Discussion about the Korg PolySix synthesizer

Hello everyone. I hope someone here can push me in the right direction.
I have a p6 with the battery leak problem.

-When i opened up the unit the battery had already been removed but i managed to solder new wires on all the bad connections on the 367board. (at least as far as i know:)
I only have 1 bank LED lit up when i turn on the unit with tape disabled, so far so good...

-I havent put in a new battery yet, so of course the p6 cannot save data BUT! - I'm still having the following problems:
-Octave switch doesnt work
-Waveform switch doesnt work
-PW/PWM is just behaving plain weird - seems like the calibration is off somehow - i cant hear any osc when i turn the pot to 8-10 positions.

-Sub osc switch doesnt work.
All other things are working fine - so it seems that the problem is just connected to one area..


I actually have another P6 with battery leak problem too, but i havent repaired that board.. it works about 60%....
-I did try just for the heck of it to connect the unrepaired board, and i had the same problems except the waveform and sub osc did work (sub osc worked in "off" and in "2 oct" position, all other things in the same area (oct switch etc didnt work) - so it doesnt seem that the board with the pots is damaged, but something else in the signalpath, since it at least is working differently with 2 boards connected..

-Could someone give me any hints?

thanks!:)

It seems like you have not fixed every damaged/broken connection.
Note that battery leakage can cause problems other places on the board
as well, just not close to the battery.
The symtoms you describe are typical of broken PCB traces.

Terje


Den 9. mai. 2012 kl. 22.07 skrev abcceihgfosdjgooenje:

> Hello everyone. I hope someone here can push me in the right
> direction.
> I have a p6 with the battery leak problem.
>
> -When i opened up the unit the battery had already been removed but
> i managed to solder new wires on all the bad connections on the
> 367board. (at least as far as i know:)
> I only have 1 bank LED lit up when i turn on the unit with tape
> disabled, so far so good...
>
> -I havent put in a new battery yet, so of course the p6 cannot save
> data BUT! - I'm still having the following problems:
> -Octave switch doesnt work
> -Waveform switch doesnt work
> -PW/PWM is just behaving plain weird - seems like the calibration is
> off somehow - i cant hear any osc when i turn the pot to 8-10
> positions.
>
> -Sub osc switch doesnt work.
> All other things are working fine - so it seems that the problem is
> just connected to one area..
>
> I actually have another P6 with battery leak problem too, but i
> havent repaired that board.. it works about 60%....
> -I did try just for the heck of it to connect the unrepaired board,
> and i had the same problems except the waveform and sub osc did work
> (sub osc worked in "off" and in "2 oct" position, all other things
> in the same area (oct switch etc didnt work) - so it doesnt seem
> that the board with the pots is damaged, but something else in the
> signalpath, since it at least is working differently with 2 boards
> connected..
>
> -Could someone give me any hints?
>
> thanks!:)
>
>

Terje Winther
terje.winther@wintherstormer.no
http://www.wintherstormer.no/






[Non-text portions of this message have been removed]

Check the traces originating from CN06 on the KLM367 board.

BTW, the PW pot is probably just fine. If the waveform is set to PW (which
it might well be since the switch doesn't work) the sound will stop at
about 8 or so because at this point the pulse is getting too narrow.

Check also if the MOD switch for the LFO works.

Also, the octave and waveform switches and the PW/PWM level are all sent
through IC28 (14042) so check down around there for damage. This chip might
need to be replaced.



Don B.



_____

From: PolySix@yahoogroups.com [mailto:PolySix@yahoogroups.com] On Behalf Of
Malte Rogacki
Sent: Thursday, May 10, 2012 2:31 AM
To: PolySix@yahoogroups.com
Subject: Re: [PolySix] Yet another battery leak victim..





Check the traces originating from CN06 on the KLM367 board.

BTW, the PW pot is probably just fine. If the waveform is set to PW (which
it might well be since the switch doesn't work) the sound will stop at
about 8 or so because at this point the pulse is getting too narrow.

Check also if the MOD switch for the LFO works.





