Discussion about the Korg PolySix synthesizer

... They do call him the Synth Professor, after all! Wow. A highly impressive diagnosis, Dr. Andy! ;-)


--- In PolySix@yahoogroups.com, Andrew Jury <andy@...> wrote:
>
> Vincent,
> 
> Many of the functions which are not working are reliant on the multiplexor
> bus (the two 4051s). Given this you should definitely attempt the, first ,
> the reset procedure (the one with the 56K dummy load) and then, second, the
> D/A convertor before you do anything else. Make sure the controller are set
> as per the diagram at the start of the calibration section of the manual.
> You may find some marked improvements when this is completed!
> 
> Cheers,
> Andy
> 
> 
> On 15/05/2010 02:44, "kluberrrrr" <KLBR@...> wrote:
> 
> >  
> >  
> >  
> >    
> > 
> > HI there!
> > 
> > I'm really you guys crossed my thread!
> > Thanks again to take time to help me!
> > 
> > To Jed and Andy, I will undo the R09 fix tomorrow,  I'd like to start as
> > well the Adjustment Procedure where there is some parts I don't
> > understand at the very beginning of the procedure I should verify the
> > power supply with the test point on the "J" ??? What are the J 's, are
> > they some diodes? or resistances? And then ON the Reset Procedure there
> > is something with a 52Ko resistance but I can't get to understand where
> > i should put the legs on ?
> > and for the MG "Calibration" I really need to use an Oscilloscope but I
> > found there was some software equivalent.  What do you think about them?
> > I'll still look on ebay...
> > 
> > I still did some tests with the buttons and knobs.
> > Here the result:
> > 
> > OUTPUT SECTION
> > 
> > Volume : Ok
> > Output SW : Ok
> > 
> > TUNE SECTION
> > 
> > Tune Knb : not sure
> > 
> > VCO SECTION
> > 
> > Octave : Ok
> > Waveform selection : Ok
> > PW\PWM : hard to say
> > PWM Speed : hard to say too
> > Sub Osc SW : Ok
> > 
> > VCF SECTION
> > 
> > Cutoff : No
> > Resonance : No
> > EG Intensity : No
> > Keyboard Track : No
> > 
> > VCA SECTION
> > 
> > VCA Mode : Ok
> > Attenuation : Ok
> > 
> > ARPEGGIATOR SECTION
> > 
> > Arpeggiator SW on/off  :  Ok
> > Arpeggiator Speed  :  Ok
> > Range SW  :  Ok
> > Mode SW  :  Ok
> > Latch SW  :  Ok
> > 
> > MG SECTION
> > 
> > Freq Diode : Yes but not sync with the Freq Knb
> > Freq : No
> > Delay : No
> > Level : No
> > MG Mode : Ok
> > 
> > EG SECTION
> > 
> > Attack : No
> > Decay : No
> > Sustain : No
> > Release : No
> > 
> > EFFECTS SECTION
> > 
> > (Once again it's hard to say 'cause I hear the notes played only on the
> > "top" of the modulation so it's hard to define phaser ensemble or
> > chorus)
> > 
> > FX Mode : Seems Ok
> > Speed\Intensity : Hard to say
> > 
> > BEND SECTION
> > 
> > Bend Intensity : Ok
> > 
> > WHEELS
> > 
> > Bend Wheel : Ok
> > MG Wheel : Ok
> > 
> > KEY ASSIGN MODE SECTION
> > 
> > Hold : Ok
> > Chord Memory : Ok
> > Unison : Ok
> > Poly : Ok
> > 
> > PROGRAMMER SECTION
> > 
> > All the numbers work when pressed but can't hear the difference
> > 
> > By the way thanks a lot for the Manual Service I found one on a website
> > but yours is best!
> > 
> > Looking forward for your answers
> > 
> > Cheers!
> > 
> > Vincent
> > 
> > PS : ANDY I live in Paris where are you hiding?
> > 
> > --- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com> , Jed
> > Jorgensen <jed.jorgensen@> wrote:
> >> >
> >> > Man, I'm way too impatient this morning. Andy just sent me a complete
> > copy
> >> > of the manual. That is now up on my website. I'm also putting a copy
> > in the
> >> > file section here.
