group, please visit https://groups.yahoo.com/neo/groups/yamahacs80 For help with Yahoo!Groups, please visit http://help.yahoo.com/l/us/yahoo/groups/original/members/forms/general.html

Hi Guys, Any of you think it's time to sell your beloved CS-80 ? Then please contact me ! Cheers, Phil

Enter your vote now! Looking for at least nine orders for reproduction CS-80 chrome legs from Rosen Sound Created by: npselliott Thanks!

I have to depart with my CS80. Good shape, everything works. Some maintenance, tuning and setting can make it even better. Original stand, pedal, score stand, wheels in original soft case. Original Owner’s manual, Service Manual & big folders full of other documents printed from internet. 11111 USD, buyer has to arrange pick up and delivery. I’m in Japan near Nagoya. Best regards. Daniel Forro

Hello all, Scott here (synthRodriguez) and new to the group. I recently bought a CS80 project machine which will soon receive attention. One of the black keys took a hit at some point; it has a pretty good chunk out of it. Would someone have a spare they would be willing to sell? Thanks! Scott in Ohio

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 : /IMG_6912_small.mp4 Uploaded by : unfrostedpoptart <david@...> Description : Added sample-hold to Sub Oscillator You can access this file at the URL: https://groups.yahoo.com/neo/groups/yamahacs80/files/IMG_6912_small.mp4 To learn more about file sharing for your group, please visit: https://help.yahoo.com/kb/index?page=content&y=PROD_GRPS&locale=en_US&id=SLN15398 Regards, unfrostedpoptart <david@...>

Fellow CS-80 owners, with the power off, could you please do me a solid and measure the resistance between the +15V power rail on the card riser (the lower bar that the cards screw into) and ground. I am trying to figure out if the 70 ohms I'm getting is normal or if this is indicative of a partial short. Thanks! Cheers, Jonathan

