WTB - Yamaha CS-70M

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.?

Re: CS50 Calibration

#4595

Hi Florian,

Thank you for your reply.

Bye!
Roby

Re: CS50 Calibration

#4594

Hi Colin,

thank you for your advice!

Roby

Re: CS50 Calibration

#4593

开云体育

Hello

On 21.10.17 00:49 , ColinMuirDorward colindorward@... [yamahacs80] wrote:

?

?The trick is to follow tje voices as they cycle through. Each time.you powerup the unit it resets to voice one.

There is simple help for this. Add a LED driven by the gate of each voicecard:

Someone once said, this might affect the behaviour of the Gate drivers, but I did not measure any significant influence.

Florian

Re: CS50 Calibration

#4596

Tom S. from this list originally ran me through this process. This is my version of his notes (thanks Tom!)

You can probably skip sections 1 and 2: the 4volts on the KAS board and the '0'volts on each individual 'M' board. Try first to go straight for the tuning procedure.

The 'M' board tuning is mainly done with the VR3 and VR2 - this is a VERY important part. This is the SCALE or SPREAD of the keyboard from one end to the other. You MUST understand this. It is very similar to setting the bridge on a guitar where the distance from either end where the strings are need to be exactly the same distance from the 12th fret.

Instructions (The following is done FOR EACH VOICE CARD - separately):

Plug your output into a tuner
Turn on the synth and let it warm up - at least 20 -30 minutes before starting.
Use the FLUTE patch or the panel. If the panel, turn everything off and just use sine wave with an envelope set to sustain it as long as I have a key pressed.
Set to Oct Up position
Center the tuning knob
Play a high note - the Yamaha service notes say a high C, but you could use the highest A for example.
Use a plastic/ceramic trimmer - not a metal screwdriver - as it will affect the pitch. You can get plastic trimmers from electronic wholesalers etc. You can also make one by cutting an old credit card etc.
As long as in the highest transposition you adjust VR3 (little blue multi-turn preset) on a note at the HIGH end of the keyboard
Then adjust VR2 while playing a note on the LOWER end of the keyboard, again, 'C' or 'A'.
Remember - it is the SCALE or SPREAD you are adjusting here. Every adjustment will affect the other one, and you will need to go back and forth between high note (VR3) and low note (VR2) until no more adjusting seems necessary.
Then move on and do the same for the other transpositions.

I am assuming here that you know and understand how to establish which voice card is playing. I usually switch the synth off and on again. My CS makes a little beep sound when it is ready to go. The first key hit will be voice card 1. If you get lost, switch off and on again, just to make sure.

To get  voice 4 (for example) hit one key 3 times, then hold the third hit down while simultaneously adding the next note for voice 4. Release key for voice 3. Continue holding voice 4 and tune your trimmer while doing so

One point - the Yamaha manual says you can TOUCH the track to hear the distortion, so you know which voice card you are on.... DO NOT DO THIS  .... you could blow the VCO chip!!!!! Turn off/on... voice 1 is the first note pressed. Sometimes you will hear a slight distortion as you put your hand - or screwdriver - near the presets - but DO NOT try to touch and tracks on purpose...! Static can kill chips.

best - DT

Re: CS50 Calibration

#4592

Hi Roby,
I followed the cs80 guidelines and it was pretty straight forward. Calibrating 4 voices isnt so bad! The trick is to follow tje voices as they cycle through. Each time.you powerup the unit it resets to voice one.
I didnt have a plastic mini screwdriver so i cut down a wooden chopstick and used that.
Good luck!
Colin

On Oct 20, 2017 4:01 PM, "roby.mx@... [yamahacs80]" <yamahacs80@...> wrote:

Show quoted text

?

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)

Re: CS50 Calibration

#4591

开云体育

Hello Roby,

get the service manual for the CS-50: it contains a complete adjustment procedure.

or

(don't get worried about the cs80 naming of the sub folder)

Florian

On 20.10.17 22:01 , roby.mx@... [yamahacs80] wrote:

Show quoted text

?

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)

CS50 Calibration

#4590

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)

CS-80: Output level down to nothing

#4589

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

Re: IG00150, ribbon controller and levers

#4588

开云体育

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 there.

