Yamaha cs-10 tuning

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Garthlore
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Yamaha cs-10 tuning

Unread post by Garthlore » Wed Jan 02, 2019 1:18 pm

He’ll everyone, first post here, so I hope I’m doing this in the right place. I recently got a Yamaha cs-10. It sounds amazing, but the tuning is all over the place. Certain keys are in tune, others are flat or sharp... I’m new to analogue synths and I have to admit the service manual has me scratching my head. I have opened it up, but accessing the main circuit board seems to require removing all of the knobs from the front panel (I’m probably wrong) and before I invest considerable time into breaking my new synth, I’d like to beg any synth-heads out there with knowledge of the cs-10 for some advice. Thank you!
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Re: Yamaha cs-10 tuning

Unread post by Saul » Wed Jan 02, 2019 1:40 pm

Hi Garth, welcome to yamahamusicians.com and also a Very Happy New Year to you :)

I can't remember the last time I saw a CS10 but it must have been about 20 years ago. It's a 40 year old synth!

I don't have a great deal of experience with true analog synths beyond having played quite a few. Some were better than others in regard to tuning but it would often take around 15 minutes before the things settled and the keyboard could be played properly.

I have a vague recollection of someone using an oscilloscope to tune a synth whilst adjusting pots inside. All lost in the mists of time and my fading brain cells :confusion-confused:

Anyway I am pretty sure we will have plenty of members here who will be familiar with the process so hang in there.
Saul
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Re: Yamaha cs-10 tuning

Unread post by parametric » Wed Jan 02, 2019 1:56 pm

Hi Garthlore, and welcome to the forums . . . .

Page 8 of the User Manual states . . .
FUNCTIONS VCO/LFO

(1) TUNE (Interval)

This control functions to adjust intervals.

When turned clockwise, the pitch will increase, and when turned counterclockwise, the pitch will decrease.

This control is employed when tuning the synthesizer to other musical instruments.

Tuning is to be carried out after about 30 minutes have past when the interval have stabilized,

following switch-on of power
Temperature stability was a common "feature :lol: " of analog synths - especially the early ones.

The 1970s MiniMoogs also suffered from this . . . .

Leave it on for half an hour and then try tuning it.

If it is now "stable" - then you have just discovered this "feature" . . . . . :wink:

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Re: Yamaha cs-10 tuning

Unread post by Garthlore » Wed Jan 02, 2019 2:03 pm

Thank you so much for your replies, unfortunately, I have tried letting it warm up for 30 mins. Basically, the tune knob can get one key into tune if it’s off, but it will throw the others off. Essentially, some keys are bang on, others are all out. It’s like the keyboard is out of sync.
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Re: Yamaha cs-10 tuning

Unread post by Saul » Wed Jan 02, 2019 2:19 pm

I understood the "Tune" function was a bit like a transpose? At least that's how I read it in the manual.

Sounds like it needs a little more in-depth tweaking. Either that or the power supply is on the wane. Apparently that can play havoc with tuning because of course an analog synth is very voltage dependent.
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Re: Yamaha cs-10 tuning

Unread post by Miks » Wed Jan 02, 2019 2:39 pm

As far as I'm aware there should be holes at the pcb's for adjusting purposes of the trimming pots?
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Re: Yamaha cs-10 tuning

Unread post by parametric » Wed Jan 02, 2019 2:40 pm

Hmm.

You have to remember that this is a very old synth and it's entirely possible that some of the internal

components have dried out.

I would - locate the power supply section and check that the voltage is correct.

If it is, all well and good. If not, then look at the Capacitors.

Electrolytics are famous for drying out, and the results you are getting may well be due to tolerances

being "out" in such a way as to cause the weirdness you are experiencing.

The Service Manual should tell you how to take it apart . . . . :confusion-confused:

[ I just checked - The Yamaha Manual Library DOESN'T carry the Service Manual - and the only other downloadables I could find online, usefully OMIT the "disassembly procedure" they mention in the Contents . . :roll: ]

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Re: Yamaha cs-10 tuning

Unread post by Garthlore » Wed Jan 02, 2019 2:42 pm

Yes, I think you’re correct with tuning knob. It’s more of a subtle pitch shift to stay in tune with other instruments. I’m by no means knowelable about analogues! I come from fm and digital. But boy does this thing sound amazing. Just wish I could string together some notes!
I don’t think it’s the power supply, as I’m not seeing any other signs, but could be wrong I’m pretty sure it’s a ‘fiddling with pots’ situation.

I’m afraid the device manual that I downloaded, doesn’t have any instructions on dismantling or accessing components. There are detailed schematics of the boards, however.
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Re: Yamaha cs-10 tuning

Unread post by Derek » Wed Jan 02, 2019 2:51 pm

Strange. I had a CS15 from 1982 until about 2009. tuning was rock solid. You didn’t even to wait the “15 minutes” for “thermal equilibrium” as recommended by the manual. I cannot think of a problem where some keys would be in tune. The only thing to do first of all is have a good look around the boards for blown/leaking caps, dry joints (never had one on a Yamaha before), etc.
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Re: Yamaha cs-10 tuning

Unread post by Garthlore » Wed Jan 02, 2019 3:06 pm

Thank everyone. Derek, it sounds like a plan. Any tips for taking her apart?
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Re: Yamaha cs-10 tuning

Unread post by Derek » Wed Jan 02, 2019 8:55 pm

Garthlore wrote:
Wed Jan 02, 2019 3:06 pm
Thank everyone. Derek, it sounds like a plan. Any tips for taking her apart?
Patience, and lost of photographs, so you know how to put it back together again! :)
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