Discussion about the Korg PolySix synthesizer

--- In PolySix@yahoogroups.com, Andrew Jury <andy@...> wrote:
>
> HI Paulo,
> 
> Just a quick note. Pin 4 is the analogue out of the DAC so you won¹t see any
> data there! This will be a varying current which will change according to
> what is presented to the data input.

Aw I see. Thanks! In the meanwhile I found another broken trace, this time from pin 16 of IC33 to the capacitor. Damn this board is cursed. I´ve been farer from ordering a new one!


> A thought... When you are trying to
> adjust the DAC do you have the top panel controls set as per the Œnormal¹
> settings in the service manual? If you don¹t then you might not be able to
> adjust correctly. Can you check?

Yes, I set the top panel controls as per the service notes. Even EG Intensity at 0, not -5 BTW. 

> Cheers,
> Andy

Likewise. Once again many thanks for your help!

Paulo

> 
> 
> On 04/11/2010 22:05, "Paulo" <inocencio66@...> wrote:
> 
> >  
> >  
> >  
> >    
> > 
> > Hi Andy,
> > 
> > Guess you´re right. Damn, no luck. Still no data out of pin 4! When trying to
> > adjust the D/A, in Test Mode, the Program LEDs that light up are 4 and 8, and
> > VR6 and 7 don´t do a thing.
> > In Normal Mode everything works as it should...
> > 
> > Well, my reasoning is that both VR6 and 7 are connected to pin 4 of the DAC,
> > and subsequently I´m not reading anything out of IC27, the buffer, that should
> > go into ICs 18 and 19. These two should "translate" incoming data into
> > continuous voltage control, but there´s nothing arriving at them.
> > No response from tweaking the continuous controls such as Resonance and Effect
> > Speed is the main problem of this synth.
> > 
> > So what do you think? Maybe this DAC is the real culprit?
> > 
> > Cheers,
> > Paulo
> > 
> >  
> >    
> > 
> > 
> 
> 
> 
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