Discussion about the Korg PolySix synthesizer

Hi Peter,

Your P6 problem is really starting to bug me! Could you take a 
voltage measurement from IC17 between pins 5, 6, and 7 and ground? It 
will be interesting to see what is going into the mux.

Cheers,
Andy

--- In PolySix@yahoogroups.com, "Andrew Jury" <andy@...> wrote:
>
> Peter,
> 
> The logic probe measures whether logic states in TTL or CMOS 
> circuitry are a binary 1 or 0. Remember we talked about how the 
> binary pattern on lines A, B, C, INH set which outputs on IC31 are 
> selected? This tool would tell us how they are set and whether they 
> were switching on a the right time.
> 
> However, from the description how the six LEDs are lighting up 
(yes, 
> one after the other in POLY mode - I am an idiot!) it sounds like 
> IC31 is working correctly and keyboard assigner is sending the 
right 
> binary pattern to the switch. 
> 
> I expect the input on pin 3 is the problem. What I will do is take 
> some reading from my working Polysix and let you know how the 
> circuitry should function. I'll post this after the weekend, if you 
> can wait.
> 
> Also, I'll take you are playing with the settings in manual mode 
and 
> not from the patch banks? When the SRAM (memory) failed on my P6 
the 
> patch banks just contained random bit patterns which produced sound 
> which could be very much be described as 'out of tune'! Just a 
> thought...
> 
> Cheers,
> Andy
> 
> 
> 
> 
> --- In PolySix@yahoogroups.com, "hjulskov" <hjulskov@> wrote:
> >
> > Thanks Andy,
> > 
> > The LEDS (D10) does light in order in polymode (which I think was 
> what
> > you meant?) -in unison they all light simultaniously.
> > In Polymode all voices sounds equally (bad).
> > 
> > 
> > I'm not sure about your last question (Can you lay your hands on a
> > logic probe at all?)?  
> > 
> > 
> > Cheers,
> > Peter
> > 
> > 
> > --- In PolySix@yahoogroups.com, "Andrew Jury" <andy@> wrote:
> > >
> > > Hi Peter,
> > > 
> > > I am afraid we can't make that assumption until the logic that 
> controls 
> > > IC31 has been tested. This device is basically a switch. You 
> apply a 
> > > binary pattern to lines A, B, C and INH and this determines 
which 
> one 
> > > of the outputs is connected to the input. The input is marked X 
> the 
> > > outputs marked X0, X1, X2, etc. It is the outputs which we just 
> tested 
> > > and which don't seem to move. Tell me, do the voice LEDs (D10) 
> come on 
> > > in order in Unison mode? Everytime you press a key an alternate 
> voice 
> > > LED should light up. I suspect not?
> > > 
> > > Can you lay your hands on a logic probe at all?
> > > 
> > > Cheers,
> > > Andy
> > >
> >
>