There’s a CS70m for sale in Philadelphia; they’re quite uncommon even less so than the 80s-Ron Ron Joseph ________________________________ Sent: Wednesday, January 31, 2018 9:56:01 AM To: yamahacs80@... Subject: [yamahacs80] Digest Number 1470 [Yahoo! Groups] <https://groups.yahoo.com/neo;_ylc=X3oDMTJlOHZhNmI5BF9TAzk3MzU5NzE1BGdycElkAzEzMjg3MTkxBGdycHNwSWQDMTcwNTAzMjE0NARzZWMDZnRyBHNsawNnZnAEc3RpbWUDMTUxNzQxMDU2MQ--> Yamaha CS80 Group <https://groups.yahoo.com/neo/groups/yamahacs80/info;_ylc=X3oDMTJlbnUwdHA2BF9TAzk3MzU5NzE1BGdycElkAzEzMjg3MTkxBGdycHNwSWQDMTcwNTAzMjE0NARzZWMDaGRyBHNsawNocGgEc3RpbWUDMTUxNzQxMDU2MQ--> 5 Messages Digest #1470 1a Re: L'il help needed.. by jonathan4051 1b Re: L'il help needed.. by "Kyle Jarger" jkjelec2002 1c Re: L'il help needed.. by jonathan4051 1d Re: L'il help needed.. by jonathan4051 2a Re: WTB - Yamaha CS-70M by "V CL" virusindigo2 Messages 1a Re: L'il help needed.. <https://groups.yahoo.com/neo/groups/yamahacs80/conversations/topics/4677;_ylc=X3oDMTJyZmM5aWswBF9TAzk3MzU5NzE1BGdycElkAzEzMjg3MTkxBGdycHNwSWQDMTcwNTAzMjE0NARtc2dJZAM0Njc3BHNlYwNkbXNnBHNsawN2bXNnBHN0aW1lAzE1MTc0MTA1NjE-> Thu Jan 25, 2018 7:47 pm (PST) . Posted by: jonathan4051 <mailto:jonathan4051@...?subject=Re%3A%20L%27il%20help%20needed%2E%2E> Don't all shout out at once.. Reply to sender <mailto:jonathan4051@...?subject=Re%3A%20L%27il%20help%20needed%2E%2E> . Reply to group <mailto:yamahacs80@...?subject=Re%3A%20L%27il%20help%20needed%2E%2E> . Reply via Web Post <https://groups.yahoo.com/neo/groups/yamahacs80/conversations/messages/4677;_ylc=X3oDMTJyNXYzMjcyBF9TAzk3MzU5NzE1BGdycElkAzEzMjg3MTkxBGdycHNwSWQDMTcwNTAzMjE0NARtc2dJZAM0Njc3BHNlYwNkbXNnBHNsawNycGx5BHN0aW1lAzE1MTc0MTA1NjE-?act=reply&messageNum=4677> . All Messages (4) <https://groups.yahoo.com/neo/groups/yamahacs80/conversations/topics/4671;_ylc=X3oDMTM2bGlydjBkBF9TAzk3MzU5NzE1BGdycElkAzEzMjg3MTkxBGdycHNwSWQDMTcwNTAzMjE0NARtc2dJZAM0Njc3BHNlYwNkbXNnBHNsawN2dHBjBHN0aW1lAzE1MTc0MTA1NjEEdHBjSWQDNDY3MQ--> . Top ^ 1b Re: L'il help needed.. <https://groups.yahoo.com/neo/groups/yamahacs80/conversations/topics/4678;_ylc=X3oDMTJyc3J1N3VkBF9TAzk3MzU5NzE1BGdycElkAzEzMjg3MTkxBGdycHNwSWQDMTcwNTAzMjE0NARtc2dJZAM0Njc4BHNlYwNkbXNnBHNsawN2bXNnBHN0aW1lAzE1MTc0MTA1NjE-> Fri Jan 26, 2018 9:01 am (PST) . Posted by: "Kyle Jarger" jkjelec2002 <mailto:jkjelec@...?subject=Re%3A%20L%27il%20help%20needed%2E%2E> Fellow CS-80 owners, with the power off, could you please do me a solid and measure the resistance between the +15V power rail on the card riser (the lower bar that the cards screw into) and ground. I am trying to figure out if the 70 ohms I'm getting is normal or if this is indicative of a partial short. Thanks! Cheers, Jonathan I don't have one here, but 15V/70 ohms = 214 mA, which seems a low amount of current for all of those voice boards. But since it's not powered on, it might be a reasonable impedance for this situation. Certainly 70 ohms is nowhere near a short circuit, given the large amount of circuitry present. It's not clear to me if a shorted component/capacitor would NOT show a short when no power was present, but then go short when power was applied...I don't think so... jkjelec Reply to sender <mailto:jkjelec@...?subject=Re%3A%20L%27il%20help%20needed%2E%2E> . Reply to group <mailto:yamahacs80@...?subject=Re%3A%20L%27il%20help%20needed%2E%2E> . Reply via Web Post <https://groups.yahoo.com/neo/groups/yamahacs80/conversations/messages/4678;_ylc=X3oDMTJydGxsZHFvBF9TAzk3MzU5NzE1BGdycElkAzEzMjg3MTkxBGdycHNwSWQDMTcwNTAzMjE0NARtc2dJZAM0Njc4BHNlYwNkbXNnBHNsawNycGx5BHN0aW1lAzE1MTc0MTA1NjE-?act=reply&messageNum=4678> . All Messages (4) <https://groups.yahoo.com/neo/groups/yamahacs80/conversations/topics/4671;_ylc=X3oDMTM2bWV1dnA0BF9TAzk3MzU5NzE1BGdycElkAzEzMjg3MTkxBGdycHNwSWQDMTcwNTAzMjE0NARtc2dJZAM0Njc4BHNlYwNkbXNnBHNsawN2dHBjBHN0aW1lAzE1MTc0MTA1NjEEdHBjSWQDNDY3MQ--> . Top ^ 1c Re: L'il help needed.. <https://groups.yahoo.com/neo/groups/yamahacs80/conversations/topics/4679;_ylc=X3oDMTJyMDMzMzVqBF9TAzk3MzU5NzE1BGdycElkAzEzMjg3MTkxBGdycHNwSWQDMTcwNTAzMjE0NARtc2dJZAM0Njc5BHNlYwNkbX

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 output level at all. Could it be that the Audio Amp. Ic (HA 1452W) has gone south? Thanks

Hello all, I'm a longtime lurker but wanted to say thanks for this group -- its a treasure trove of information and resources. I love vintage Yamaha synths and have a few myself -- CS-30, CS-50/60, CS-40M, SK-30. I've been looking to acquire a Yamaha CS-70M and was wondering if anyone might have one for sale. If so, please drop me a line to discuss. I also have a fair number of other synths I may be willing to part with if there's interest in a trade + cash deal. I'm based in western Canada (BC) if shipping is required. If you happen to be in BC, Alberta, or Washington state/Oregon I'm also willing to drive a fair distance to acquire one. Thanks so much... hope to hear from you.