[Non-text portions of this message have been removed]

It works! It Works!! Thanks alot for everyone's suggestions! (turned out I had missed a solder trace).
On to repair the next polysix - i'll be back;)

Sendt fra min iPhone

Den 10/05/2012 kl. 16.13 skrev "backshall1" <backshall1@bellsouth.net>:

> Also, the octave and waveform switches and the PW/PWM level are all sent
> through IC28 (14042) so check down around there for damage. This chip might
> need to be replaced.
>
> Don B.
>
> _____
>
> From: PolySix@yahoogroups.com [mailto:PolySix@yahoogroups.com] On Behalf Of
> Malte Rogacki
> Sent: Thursday, May 10, 2012 2:31 AM
> To: PolySix@yahoogroups.com
> Subject: Re: [PolySix] Yet another battery leak victim..
>
> Check the traces originating from CN06 on the KLM367 board.
>
> BTW, the PW pot is probably just fine. If the waveform is set to PW (which
> it might well be since the switch doesn't work) the sound will stop at
> about 8 or so because at this point the pulse is getting too narrow.
>
> Check also if the MOD switch for the LFO works.
>
> [Non-text portions of this message have been removed]
>
>

[Non-text portions of this message have been removed]

By the Way, about the pw. I'm not sure I understood correctly, but is it normal that when I turn it to about 8, the wave will go away and I will get no sound from the osc? I just haven't seen that on any other synths..
Thanks!

Sendt fra min iPhone

Den 10/05/2012 kl. 08.31 skrev Malte Rogacki <gacki@gacki.sax.de>:

> Check the traces originating from CN06 on the KLM367 board.
>
> BTW, the PW pot is probably just fine. If the waveform is set to PW (which
> it might well be since the switch doesn't work) the sound will stop at
> about 8 or so because at this point the pulse is getting too narrow.
>
> Check also if the MOD switch for the LFO works.
>
>

[Non-text portions of this message have been removed]

I'm not with my Polysix right now, but I'm pretty sure it shouldn't go
silent (the pulse becomes so thin it creates no harmonics) until you get to
the clock-wise end of the pot (i.e. 10). Have you calibrated your Polysix
since making the repair? Can you put the audio output of the square wave
(Pulse) on an oscilloscope and see if you're getting an actual *square* square
wave (i.e. 50% duty cycle) when the potentiometer is set all the way
counter-clockwise (i.e. set to 0)?

James

On Fri, May 11, 2012 at 12:52 AM, Troels J�rgensen <the19thbear@gmail.com>wrote:

> **
>
>
> By the Way, about the pw. I'm not sure I understood correctly, but is it
> normal that when I turn it to about 8, the wave will go away and I will get
> no sound from the osc? I just haven't seen that on any other synths..
> Thanks!
>
> Sendt fra min iPhone
>
> Den 10/05/2012 kl. 08.31 skrev Malte Rogacki <gacki@gacki.sax.de>:
>
>
> > Check the traces originating from CN06 on the KLM367 board.
> >
> > BTW, the PW pot is probably just fine. If the waveform is set to PW
> (which
> > it might well be since the switch doesn't work) the sound will stop at
> > about 8 or so because at this point the pulse is getting too narrow.
> >
> > Check also if the MOD switch for the LFO works.
> >
> >
>
> [Non-text portions of this message have been removed]
>
>
>



--
C'est La Guerre Moving Pictures Inc.
364 Home Street
Winnipeg, Manitoba
R3G 1X4
(204) 918 9317


[Non-text portions of this message have been removed]

At 7:52 Uhr +0200 11.05.2012, Troels Jørgensen wrote:

> By the Way, about the pw. I'm not sure I understood correctly, but is it
> normal that when I turn it to about 8, the wave will go away and I will
>get no
> sound from the osc? I just haven't seen that on any other synths..

Yes, it's normal and the way it is supposed to be.

From the User Manual:

"At 8 or above the pulse width becomes so narrow as to collapse, which
produces sound and in effect shuts off the VCOs."

Of course this should probably read "no sound" because otherwise it
wouldn't make much sense, would it?


