Yamaha CS80

Hi guys, wonder if anyone has had this one before... thought I'd ask first in case anyone could point me to it.

I just started to have a go at my out-of-tune 'M' card.
CP6 reads 0.5volts - when all the others read around 1.4volts

The voice is out of tune, and low in pitch. When I play that voice and then measure CP6, the pitch rises due to my meter prong's contact.

(I was thinking one of the FET's or IC7..?)

Cheers,
TOM

Funny, I was just doing the same with my Jupiter-8 this morning: touch the DVM probe to pin 2 of IC 2B on the voice board and the pitch rises.

--- In yamahacs80@yahoogroups.com, "Quazimodo" <noddyspuncture@...> wrote:
>
> Hi guys, wonder if anyone has had this one before... thought I'd ask first in case anyone could point me to it.
>
> I just started to have a go at my out-of-tune 'M' card.
> CP6 reads 0.5volts - when all the others read around 1.4volts
>
> The voice is out of tune, and low in pitch. When I play that voice and then measure CP6, the pitch rises due to my meter prong's contact.
>
> (I was thinking one of the FET's or IC7..?)
>
> Cheers,
> TOM
>

Still checking voltages here - so I have an update on this fault. It seems the voltage on CP6 varies quite a bit... but all cards vary 'in unison'... so my origianl reading of 1.4 volts is just one of many values that appear at that point. But this faulty card is always a lot lower in value. Could that be a clue as the problem? I am just hoping it's not a VCO chip gone - yet AGAIN..!

I also have a filter problem on another M card. On certain voices (it is more apparent on Strings presets than Brass...) the filter is very 'thin'. I am getting a constant 5volts on pin 8 of IC1, the VCA - where the other good cards have a varying voltage. Would this indicate a faulty VCA chip?

Cheers,
TOM

--- In yamahacs80@yahoogroups.com, "Quazimodo" <noddyspuncture@...> wrote:
>
> Hi guys, wonder if anyone has had this one before... thought I'd ask first in case anyone could point me to it.
>
> I just started to have a go at my out-of-tune 'M' card.
> CP6 reads 0.5volts - when all the others read around 1.4volts
>
> The voice is out of tune, and low in pitch. When I play that voice and then measure CP6, the pitch rises due to my meter prong's contact.
>
> (I was thinking one of the FET's or IC7..?)
>
> Cheers,
> TOM
>

Recorded live at the Analog Sweden studio. Yamaha CS-80, Roland System
100, Yamaha CP-70. Enjoy :)
http://www.youtube.com/watch?v=4Uu_6Lk0Tig

Download https://soundcloud.com/analogsweden/blade-runner-lost-city

--

Fredrik Segerfalk

www.analogsweden.com
http://www.facebook.com/analogsweden
http://soundcloud.com/analogsweden
http://analogsweden.tumblr.com/

Very nice. I gave you a like and a comment on YouTube. I'm just about to
listen to your other tracks on Soundcloud as well.

Beautiful... very tastefully done, all the way through. Thanks for
sharing that.

On 3/26/2013 9:41 AM, Fredrik Segerfalk wrote:
>
> Recorded live at the Analog Sweden studio. Yamaha CS-80, Roland System
> 100, Yamaha CP-70. Enjoy :)
> http://www.youtube.com/watch?v=4Uu_6Lk0Tig
>



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

On 3/26/2013 9:41 AM, Fredrik Segerfalk wrote:

>
> Recorded live at the Analog Sweden studio. Yamaha CS-80,
> Roland System 100, Yamaha CP-70. Enjoy :)
> http://www.youtube.com/watch?v=4Uu_6Lk0Tig

Wow!

Mycket bra. :-)

/mr