> >> >
> >> > J
> >> >
> >> > On Fri, May 14, 2010 at 9:31 AM, Jed Jorgensen jed.jorgensen@...:
> >> >
> >>> > > Vincent,
> >>> > >
> >>> > > I've put a copy of the service manual on my webpage here:
> >>> > >
> > http://sites.google.com/site/jedjorgensen/klm367a/images/pcb-bugs-errors\
> > /manuals 
> > <http://sites.google.com/site/jedjorgensen/klm367a/images/pcb-bugs-errors/manu
> > als> <https://sites.google.com/site/jedjorgensen/klm367a/images/pcb-b\
> > ugs-errors/manuals
> > <https://sites.google.com/site/jedjorgensen/klm367a/images/pcb-bugs-errors/man
> > uals> >
> >>> > >
> >>> > >
> >>> > >
> > <https://sites.google.com/site/jedjorgensen/klm367a/images/pcb-bugs-erro\
> > rs/manuals 
> > <https://sites.google.com/site/jedjorgensen/klm367a/images/pcb-bugs-errors/man
> > uals> >This
> >>> > > is not a complete copy of the manual, but it has the calibration
> > procedure
> >>> > > that you need to follow. The calibration procedure for the 367 board
> > is on
> >>> > > pages 10 and 11.
> >>> > >
> >>> > > Jed
> >>> > >
> >>> > >
> >>> > > On Fri, May 14, 2010 at 8:45 AM, Jed Jorgensen
> > jed.jorgensen@...:
> >>> > >
> >>>> > >> Hi Vincent,
> >>>> > >>
> >>>> > >> Yes, put R9 back and re-jumper the trace you cut. That modification
> > isn't
> >>>> > >> recommended unless you have LFO noise present that can't be fixed
> > by another
> >>>> > >> method. I've updated my website to make that clear.
> >>>> > >>
> >>>> > >> The calibration procedure on the VR's is necessary to make the
> > board and
> >>>> > >> the P6 function correctly. You can begin parts of the procedure
> > without an
> >>>> > >> oscilloscope, but as Andy noted you have to have one to do the job
> >>>> > >> correctly.
> >>>> > >>
> >>>> > >> Do you have a copy of the service manual? I'll put one on my
> > website soon,
> >>>> > >> but I'm pretty sure it is in the files section at the yahoo groups
> > page.
> >>>> > >>
> >>>> > >> Jed
> >>>> > >>
> >>>> > >> On Fri, May 14, 2010 at 4:22 AM, kluberrrrr KLBR@ wrote:
> >>>> > >>
> >>>>> > >>>
> >>>>> > >>>
> >>>>> > >>> Hi Jed,
> >>>>> > >>>
> >>>>> > >>> first I'd like to thank you for what you did for the P6 itself and
> > of
> >>>>> > >>> course its users! Even if my P6 doesn't work yet I remain positive
> > :)
> >>>>> > >>> I also appreciate you fast answer! thanks!
> >>>>> > >>>
> >>>>> > >>> I fixed the R52 and R98 issues. I was hesitating by doing the last
> > one (
> >>>>> > >>> lift the resistance 9 and cut the trace) I did it : unsoldering
> > one leg of
> >>>>> > >>> the R9 cut the trace and put a jumper between the CN 06 pin 02 and
> > the
> >>>>> > >>> unsoldered leg of the R09.
> >>>>> > >>>
> >>>>> > >>> No more sound at all !Well, I can hear on the background the
> > modulation
> >>>>> > >>> if i put the gain very high of the audio amp. The knobs on the MG
> > panel
> >>>>> > >>> remain unusable
> >>>>> > >>>
> >>>>> > >>> Before to did the fix, I was able to hear the notes played through
> > the
> >>>>> > >>> modulation generator which went in and out very slowly in any MG
> > mod ( vca
> >>>>> > >>> vcf )with a very normal volume. I'm sure that the sound is
> > modulate because
> >>>>> > >>> I can follow the MG led with the fade of the sound
> >>>>> > >>>
> >>>>> > >>> I don't have done the VR adjustments yet because I don't have any
> > access
> >>>>> > >>> to an oscilloscope. But I'm not sure it will change a lot. My
> > first target
> >>>>> > >>> is to have the sound back without the modulation on it .
> >>>>> > >>>
> >>>>> > >>> Should I put the R09 back and remove the jumper? and try something
> > else?
> >>>>> > >>> Or should I try to do the Don B. fix on the 368 board?
> >>>>> > >>>
> >>>>> > >>> Could the problem on my P6 come from another part?
> >>>>> > >>>
> >>>>> > >>> Cheers!
> >>>>> > >>>
> >>>>> > >>> Vincent
> >>>>> > >>>
> >>>>> > >>> --- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com>
> >>>>> <PolySix%40yahoogroups.com>, Jed
> >>>>> > >>> Jorgensen jed.jorgensen@ wrote:
> >>>>>> > >>> >
> >>>>>> > >>> > Hi Vincent,
> >>>>>> > >>> >
> >>>>>> > >>> > Did you fix the two PCB errors noted here (#1 & #3):
> >>>>>> > >>> >
> >>>>> > >>>
> > https://sites.google.com/site/jedjorgensen/klm367a/images/pcb-bugs-error\
> > s <https://sites.google.com/site/jedjorgensen/klm367a/images/pcb-bugs-errors>
> >>>>>> > >>> >
> >>>>>> > >>> > <
> >>>>> > >>>
> > https://sites.google.com/site/jedjorgensen/klm367a/images/pcb-bugs-error\
> > s <https://sites.google.com/site/jedjorgensen/klm367a/images/pcb-bugs-errors>
> >>>>>> > >>> >Also,
> >>>>>> > >>> > did you calibrate the board following the build as per the
> > service
> >>>>> > >>> manual?