--
Malte Rogacki gacki@gacki.sax.de
----------------------------------------------------------------------------
"Don't forget to TURN ON THE SYNTHESIZER. Often this is the reason why you
get no sound out of it." (ARP 2600 Owner's Manual)
----------------------------------------------------------------------------

Just calibrate it the way you want it.
If you want to be able to mod the PW so much that the wave will not be audible, do that.
If you don't, then calibrate it so you always have a very narrow pulse at least.
As long as it works, tweak it the way you want it :)
Nice work with the repair!

BR,
Peter

----- Original Message -----
From: Malte Rogacki
To: PolySix@yahoogroups.com
Sent: Friday, May 11, 2012 3:51 PM
Subject: Re: [PolySix] Yet another battery leak victim..



At 7:52 Uhr +0200 11.05.2012, Troels Jørgensen wrote:
> By the Way, about the pw. I'm not sure I understood correctly, but is it
> normal that when I turn it to about 8, the wave will go away and I will
>get no
> sound from the osc? I just haven't seen that on any other synths..

Yes, it's normal and the way it is supposed to be.

From the User Manual:

"At 8 or above the pulse width becomes so narrow as to collapse, which
produces sound and in effect shuts off the VCOs."

Of course this should probably read "no sound" because otherwise it
wouldn't make much sense, would it?

--
Malte Rogacki gacki@gacki.sax.de
----------------------------------------------------------
"Don't forget to TURN ON THE SYNTHESIZER. Often this is the reason why you
get no sound out of it." (ARP 2600 Owner's Manual)
----------------------------------------------------------




[Non-text portions of this message have been removed]

Well well.. Here we go again with the next polysix.. It has the same problems as the earlier one:
-sub osc doesn't work(one of the octaves actually works)
-octave doesn't work
-waveform switch doesn't work
-Pwm doesn't work.
-Modulation to vcf/vco doesn't work.

And also: the effect section is always on in one setting
in the near future I'm sure I'll fix it..and one of the osc is always hanging. The LED is constantly lit. Might be a problem with the keyboard though..

But the weirdest part:
When I the the attenuator/gain pot the presets switch back and forth!?!?
Does this indicate a broken CPU? Because if it is broken then I suspect it's not worth repairing the rest of the synth..
Pretty big project, eh?!:)
Sendt fra min iPhone

Den 11/05/2012 kl. 22.25 skrev Peter Mörck <peterm@sunsetselection.com>:

> Just calibrate it the way you want it.
> If you want to be able to mod the PW so much that the wave will not be audible, do that.
> If you don't, then calibrate it so you always have a very narrow pulse at least.
> As long as it works, tweak it the way you want it :)
> Nice work with the repair!
>
> BR,
> Peter
>
> ----- Original Message -----
> From: Malte Rogacki
> To: PolySix@yahoogroups.com
> Sent: Friday, May 11, 2012 3:51 PM
> Subject: Re: [PolySix] Yet another battery leak victim..
>
> At 7:52 Uhr +0200 11.05.2012, Troels Jørgensen wrote:
> > By the Way, about the pw. I'm not sure I understood correctly, but is it
> > normal that when I turn it to about 8, the wave will go away and I will
> >get no
> > sound from the osc? I just haven't seen that on any other synths..
>
> Yes, it's normal and the way it is supposed to be.
>
> From the User Manual:
>
> "At 8 or above the pulse width becomes so narrow as to collapse, which
> produces sound and in effect shuts off the VCOs."
>
> Of course this should probably read "no sound" because otherwise it
> wouldn't make much sense, would it?
>
> --
> Malte Rogacki gacki@gacki.sax.de
> ----------------------------------------------------------
> "Don't forget to TURN ON THE SYNTHESIZER. Often this is the reason why you
> get no sound out of it." (ARP 2600 Owner's Manual)
> ----------------------------------------------------------
>
> [Non-text portions of this message have been removed]
>
>

[Non-text portions of this message have been removed]

And: how can I check if the 74L chips near the CPU/leak are still ok? Im not sure I can measure that with a normal voltmeter..