Hi All, I've got a likely fully working KAS Board up for auction in the US on E-bay: https://www.ebay.com/itm/Yamaha-CS80-CS-80-vintage-synth-KAS-Board-YM-26600-and-YM-26700-IC-chips/152875868286?hash=item23981ca07e:g:oYAAAOSwRLZaXp7m Regards, Kyle jkjelec

Hi all. After one year (moved to a new house) I switched my CS-80 on and fortunately everything still works fine, but the FC-7 connected to it. The malfunction is: when I push the pedal forward it raises the volume /wha-wha regularly, but when I go back down to the “low “ position, the volume takes some seconds before fading. In other words, when used fot raising the volume it works, when lowering it, it is … delayed. Like a long release… Any clue? Thanks Fernando

Has anyone ever looked into modern alternatives for these fragile and rare 40-year old chips? I am wondering if it'd be possible to program an Arduino to handle key coding/assigning and D/A conversion on the KAS and KBC boards. Cheers, Jonathan

Hello, I am looking for technical help for a Yamaha CS-80. The issue it is having is: a cluster of six notes (G2 to C3) generate full volume at all times when keyed, no matter how softly they are played. I have traced the problem to IC4 (a newer 4051 multiplexer) on the TSB circuit board, and have tested the chip with a multimeter. The INH pin 6 is not stuck high and is toggling as it should. Pin 3 (Com in/out), however, is stuck at +15V for some reason, and I can't seem to figure out why. I believe this voltage should be around 5V as initial velocity is triggered and approach 15V as the poly aftertouch is applied. I tried swapping in another 4051 from IC3, and the problem remains exclusive to the IC4 socket and the same cluster of keyboard notes. I've also checked the solder underneath for shorts and opens and compared it to the other 4051's on the board and haven't found anything out of the ordinary. Does anyone have any idea as to where I should look next? Could the IC7 (a JRC 072BD dual op-amp, also a recent replacement of the original 4558) that pin 3 goes to be involved? Could a faulty TKC board component be causing the problem? Any help would be greatly appreciated. Thanks! Cheers, Jonathan

Hi Florian - I think you are the moderator of the CS80 group? Do you know anything about changes to Yahoo's programming that has been causing problems? I do not seem to be able to access the CS80 group - nor any other yahoo group i am a member of! Have you heard of this? Do you know if there's another way to access it (apart from the links in the e-mails)? I am using Firefox on an apple computer (since it became impossible for similar reasons to access yahoo groups on safari some time last year) thank you very much and sorry to bother you

My name is Murilo from Brazil and I have a Yamaha CS80 for around 7 years. In those 7 years it’s been through repair and now I have no sound out of it. The CS80 powers normally, but no sound… Only low noise (if I switch on the chorus, i can hear it affecting this noise) Brazil is a crazy country and we don’t have enough technicians to repair it… So, I’m wondering if you can help me in any way. I’ve already changed death master VCA (chip Ig00159) and nothing… Do you guys have any ideas? I have the possibility to change for a Arp 2600. I know is a different beast, but.... Should I? Just out of curiosity, what synth would exchange for If you guys were in my boots? Thanks In advance!!! -- Murilo Faria (Mura) aldotheband.com

Hi all, I have a Yamaha CS-60 I recently acquired from a local seller that has MIDI kit installed. 1. Upon testing I noticed the sub oscillator LFO > VCO slider does not work/effect the sound (however, LFO > VCF and LFO > VCA do work fine). What is the likely culprit for this and how easy is it to fix? 2. I notice after getting the synth home and playing it for awhile, that intermittent random bad notes would happen when playing the keys. It doesn't seem to matter what keys and it seems to happen randomly... ie after a few minutes or after 20 minutes. As an example, if I'm playing a scale and I hit one of the keys (ie a middle C), that will give a severely out of tune note. Coming back to the key immediately after and its in tune again. Any ideas what could cause random bad note behaviour across the keyboard? It doesn't seem to be a specific voice, but I have no idea what is triggering a bad note to occur randomly. Perhaps the MIDI retrofit messed something up, or when the synth was transported to my place the voice cards got jiggled around from bumpy driving? Any suggestions on where to look for fixing this/effort required would be most welcome. I'd need to take it to a tech and hoping it won't be an expensive fix. Thanks.

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 calibration, and I want to ask you what is the best documentation to do this. I've seen that there is an adjustment procedure document for the CS80, but I haven't found a similar document for CS50. For what I've understand some parts are common in the two synths (e.g. the Voice cards), but I'm not sure if it is correct to follow the adjustment procedure described in the CS80 doc. Thank you very much for your help! Roby (Italy)

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. I managed to get most of the chips but I can not find a IG00150 also known as M51620P. I need one for the Chorus, syntparts does not have them and I tried a lot of sources. So if someone has stock please let me know. The ribbon controller is not working, I opened the ribbon yersterday and found out that the spring inside is in a lot pieces. Are there replacement for these or are there other solutions to get the ribbon working again. Is it possible to open the control levers? Some of them are a bit noisy/scratchy. Thanks for all the input! Maarten