> >>>>>> > >>> >
> >>>>>> > >>> > Jed
> >>>>>> > >>> >
> >>>>>> > >>> > On Thu, May 13, 2010 at 3:07 PM, kluberrrrr KLBR@ wrote:
> >>>>>> > >>> >
> >>>>>>> > >>> > >
> >>>>>>> > >>> > >
> >>>>>>> > >>> > > Hi everybody,
> >>>>>>> > >>> > >
> >>>>>>> > >>> > > I'm quite desperate here, so I hope someone could help me a
> > bit
> >>>>> > >>> especially
> >>>>>>> > >>> > > because I'm not very good in English and I'm not an electronic
> > guy!
> >>>>>>> > >>> > > A couple of years ago I found a polysix which had the famous
> > leak
> >>>>> > >>> battery
> >>>>>>> > >>> > > problem, so impossible to play on it.
> >>>>>>> > >>> > >
> >>>>>>> > >>> > > I tried to repair the KLM 367 but with no success.
> >>>>>>> > >>> > > Then i discovered the Jed's project
> >>>>>>> > >>> > >
> >>>>>>> > >>> > > Today I've just finished to solder all the parts on the
> > KLM-367A
> >>>>> > >>> clone
> >>>>>>> > >>> > > board.
> >>>>>>> > >>> > > I put the board back on my P6. Then I turned it on.
> >>>>>>> > >>> > >
> >>>>>>> > >>> > > First, the programmer panel seems to work fine, Led button
> > repond
> >>>>> > >>> when I
> >>>>>>> > >>> > > push them
> >>>>>>> > >>> > >
> >>>>>>> > >>> > > BUT there is no sound at all. Just some attack sound, some
> > 'blops'.
> >>>>>>> > >>> > >
> >>>>>>> > >>> > > When I hold a key down, I can hear the note coming very slowly
> > and
> >>>>> > >>> fade
> >>>>>>> > >>> > > out. Just like the LEd of the MG panel fading In and Out very
> > slowly.
> >>>>>>> > >>> > >
> >>>>>>> > >>> > > The Mg frequency, delay and level's knobs don't affect the
> >>>>> > >>> modulation. Even
> >>>>>>> > >>> > > if the modulation level is at 0, the sound is fully modulated
> >>>>>>> > >>> > >
> >>>>>>> > >>> > > So I guess it's the MG section which seems to not work
> > properly. It
> >>>>> > >>> looks
> >>>>>>> > >>> > > like it is stuck on a very slow frequency and there is no way
> > to cut
> >>>>> > >>> the
> >>>>>>> > >>> > > modulation.
> >>>>>>> > >>> > >
> >>>>>>> > >>> > >
> >>>>>>> > >>> > > Also cutoff, resonance, eg int, keyboard track knobs don't
> > seem to
> >>>>> > >>> change
> >>>>>>> > >>> > > the sound.
> >>>>>>> > >>> > >
> >>>>>>> > >>> > > When I built the new Jed's PCB, I used from the old board the
> > mask
> >>>>> > >>> rom IC,
> >>>>>>> > >>> > > the TC5514APL-3 IC, the two LM13600 ICs and the 2SA798
> >>>>>>> > >>> > >
> >>>>>>> > >>> > > What do you think? Is it possible that one of the Ic is dead?
> > Or does
> >>>>> > >>> it
> >>>>>>> > >>> > > look like the problem is deeper?
> >>>>>>> > >>> > >
> >>>>>>> > >>> > > Please excuse my poor english !
> >>>>>>> > >>> > >
> >>>>>>> > >>> > > Cheers!
> >>>>>>> > >>> > >
> >>>>>>> > >>> > > Vincent
> >>>>>>> > >>> > >
> >>>>>>> > >>> > >
> >>>>>>> > >>> > >
> >>>>>> > >>> >
> >>>>>> > >>> >
> >>>>>> > >>> > [Non-text portions of this message have been removed]
> >>>>>> > >>> >
> >>>>> > >>>
> >>>>> > >>>
> >>>>> > >>>
> >>>> > >>
> >>>> > >>
> >>> > >
> >> >
> >> >
> >> > [Non-text portions of this message have been removed]
> >> >
> > 
> > [Non-text portions of this message have been removed]
> > 
> >  
> >    
> > 
> > 
> 
> 
> 
> [Non-text portions of this message have been removed]
>