Sendt fra min iPhone

Den 11/05/2012 kl. 22.25 skrev Peter Mörck <peterm@sunsetselection.com>:

> Just calibrate it the way you want it.
> If you want to be able to mod the PW so much that the wave will not be audible, do that.
> If you don't, then calibrate it so you always have a very narrow pulse at least.
> As long as it works, tweak it the way you want it :)
> Nice work with the repair!
>
> BR,
> Peter
>
> ----- Original Message -----
> From: Malte Rogacki
> To: PolySix@yahoogroups.com
> Sent: Friday, May 11, 2012 3:51 PM
> Subject: Re: [PolySix] Yet another battery leak victim..
>
> At 7:52 Uhr +0200 11.05.2012, Troels Jørgensen wrote:
> > By the Way, about the pw. I'm not sure I understood correctly, but is it
> > normal that when I turn it to about 8, the wave will go away and I will
> >get no
> > sound from the osc? I just haven't seen that on any other synths..
>
> Yes, it's normal and the way it is supposed to be.
>
> From the User Manual:
>
> "At 8 or above the pulse width becomes so narrow as to collapse, which
> produces sound and in effect shuts off the VCOs."
>
> Of course this should probably read "no sound" because otherwise it
> wouldn't make much sense, would it?
>
> --
> Malte Rogacki gacki@gacki.sax.de
> ----------------------------------------------------------
> "Don't forget to TURN ON THE SYNTHESIZER. Often this is the reason why you
> get no sound out of it." (ARP 2600 Owner's Manual)
> ----------------------------------------------------------
>
> [Non-text portions of this message have been removed]
>
>

[Non-text portions of this message have been removed]

Hmm seems like i got a bit further. It seems to be a problem with ic28 (and probably 29). Cause whenever I desolder ic28 the octave switch works... Off to the electronics shop Monday!!
:)

Sendt fra min iPhone

Den 11/05/2012 kl. 22.25 skrev Peter Mörck <peterm@sunsetselection.com>:

> Just calibrate it the way you want it.
> If you want to be able to mod the PW so much that the wave will not be audible, do that.
> If you don't, then calibrate it so you always have a very narrow pulse at least.
> As long as it works, tweak it the way you want it :)
> Nice work with the repair!
>
> BR,
> Peter
>
> ----- Original Message -----
> From: Malte Rogacki
> To: PolySix@yahoogroups.com
> Sent: Friday, May 11, 2012 3:51 PM
> Subject: Re: [PolySix] Yet another battery leak victim..
>
> At 7:52 Uhr +0200 11.05.2012, Troels Jørgensen wrote:
> > By the Way, about the pw. I'm not sure I understood correctly, but is it
> > normal that when I turn it to about 8, the wave will go away and I will
> >get no
> > sound from the osc? I just haven't seen that on any other synths..
>
> Yes, it's normal and the way it is supposed to be.
>
> From the User Manual:
>
> "At 8 or above the pulse width becomes so narrow as to collapse, which
> produces sound and in effect shuts off the VCOs."
>
> Of course this should probably read "no sound" because otherwise it
> wouldn't make much sense, would it?
>
> --
> Malte Rogacki gacki@gacki.sax.de
> ----------------------------------------------------------
> "Don't forget to TURN ON THE SYNTHESIZER. Often this is the reason why you
> get no sound out of it." (ARP 2600 Owner's Manual)
> ----------------------------------------------------------
>
> [Non-text portions of this message have been removed]
>
>

[Non-text portions of this message have been removed]

Sorry, but I'm not that much into electronics.. I'm trying to find ic 28(14042) in the local electronics store and they didn't have it..So I'll have to order it instead. Is it this I need?:
http://dk.farnell.com/on-semiconductor/mc14042bcpg/ic-4000-cmos-4042-dip16-15v/dp/9664637

Thanks!

Sendt fra min iPhone

Den 11/05/2012 kl. 22.25 skrev Peter Mörck <peterm@sunsetselection.com>:

> Just calibrate it the way you want it.
> If you want to be able to mod the PW so much that the wave will not be audible, do that.
> If you don't, then calibrate it so you always have a very narrow pulse at least.
> As long as it works, tweak it the way you want it :)
> Nice work with the repair!
>
> BR,
> Peter
>
> ----- Original Message -----
> From: Malte Rogacki
> To: PolySix@yahoogroups.com
> Sent: Friday, May 11, 2012 3:51 PM
> Subject: Re: [PolySix] Yet another battery leak victim..
>
> At 7:52 Uhr +0200 11.05.2012, Troels Jørgensen wrote:
> > By the Way, about the pw. I'm not sure I understood correctly, but is it
> > normal that when I turn it to about 8, the wave will go away and I will
> >get no
> > sound from the osc? I just haven't seen that on any other synths..
>
> Yes, it's normal and the way it is supposed to be.
>
> From the User Manual:
>
> "At 8 or above the pulse width becomes so narrow as to collapse, which
> produces sound and in effect shuts off the VCOs."
>
> Of course this should probably read "no sound" because otherwise it
> wouldn't make much sense, would it?
>
> --
> Malte Rogacki gacki@gacki.sax.de
> ----------------------------------------------------------
> "Don't forget to TURN ON THE SYNTHESIZER. Often this is the reason why you
> get no sound out of it." (ARP 2600 Owner's Manual)
> ----------------------------------------------------------
>
> [Non-text portions of this message have been removed]
>
>

[Non-text portions of this message have been removed]

I have to help a fellow Jorgensen! There's not so many of us!

Here's the part that Andy recommends:
http://nl.farnell.com/texas-instruments/cd4042be/latch/dp/1470893

Jed

On Mon, May 14, 2012 at 7:34 AM, Troels J�rgensen <the19thbear@gmail.com>wrote:

> **
>
>
> Sorry, but I'm not that much into electronics.. I'm trying to find ic
> 28(14042) in the local electronics store and they didn't have it..So I'll
> have to order it instead. Is it this I need?:
>
> http://dk.farnell.com/on-semiconductor/mc14042bcpg/ic-4000-cmos-4042-dip16-15v/dp/9664637
>
>
> Thanks!
>
> Sendt fra min iPhone
>
> Den 11/05/2012 kl. 22.25 skrev Peter M�rck <peterm@sunsetselection.com>:
>
> > Just calibrate it the way you want it.
> > If you want to be able to mod the PW so much that the wave will not be
> audible, do that.
> > If you don't, then calibrate it so you always have a very narrow pulse
> at least.
> > As long as it works, tweak it the way you want it :)
> > Nice work with the repair!
> >
> > BR,
> > Peter
> >
> > ----- Original Message -----
> > From: Malte Rogacki
> > To: PolySix@yahoogroups.com
> > Sent: Friday, May 11, 2012 3:51 PM
> > Subject: Re: [PolySix] Yet another battery leak victim..
> >
> > At 7:52 Uhr +0200 11.05.2012, Troels J�rgensen wrote:
> > > By the Way, about the pw. I'm not sure I understood correctly, but is
> it
> > > normal that when I turn it to about 8, the wave will go away and I will
> > >get no
> > > sound from the osc? I just haven't seen that on any other synths..
> >
> > Yes, it's normal and the way it is supposed to be.
> >
> > From the User Manual:
> >
> > "At 8 or above the pulse width becomes so narrow as to collapse, which
> > produces sound and in effect shuts off the VCOs."
> >
> > Of course this should probably read "no sound" because otherwise it
> > wouldn't make much sense, would it?
> >
> > --
> > Malte Rogacki gacki@gacki.sax.de
> > ----------------------------------------------------------
> > "Don't forget to TURN ON THE SYNTHESIZER. Often this is the reason why
> you
> > get no sound out of it." (ARP 2600 Owner's Manual)
> > ----------------------------------------------------------
> >
> > [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]

Thanks alot!!:) Where are you from fellow Jorgensen?


[Non-text portions of this message have been removed]

Hmmm... I just cant seem to get this board working no matter what i do.
When i turn the polysix i get 2 programs lighting - suggesting an error
with the data somehow.
I changed IC39, 30 and ic28 and still cant shift octaves, do PWM, change
waveform etc.
And whenever i turn the attenuator pot (stepped) the polysix starts
changing presets and acting even more weird. Its like there is a huge short
somewhere.
-I checked for signal from CN06 to IC 28 and its all there, and then on to
IC31 is also perfect (havent checked IC30. Ic 26 also seems to have the
rigth connections at least on the input side - to IC 28. So could it be
IC32? How can i check if it is outputting any right signals? And how do i
check the ouput of IC26?

thanks!!!!!
:)


[Non-text portions of this message have been removed]