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The issue persists without the 4050 chips. Here is a video of the issue if you care to watch. Hard to hold the camera and play so don't expect Stanley

What I mean is, remove the IC4 & IC5 chips completely and then power on the synth without those chips on the KAS board. Does the problem still persist? [email protected]> wrote:

Hi Scott, I've socketed and replaced the 4050 chips but the KB control problem persists (it may have helped with the ribbon pitch issue as i'm not noticing that now). I'll swap out the 4006s when I

Regarding the Keyboard Control issue, the outputs are very separate and very segregated from physical pitch voltage inputs downstream, so thinking about upstream... On the large KAS board, are the

Glad you found the issue! I've installed a couple of those boards and I add quick disconnects (or connects as the case may be) and a set of instructions that allows the user or a tech to quickly

I repaired a CS60 once that showed bizarre pitch issues, where controls that weren't expected to affect pitch actually did cause pitch drifts. In this case the cause was that the grounds between the

Argh... please disregard my last message. Your were onto it - the midi board was the source of a bunch of those issues. I received the Kenton install instructions and now I know that traces and wires

Hi Scott, I have had a more thorough going over it and here is the symptom list: Drone single note when midi board installed with analog in/out ribbon connected to Kenton board. All keys play the

Hi Scott, thanks for your input. I'll verify the PSU today. I suspected the Kenton board as well and removed the board and the issues are the same.? I've checked the installation for shorts or

Thinking about this some more and the way it's behaving, it sounds like the Kenton board may be the problem. It's hard to imagine a non-Kenton unit displaying those mannerisms and all of the items

Those are some weird issues. As always, step 1 is to verify power. Use a meter to check for voltage and ripple or better yet use a scope. +15, -15, +10.6, -6.5, +8.5 should all be pretty close. If

Hi CS80 gurus, owners and fans. I have a CS80 with Kenton midi that I have owned since 2012 and recently put into storage for three years. The synth was working fine prior to storing but now there

Hey Michael and everyone, I am indeed part of the group and thanks for chiming me in :) As Michael stated, the resonance seems to “collapse” when you adjust too far, but iirc I noticed if you

Hi Mike, MFox here. :) Just a few additional words. I was really struggeling with the resonance, it always collapsed when I dialed it to the specs, but not on every voiceboard, some made it collapse

Hello Mike, I have a CS-80 that repaired long, long time ago, more than 20 years.... I have the tech manual, but it is very far from me, now. to see it and go to the point. But I remember one thing

Mike: For the CS-80, when referencing the *Adjustment Procedure* document, below is what I have learned about the typos and inaccuracies on the filter and vca adjustment docs and how I do it. *VCF -

I'm just putting the finishing touches on a CS-80 planned for sale in Chicago, IL USA.? I've really gone over almost everything in this one.? All new electrolytic caps, all new CMOS, full

I'm asking this question basically to see how people have approached the filter and VCA tuning discrepancies in the service manual.? I've read several different opinions on them, but have yet to find

Hi. I have had 3 CS80s in the studio, once they have settled in for a few days, I do the complete calibration. I calibrated all three once a year, but just to get the beats the way I like them,

Honestly it should have gone for more. Selling the dream of owning a CS-80 with a view of downtown Los Angeles is right out of the film Blade Runner. This experience is completely priceless.