Yamaha CS80

Cool. Glad it worked.
The pots on these things dry out and give intermittent contact, so a 
good clean every few years tends to help.


B
On 11/11/2013 18:55, pyjamagroove@... wrote:
>
> Well, I did not know which one either so I�ve cleaned all of them. And 
> it worked like a charm! Thanks for the advice Bob.
>
>
>
> ---In yamahacs80@yahoogroups.com, <bob@...> wrote:
>
> Could be one of the VCA potentiometers.
> Can't remember off the top of my head which one is the overall level 
> VCA, but the pots are at the opposite end of the card from the tuning 
> pots.
> I'd start by reflowing the solder on the pot connections. I'd also 
> clean with pots. First with IPA (Iso Propyl Alcohol) and then give 
> them a small amount of EML (Electro Mechanical Lubricant) or similar. 
> Of course you'll need to recalibrate the VCAs after this.
> If you have access to a Scope and the schematics you could probe 
> around the VCAs and see exactly where the signal is dissapearing.
>
> I'm back in the workshop again tomorrow, so will have schematics etc. 
> to hand
>
> B
>
>     On Monday, November 11, 2013, wrote:
>
>         Thanks for response. The thing is there is no sound at all at
>         first ant when it slowly comes back, it's all at once (noise
>         and oscillators), so it can't be the separate pot level.
>
>
>
>         ---In yamahacs80@yahoogroups.com, <laurie@...> wrote:
>
>         the lower controls on the front of the M cards are level
>         adjustments for different amp stages... there is one for noise
>         level, one for VCF level, one for Sine level, and an overall
>         level with an envelope timing one on the bottom... I suggest
>         going to your panel on powere up and seeing if you have sine
>         on voice 1 right away.... if you do, it is before the sine you
>         have issue, if you dont , it is after... it could just be a
>         simple tweak on a touchy pot...
>
>
>                 ------------------------------------------------------------------------
>                 -----Original Message-----
>                 From: pyjamagroove@...
>                 To: yamahacs80@yahoogroups.com
>                 Date: 11/10/13 09:05
>                 Subject: [POSSIBLE SPAM] [yamahacs80] Cs80 voicecard
>                 strange behavior..
>
>                 There is a strange issue with my voice card 1 on
>                 channel 1. After turning the synth on it is completely
>                 mute. But after a warmup and some gymnastics (
>                 adjusting filters, turning osc�s on and off etc.) it
>                 slowly comes back. First as a cutting noise and then
>                 as a full working voice. It is like that every time.
>
>                  I think it�s not related with osc�s and filters. It�s
>                 more like an amplification problem. What could I check?
>
>