Regards

John

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On 22 Sep 2017, at 01:45, David Rogoff david@... [yamahacs80] <yamahacs80@...> wrote:

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 remove the Flock or felt covering. Remove the end tags from each end from the old spring to leave the hole exsposed in the tag for the new spring. Bend the each end of the spring?(use the old?as a template)?was and insert the old tags and solder into place. Place in the ribbon caseing and rescrew the two halves back together starting one end and working your way across to the other end. Do not screw tight untill all the screws are back in and you are happy with the position of the spring. Put a curcuit tester on each end and test the action of the spring by pressing here and there along it's length (do not slide you finger along it). Once happy with that, replace the Flock covering and glue in place useing a contact adhesive.

On Sep 21, 2017, at 9:21 PM,?joaopaulosilva12@...?[yamahacs80] <yamahacs80@...> wrote:

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: IG00150, ribbon controller and levers

#4587

开云体育

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 remove the Flock or felt covering. Remove the end tags from each end from the old spring to leave the hole exsposed in the tag for the new spring. Bend the each end of the spring?(use the old?as a template)?was and insert the old tags and solder into place. Place in the ribbon caseing and rescrew the two halves back together starting one end and working your way across to the other end. Do not screw tight untill all the screws are back in and you are happy with the position of the spring. Put a curcuit tester on each end and test the action of the spring by pressing here and there along it's length (do not slide you finger along it). Once happy with that, replace the Flock covering and glue in place useing a contact adhesive.

Show quoted text

On Sep 21, 2017, at 9:21 PM, joaopaulosilva12@... [yamahacs80] <yamahacs80@...> wrote:

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: IG00150, ribbon controller and levers

#4586

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: IG00150, ribbon controller and levers

#4585

Hello

Im need 2 springs ?what is your mail?

Re: IG00150, ribbon controller and levers

#4584

开云体育

Hi Maarten,

I have a small number of replacement Ribbon Springs available to buy so please email me directly for details:

richard@...

Regards

Richard Lawson

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On 21 Sep 2017, at 11:20, maartenhalmans@... [yamahacs80] <yamahacs80@...> wrote:

?

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?

IG00150, ribbon controller and levers

#4583

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?

Re: Troubleshooting the Sub Oscillator Section

#4582

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

#4581

Hi. Do you still have any of those bulbs for sale?

---In yamahacs80@..., <mborish_2000@...> wrote :

I can help you with the panel bulbs. It took me years to find replacements, so I made a group buy and have been supplying bulbs to CS80 enthusiasts ever since. I have some replacement kits left if you are interested.

Regarding your sub oscillator, I can fix it for you if you live in Chicago. Or, If you know a little bit about electronics and can follow my instructions, perhaps I could walk you through the solutions.

-Mike
312-363-7286

Show quoted text

--- In yamahacs80@..., "Tony" <tonymonta2002@...> wrote:
>
> Anyone ?
>
> --- In yamahacs80@..., "Tony" <tonymonta2002@> wrote:
> >
> > Hello to all
> >
> > My CS 80 Sub Oscillator works fine with aftertouch but not direct.
> > And one of the preset selector lamps stopped working (bass) what
> > kind of replacement should i look for ?
> >
> > The other problem i have: my CS 60 is just the opposite the Sub Oscillator works fine direct but not with aftertouch.
> >
> > any clues on these matters ?
> >
> > Thanks in Advance
> >
> > Is there maybe somebody over here who has the complete and correct dimensions for the CS 80 stand ?
> >
>

Re: Troubleshooting the Sub Oscillator Section

#4580

Thank you both Florian and Jonathan. I'll take your advice seriously.

Re: Troubleshooting the Sub Oscillator Section

#4579

its quite true what Florian says ... it's really not something you can approach lightly ... at least not without understanding the interactions of components and circuitry architecture. I have years and years of basic experience and good technical skills with soldering etc. myself but even i find it extremely challenging and most often frustrating. this is not to say you shouldnt do it... but you will have to be extremely committed and spend hundreds of hours learning on simpler things maybe. i do not want to discourage you .... nor does Florian ... but its something you will have to work your way up to ...
.

Re: Troubleshooting the Sub Oscillator Section

#4578

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 "electronics guy" the chances that you will destroy your CS are bigger than the chances that you will repair it.
Just as simple example: one mounting rail of the cards runs supply voltage. If you get the wrong contact between a device in the synth and this mounting rail, you may blow a lot of things...

I am sorry, that I don't have better news for you.

Florian

Am 15.09.2017 um 04:58 schrieb joaopaulosilva12@... [yamahacs80]:

Show quoted text

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 measure the LFO IG00150 chip to see if its good or bad? Mind you, I am not an electronics guy so I would need detailed instructions. I don't have a technician anywhere near where I live so trying to do this solo.

Much appreciated.

_

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