Discussion about the Korg PolySix synthesizer

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@gmail.com>wrote:

> 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-bugs-errors/manuals>
>
>
> <https://sites.google.com/site/jedjorgensen/klm367a/images/pcb-bugs-errors/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@gmail.com>wrote:
>
>> 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@free.fr> 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-errors
>>> >
>>> > <
>>> 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]
>>> >
>>>
>>>  
>>>
>>
>>
>


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