Re: [PolySix] Re: Noisy Polysix
2015-09-04 by <backshall1@bellsouth.net>
It looks like IC18 on the 366B is a TL072 (8-pin chip) in the tuning circuit. He was definitely talking about the 367 board, where IC18 is the 14051
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Re: [PolySix] Re: Noisy Polysix
2015-09-04 by cliofreak@yahoo.com
Just repaired pin 11...fingers crossed...
Re: [PolySix] Re: Noisy Polysix
2015-09-04 by Eoin O'Callaghan
Thanks, well IC18 on the 367 board is fine on pin 11 and the others, however IC18 on 366 is not fine. In fact a bunch of previous re-tracing has been done on
Re: [PolySix] Re: Noisy Polysix
2015-09-04 by <backshall1@bellsouth.net>
Sorry, the KLM-367 (the programmer board) is commonly called the “digital” board since it has the A/D circuit, memory and D/A chip and the KLM-366 is the
Re: [PolySix] Re: Noisy Polysix
2015-09-04 by cliofreak@yahoo.com
Anyone know where to find IC18 in question. Ive the whole thing opened up and all I can see are 8 pin IC 18s so can t check pin 11
Re: [PolySix] Re: Noisy Polysix
2015-09-04 by Eoin O'Callaghan
366B I guess...
Re: [PolySix] Re: Noisy Polysix
2015-09-04 by Eoin O'Callaghan
hey, Im trying to find the digital board but eveything is KLM... etc
Re: [PolySix] Re: Noisy Polysix
2015-09-04 by synthmans@gmail.com
That s what my synth was doing before I repaired the bad connection I d mentioned.... it would kick in intermittently with all kinds of strange noise
Re: [PolySix] Re: Noisy Polysix
2015-09-04 by Malte Rogacki
If it s the same pattern every 8 notes I d suspect interference from the key assigner. I believe Dan Backshall already suggested checking the keyboard cable.
Re: [PolySix] Re: Noisy Polysix
2015-09-04 by Eoin O'Callaghan
HI, there is actually a pattern every 8 notes chromatically. Every 8 notes create the same frequency but indeed, it does alway jump back to the same hands off
Re: [PolySix] Re: Noisy Polysix
2015-09-04 by Malte Rogacki
A complete shot in the dark here: When watching the video it appeared to me as if the problem was not audible for some patches (around 1:30 for example). This
Re: [PolySix] Re: Noisy Polysix
2015-09-04 by synthmans@gmail.com
Yeah, those keyboard wires are like antennas carrying dirty digital key scanning signals that can radiate into the analog electronics... if you ve ever
Re: [PolySix] Re: Noisy Polysix
2015-09-04 by <backshall1@bellsouth.net>
Do you have the keyboard cables tied up away from the circuit board? They are supposed to be nicely bundled and attached to the back of the metal keybed to
Re: [PolySix] Re: Noisy Polysix
2015-09-04 by Eoin O'Callaghan
Thanks! I ll have a look at that area and consider all that you said re dullness vs continuity etc. Not giving in just yet.
Re: [PolySix] Re: Noisy Polysix
2015-09-04 by synthmans@gmail.com
You can choose to go with a replacement, either the Kiwi upgrade or a clone pcb requiring all the related transfer of old components and addition of
Re: [PolySix] Re: Noisy Polysix
2015-09-03 by Eoin O'Callaghan
Yeah, cleaned the ground around the edge with a fibreglass pen and added solder to places that looked like it might need reinforcing. Ground is solid from the
Re: [PolySix] Re: Noisy Polysix
2015-09-03 by Eoin O'Callaghan
Ok thanks, Ill give that a go Ok thanks, Ill give that a go
Re: [PolySix] Re: Noisy Polysix
2015-09-03 by Florian Anwander
Am 02.09.2015 um 17:48 schrieb Eoin O Callaghan cliofreak@yahoo.com ... Showing continuity and working satisfying as ground that can catchup noise signals are
Re: Noisy Polysix
2015-09-03 by cliofreak@yahoo.com
So I changed the IC and its all still the same. Exactly the same. Im now considering the KIWISIX but its expensive.
Re: [PolySix] Re: Noisy Polysix [2 Attachments]
2015-09-02 by Eoin O'Callaghan
The traces have been repaired. That big thick ground trace is showing continuity. I think its fine. I could be wrong but its showing continuity from main
Re: [PolySix] Re: Noisy Polysix [2 Attachments]
2015-09-02 by Florian Anwander
Am 02.09.2015 um 16:59 schrieb Eoin O Callaghan cliofreak@yahoo.com ... Ok, you did replace the battery but you did not repair the traces. This has to be done
Re: [PolySix] Re: Noisy Polysix [2 Attachments]
2015-09-02 by Eoin O'Callaghan
Here it is right now...
Re: Noisy Polysix
2015-09-02 by cliofreak@yahoo.com
Hi, yes it is showing a pattern every 8 notes chromatically
Re: Noisy Polysix
2015-09-02 by cliofreak@yahoo.com
Hi yes it is a patten everry 8 notes chromatically
Re: [PolySix] Re: Noisy Polysix [2 Attachments]
2015-09-02 by Florian Anwander
Now seeing your photos: repair all the ground traces around the battery. These look extremely ugly.
