Yamaha CS80 group photo

Yahoo Groups archive

Yamaha CS80

Index last updated: 2026-03-31 22:34 UTC

Thread

MY CS-80 IS SICK. HELP!!

MY CS-80 IS SICK. HELP!!

2012-06-16 by jesus

Hi, group,

My beautiful CS-80 has a minor issue: One of the upper-row voices seems to only have the sine wave suboscillator, but no VCO-VCF in it. This is obviously more noticeable if I silence the bottom row, and if I mix both rows equally it becomes barely perceptible, kinda' like a muffled note caused by hitting the key too slowly.
It is a barely-noticeable "blemish", but I hate it.

Anybody want to tackle this one?
I have tried contacting Old Crow using the email from his CS80 site, but it bounces back.

Hope you guys can come up with a solution.

Thanks!!!

JDiaz

Re: [yamahacs80] MY CS-80 IS SICK. HELP!!

2012-06-16 by David Rogoff

Hi!

Could be a few things:
Wave converter chip creates the saw/square
One of the filter chips
VCA that controls the filter level

Hope for the last one, since that's just one of the IG00151 VCA chips
that are all over the CS80 - and other Yamaha synths and organs - and
pretty easy to get.

Should be very easy to trace with a scope - or even a amplifier if
you're low tech. Where are you located?

David

jesus wrote:
Show quoted textHide quoted text
> Hi, group,
>
> My beautiful CS-80 has a minor issue: One of the upper-row voices seems to only have the sine wave suboscillator, but no VCO-VCF in it. This is obviously more noticeable if I silence the bottom row, and if I mix both rows equally it becomes barely perceptible, kinda' like a muffled note caused by hitting the key too slowly.
> It is a barely-noticeable "blemish", but I hate it.
>
> Anybody want to tackle this one?
> I have tried contacting Old Crow using the email from his CS80 site, but it bounces back.
>
> Hope you guys can come up with a solution.
>
> Thanks!!!
>
> JDiaz
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>

Re: [yamahacs80] MY CS-80 IS SICK. HELP!!

2012-06-16 by Max Fazio

Hi Jesus
Does it happen with the presets too?
Whatever,I’d try looking first checking output 16 and 16’ and the A to F and Ato E inputs on the T51 and T52 boards.
M

From: jesus
Sent: Saturday, June 16, 2012 7:05 PM
To: yamahacs80@yahoogroups.com
Subject: [yamahacs80] MY CS-80 IS SICK. HELP!!


Hi, group,

My beautiful CS-80 has a minor issue: One of the upper-row voices seems to only have the sine wave suboscillator, but no VCO-VCF in it. This is obviously more noticeable if I silence the bottom row, and if I mix both rows equally it becomes barely perceptible, kinda' like a muffled note caused by hitting the key too slowly.
It is a barely-noticeable "blemish", but I hate it.

Anybody want to tackle this one?
I have tried contacting Old Crow using the email from his CS80 site, but it bounces back.

Hope you guys can come up with a solution.

Thanks!!!

JDiaz





[Non-text portions of this message have been removed]

Re: [POSSIBLE SPAM] [yamahacs80] MY CS-80 IS SICK. HELP!!

2012-06-16 by Laurie Curry

Jesus..... first make a patch with White noise....... If the white noise works on all voices properly it wont be in the filter.....

If not a filter issue, secondly take out the whitenoise and add the squarewave without pwm and the saw wave...... remove sine wave altogether from VCA section....
If notes are dissapearing here, check the capacitor or traces travelling from the VCO chip out to the waveshaper chip on the voice card that has no sound... I think you may have a break there... a dead cap would allow some sound thru, but very weak.... a break in a trace may cut everything altogether...... FYI... sin wave and noise bypass the wave shape chip, so that is how you tell if it is the waveshaper, or the Filter itself....

-----Original Message-----
From: jesus <gretchen.lipke@...>
To: yamahacs80@yahoogroups.com
Date: 06/16/12 12:09
Subject: [POSSIBLE SPAM] [yamahacs80] MY CS-80 IS SICK. HELP!!


