Or maybe i forget some more features that dont work..I am 100% sure that those you have included in your post dont work at all...
--- In korgpolyex@yahoogroups.com, Michael Hawkins <korgpolyex800@...> wrote:
>
> It sounds to me like you should be looking for problems with the digital to analog converter and then perhaps the multiplexer that drives the analog signal out to the various controls for the DCO MG, VCF MG and the master volume control.
>
> Check the following and let us know which ones work and which ones don't work:
>
> 1) parameter 17 - DCO 1 volume control
> 2) parameter 27 - DCO 2 volume control
> 3) parameter 33 - noise level
> 4) parameter 41 - VCF cut off
> 5) parameter 42 - resonance
> 6) parameter 83 - DCO modulation
>
> 7) parameter 84 - VCF modulation
> 8) joystick bend
>
> If NONE of these work then the D2A converter, the sample and hold and the multiplexer sections need to be checked.
>
> If some of them work then the D2A converter is probably OK but the sample and hold and multiplexer sections need to be checked.
>
> Mike
>
>
>
> ________________________________
> From: iamakisgr <iamakisgr@...>
> To: korgpolyex@yahoogroups.com
> Sent: Monday, December 26, 2011 5:20 PM
> Subject: [korgpolyex] Re: Problem with my poly800 reverse keys edition... :/
>
>
> Â
> There are many functions that dont work..
> first of all the filter...
> The chip works cause i tested it with a pot and 3 volt directly and it responds ok...
> I couldnt find the problem going back to beggining of the signal..
> Maybe i dont know enough to fix it or i cant consentrate,thats why i am asking what to check first...
> Thanks everyone for trying to help me.
> If theres anything i can make to help you understand whats the problem and what i have done so far in testing and checking please tell me and i will try to explain the best way i can..
>
> --- In korgpolyex@yahoogroups.com, Gordon JC Pearce <gordon@> wrote:
> >
> > On Mon, 26 Dec 2011 15:25:20 -0000
> > "iamakisgr" <iamakisgr@> wrote:
> >
> > > Well..I have tried all that..
> > > I even connected +/- 5volts from a pc psu at the points that the service manual said i should check and have 5 volts...
> > > I have sound to the output but the filter dont work at all nor the eg, nor the lfo...
> > > I just hear the wave with no cutoff (too bright) and no resonanse..
> > > I tried alternating them from the menu but nothing happened.. :/
> > > Any other suggestions?
> > > What should i look for before changing everything on the motherboard except the eeprom, the sound chip and the filter chip which i have tested and they work?
> >
> > You need to stop all this poke and hope stuff, and start trying to diagnose the problem.
> >
> > First off, what works? What doesn't work? If for example you have the oscillator outputs working but no filtering then perhaps you should start looking at how the filter CV is generated.
> >
> > --
> > Gordon JC Pearce MM0YEQ <gordonjcp@>
> >
>