Discussion about the Korg PolySix synthesizer

Do you want a recorded sample to hear what is the state of my P6 for the moment?

--- In PolySix@yahoogroups.com, "kluberrrrr" <KLBR@...> wrote:
>
> Hey,
> 
> Thanks everybody for your explanations
> 
> So I did check the battery Voltage ( in the service manual they said it should be between 3.6V and 4.10) my multimeter gives me 3.0V but since the battery is no more the same it's correct.
> I checked the  power supply, every VR have been verified.
> I put a 56K on the 2pin connector of the KLM-376  board (should I use an 1/4W or 1W  resistance?) then I turned the VR1 on the KLM-367...but nothing happened.
> Bank A, Program 1 and Tape Enable are lighting on with or without the 56K connector. whatever how i turn to the clockwise or the counterclockwise theLEDs remain the same.
> 
> When I turn the power on ( without the 2pin 56K) I noticed the Tape LED is always lit. if I switch to enable the LED turns brighter...
> 
> Should I continue the procedure with D/A adjustment?
> 
> 
> PS : I noticed something weird when I press a key six time in a row the D10 on the unit 4 and the unit 5 don't light. Does it mean 2 voices are kind of broken? 
> 
>  Cheers!
> 
> 
> Vincent
> 
> --- In PolySix@yahoogroups.com, Jed Jorgensen <jed.jorgensen@> wrote:
> >
> > Hi Vincent,
> > 
> > What Paul said is correct. You can also use the "Test Points" (known as
> > "TP'x'") which are little brass hooks with a yellow bead at the bottom. The
> > first part of the adjustment procedure is on the KLM-376 PCB, the power
> > supply at the back of the unit. With this procedure you are checking to make
> > sure the voltages coming off the power supply are correct. Take care in
> > doing this. If you are unsure about what you are doing, keep one hand in
> > your back pocket. It is a little harder to electrocute yourself that way.
> > 
> > To make the dummy plug for the reset procedure (56k resistor thing) see if
> > you can find an old computer mother board and take off a small connector.
> > The audio connectors should fit perfectly. You'll solder a 56k resistor
> > across the wires.
> > 
> > As far as the oscilloscope goes, ask around where you live. I've borrowed
> > one from my co-worker's boyfriend for about 9 months. No need to buy
> > something that you aren't going to use a lot. I'm sure you can find one
> > where you live.
> > 
> > Above all...GO SLOW AND BE CAREFUL!!!! Make sure you understand what it is
> > that you are trying to do...BEFORE you do it. Remember, you are working in a
> > circuit that has electricity applied to it. This is dangerous if you don't
> > know how to be careful.
> > 
> > Also know this: this is an extremely challenging project if you have not
> > worked on electronic circuits before. It is a good idea to find someone
> > where you live who can help you!
> > 
> > Jed
> > 
> > 
> > 
> > On Fri, May 14, 2010 at 6:52 PM, Paul T <sharpfish@> wrote:
> > 
> > >
> > > there is a blank white plastic 2 pinned connector just below a capacitor
> > > and near a VR on the rear panel mounted power board (for the 52k load) - the
> > > j1/2/7 etc are the component style 'jumpers' on this board - you put your
> > > multimeter probe against the legs of them and get the reading from there -
> > > they are marked on the board as J1/2/7 etc. I did mine just the other day as
> > > it happens.
> > > HTHPaul
> > >
> > > To: PolySix@yahoogroups.com
> > > From: KLBR@
> > > Date: Sat, 15 May 2010 01:44:38 +0000
> > > Subject: [PolySix] Re: MG section problem
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >      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, 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<https://sites.google.com/site/jedjorgensen/klm367a/images/pcb-b\
> > >
> > > ugs-errors/manuals>
> > >
> > > > >
> > >
> > > > >
> > >
> > > > >
> > >
> > > <https://sites.google.com/site/jedjorgensen/klm367a/images/pcb-bugs-erro\
> > >
> > > rs/manuals>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 <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-error\
> > >
> > > s
> > >
> > > > >>> >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
> > >
> > > > >>> > >
> > >
> > > > >>> > >
> > >
> > > > >>> > >
> > >
> > > > >>> >
> > >
> > > > >>> >
> > >
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> > >
> > >
> > >
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> > >
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> > > Links
> > >
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