Hi, group,

My beautiful CS-80 has a minor issue: One of the upper-row voices seems to only have the sine wave suboscillator, but no VCO-VCF in it. This is obviously more noticeable if I silence the bottom row, and if I mix both rows equally it becomes barely perceptible, kinda' like a muffled note caused by hitting the key too slowly.
It is a barely-noticeable "blemish", but I hate it.

Anybody want to tackle this one?
I have tried contacting Old Crow using the email from his CS80 site, but it bounces back.

Hope you guys can come up with a solution.

Thanks!!!

JDiaz









[Non-text portions of this message have been removed]

Re: MY CS-80 IS SICK. HELP!!

2012-06-16 by jesus

>
> Hi!
>
> Could be a few things:
> Wave converter chip creates the saw/square
> One of the filter chips
> VCA that controls the filter level
>
> Hope for the last one, since that's just one of the IG00151 VCA chips
> that are all over the CS80 - and other Yamaha synths and organs - and
> pretty easy to get.
>
> Should be very easy to trace with a scope - or even a amplifier if
> you're low tech. Where are you located?
>
> David<<<<


Hi,

Thanks for the tips. I live in North Florida.

Re[2]: [POSSIBLE SPAM] [yamahacs80] MY CS-80 IS SICK. HELP!!

2012-06-16 by Laurie Curry

once you locate the failing memory card, check on the lower front of the memory cards... there are level controls for different amps..I would first look here..although there are several to turn I know , there is a master level contol, a sine level control one that is VCF out and I believe one that is just noise level.... you are looking for the VCF out because both noise and waveshaper go through there.... could just be a bad spot on that trim pot...... both the master level and sine level will raise the sine volume.... these are not the ones you need to move... if this isnt a solution, perhaps it is a chip...or a trace in the path... I believe David adressed the chip in question...


-----Original Message-----
From: jesus <gretchen.lipke@...>
To: yamahacs80@yahoogroups.com
Date: 06/16/12 14:19
Subject: Re: [POSSIBLE SPAM] [yamahacs80] MY CS-80 IS SICK. HELP!!




Hi,

You guys are great. thanks!

I just checked it out again, and the noise does not go through. The only thing that goes through is the sine wave, as I said before.

What could this be?









[Non-text portions of this message have been removed]

Re: MY CS-80 IS SICK. HELP!!

2012-06-17 by synthparts

If it is any of those chips, I have them.

Doug
synthparts.com
Show quoted textHide quoted text
--- In yamahacs80@yahoogroups.com, David Rogoff <david@...> wrote:
>
> Hi!
>
> Could be a few things:
> Wave converter chip creates the saw/square
> One of the filter chips
> VCA that controls the filter level
>
> Hope for the last one, since that's just one of the IG00151 VCA chips
> that are all over the CS80 - and other Yamaha synths and organs - and
> pretty easy to get.
>
> Should be very easy to trace with a scope - or even a amplifier if
> you're low tech. Where are you located?
>
> David
>
> jesus wrote:
> > Hi, group,
> >
> > My beautiful CS-80 has a minor issue: One of the upper-row voices seems to only have the sine wave suboscillator, but no VCO-VCF in it. This is obviously more noticeable if I silence the bottom row, and if I mix both rows equally it becomes barely perceptible, kinda' like a muffled note caused by hitting the key too slowly.
> > It is a barely-noticeable "blemish", but I hate it.
> >
> > Anybody want to tackle this one?
> > I have tried contacting Old Crow using the email from his CS80 site, but it bounces back.
> >
> > Hope you guys can come up with a solution.
> >
> > Thanks!!!
> >
> > JDiaz
> >
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >
> >
>

Re: MY CS-80 IS SICK. HELP!!

2012-06-17 by jesus

Allright, thank you, guys!

Now, I should have mentioned a "minor" issue: I have the technical skills of a locust. The most I've ever done is open up my old CS50 and muck with one of the sound cards that had issues with the filter Q, but otherwise I'd be terrified to ruin my otherwise beautiful CS-80.
Anybody could recommend a good technician in the vecinity of Northeast Florida, USA? With the current going prices for these beasts nowadays, it would be a worthwhile investment to have somebody check it out here, instead of me shipping the massive mutthafuckah.
This is my one "pry off my cold, dead fingers" keyboard, and I'll try my best to keep it healthy.

THanks!!!

JD