Re: [PolySix] Noisy Polysix
2015-09-02 by Florian Anwander
Hi Appearently this is a frequency depending on the pressed keys. I am quite sure, it will show a kind of tonal pattern each eight keys. Check also, whether
Re: Noisy Polysix
2015-09-02 by cliofreak@yahoo.com
Noisy Polysix
2015-09-02 by cliofreak@yahoo.com
HI people! I have a Polysix with an annoying noise. It can be seen in this video. I was sold the synth and told the battery had been done. I looked anyway and
Re: [PolySix] VCOs slightly modulated due to battery board malfunction
2015-08-10 by klosmon
Next step is to begin eliminating possible causes. Lift the end of R11 to see if the effect goes away. Then lift R9. R11 carries the internal mod signal;
Re: [PolySix] VCOs slightly modulated due to battery board malfunction
2015-08-10 by moogchild synthdrome
Definetely not, I ve double checked it. Effects off, sawtooth wave. Same slow VCOs modulation (about 5 secs per cycle) independently of the speed of the three
Re: [PolySix] VCOs slightly modulated due to battery board malfunction
2015-08-10 by <backshall1@bellsouth.net>
How about PWM Speed or Effects Speed? They also have their own LFO signal that could be bleeding in somewhere. Don B. From: mailto:PolySix@yahoogroups.com
Re: [PolySix] VCOs slightly modulated due to battery board malfunction
2015-08-10 by moogchild synthdrome
No, it isn t related with the speed of the MG. Once I repaired another KLM-367A board which produced a high speed modulation in the sound, I replaced IC30 and
Re: [PolySix] VCOs slightly modulated due to battery board malfunction
2015-08-10 by <backshall1@bellsouth.net>
Does it change with the MG speed control or does it seem unrelated to the MG? Don B. From: mailto:PolySix@yahoogroups.com Sent: Monday, August 10, 2015 2:15 PM
VCOs slightly modulated due to battery board malfunction
2015-08-10 by moogchild synthdrome
Hi again. This time I have a Polysix whose VCOs are always modulated by a very slow sine or triangle wave. Of course all modulation controls in the panel and
Re: NoisySix - An analog hardware upgrade for the Polysix. White/Pink Noise + 6-waveshape LFO (+S&H)
2015-08-09 by enoughstatic@yahoo.com
David, Thank you! I probably did not implement an exact scheme for cross-modulation as such. I will play around with it this coming week and see if I can come
Re: NoisySix - An analog hardware upgrade for the Polysix. White/Pink Noise + 6-waveshape LFO (+S&H)
2015-08-09 by feline1@feline1.co.uk
this looks and sounds very nice, and the layout of the new knobs looks good too! One thing it would be nice to hear in the demos though is modulating the
Re: [PolySix] Effects not working due to problem in battery board
2015-08-08 by Malte Rogacki
I d first check continuity to the connector that goes to the effects board. Those traces are often affected by the acid damage. I ve had at least one board
NoisySix - An analog hardware upgrade for the Polysix. White/Pink Noise + 6-waveshape LFO (+S&H)
2015-08-07 by enoughstatic@yahoo.com
Hello! I have a new hardware (analog) upgrade called the NoisySix . I designed and built the kits here in the U.S. It is for the Korg Polysix synth!
New NOISYSIX upgrade for the Polysix (Pink/White Noise + 6-waveshape LFO)
2015-08-07 by enoughstatic@yahoo.com
I don t think I ve posted this here in the Yahoo Polysix group yet, but I have designed and built a kit for the Polysix called NoisySix, which I now have more
Re: [PolySix] Effects not working due to problem in battery board
2015-08-07 by moogchild synthdrome
I ve found a broken trace near to IC33 I didn t notice before as it was almost imperceptible. Now the effects are working!. Thank you for your help! ... El
Re: [PolySix] Effects not working due to problem in battery board
2015-08-07 by Terje Winther
IC34 and IC35. It could be that the 4042 chips are broken (very common), or that connections to or from the ICs are broken. ... Terje Winther
Effects not working due to problem in battery board
2015-08-06 by moogchild@yahoo.es
Hi, I ve just repaired a KLM-367 board with battery leakage. Everything works fine except that the effects selector does nothing. It is definitively a problem
Re: tuning issue still... / local repair STL
2015-07-29 by fonik@web.de
Hi Bob, As a side note, i am in the process of checking and re-capping the AntiLog circuitry of the polysix i have on my bench. Fun fact is that the values of
Re: [PolySix] Re: tuning issue still... / local repair STL
2015-07-24 by Johannes
It might be one of the 4069 buffers that feed the R2R DA converter (IC6, IC7) Or, I had this once, the MPX CV signal (before the antilog) is routed all over
Re: [PolySix] Re: tuning issue still... / local repair STL
2015-07-24 by Bob Grieb
Hi, On the PolySix, the DAC output is linear. Every step is a semi-tone. That voltage is converted into an exponential one for the oscillators by the
Re: tuning issue still... / local repair STL
2015-07-24 by jacklane@sbcglobal.net
Thanks Tony! Unfortunately the octocoupler has already been replaced. So we can rule that out. Both sides of the board have been thoroughly cleaned and all
Re: tuning issue still... / local repair STL
2015-07-23 by swamp.gigs@googlemail.com
Hi, The issue with the tuning is most likely the optocoupler - see Stefan Huebner s excellent blog on this, which also shows how to diagnose it...
tuning issue still... / local repair STL
2015-07-23 by Jack Lane
Hi All, I am REALLY wanting to get my P6 up and running properly but it s not quite there. Any input will be greatly appreciated! I am not opposed to bringing
Re: [PolySix] KLM-368a Chorus board wanted
2015-07-23 by steve_nichamin@yahoo.co.uk
thanks Jed, ive actually bought one of your boards already to repair the CPU board ;)
Re: [PolySix] KLM-368a Chorus board wanted
2015-07-23 by Jed Jorgensen
Whoops! I didn t realize that said Chorus! Pay no mind to my email. J On Wed, Jul 22, 2015 at 7:26 PM, Jed Jorgensen