Yamaha CS80

Hi Kent,

I just stumbled across this because I do not get a proper sine wave on the IC5 pin 13 Tremolo/Chorus section with the M-boards providing a plain sine wave and output level 80mV only. If I increase this to 200mV then it looks good. However, I worry about overloading the effect section then. 

The initial VCA trims on TRG boards is for setting up the touch response? I have still 10 pages to go on the complete tuning procedure...

G.



-------- Original-Nachricht --------
> Datum: Sun, 14 Dec 2008 12:36:42 -0000
> Von: "kent_spong" <kent_spong@...>
> An: yamahacs80@yahoogroups.com
> Betreff: [yamahacs80] Re: M-Board output level- typo in adjustment procedure?

> Hi Gregor,
> 
> I would imagine that most people would not go too mad on this value 
> really. I would worry more about initial vca trims on Trig 1 and 2 
> boards and then use vr14 on the m boards as a final tweak in a 
> calibration process.
> 
> 
> 
> 
> 
> 
> --- In yamahacs80@yahoogroups.com, "willgregori" <will.gregory@...> 
> wrote:
> >
> > Dear CS-80 friends,
> > 
> > while tuning my CS-80 according to Yamaha\ufffds adjustment procedure I 
> > wonder about the VCA #4 gain value (step 4 on page 15). This VCA 
> sets 
> > the individual output level of each Voiceboard. 
> > 
> > According to the manual it should be adjusted with VR14 to 80mV pp.
> > 
> > This is ridicoulus low and my CS-80 came with a much higher level 
> on 
> > each card, so I am not sure if the value in the manual is correct.
> > 
> > As I understand, increasing the output level of each card would 
> result 
> > into a better S/N ratio but could overload the following output 
> stages 
> > (PRA, Effect section etc.) if set too high, especially when playing 
> 8 
> > voices together. 
> > 
> > Has anybody figured out already if those 80mV are accurate or if it 
> is 
> > recommended to adjust to a higher value here? To my feeling 
> something 
> > between 200 and 400mV should be more useful,
> > 
> > Thanks, Gregor
> >
> 
>