Discussion about the Korg PolySix synthesizer

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. 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?

Cheers,
Andy


On 04/11/2010 22:05, "Paulo" <inocencio66@yahoo.com> wrote:

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> 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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