Discussion about the Korg PolySix synthesizer

Hi ,
tonight i will take a longer look to the flanger board, as well as 
trying some of the tips Johannes gave me (yesterday i was out and 
couldn't be around the Trident)...the distortion is heard despite the 
used VCOs , and when both VCOs are active messing with VCO 2 Tune pot
gives me a kind of ring modulation with the correct pitch beeing 
heard with less volume than the "ring modulation"...

Thanks all for the help on this !!!!


--- In PolySix@yahoogroups.com, "gil_we" <gil_we@...> wrote:
>
> Also, can you see any broken or "cold" solder joint on this board ?
> 
> 
> 
> 
> 
> 
> --- In PolySix@yahoogroups.com, "gil_we" <gil_we@> wrote:
> >
> > The Flanger board (KLM-291) is also the mixer board, in case it 
got 
> > defective it makes sense to me that the synth problem may be 
> related 
> > to a defect on that board as well.
> > 
> > Do you get that problem only, but only for the synth sound ?
> > 
> > Does it sound distorted on both VCOs ? You can eliminte VCO1 and 
> only 
> > listen to VCO2 and vice versa ?
> > 
> > 
> > 
> > --- In PolySix@yahoogroups.com, "stagerhodes" <stagerhodes@> 
wrote:
> > >
> > > thank you !...well, the controls are working, only it makes a 
> kind 
> > of 
> > > distortion which is more audible in the 16' and 8' octaves, it 
> > > reduces it in the 4' ( a distortion with some kind of 
> modulation ), 
> > > the bad effect will be more noticed too if one set the EG 
> Intensity 
> > > to center or full counterclockwise (negative envelope). I tried 
> to 
> > > memorize 2 patches and the programmer seems ok, the patches are 
> > > there, so i just don't know what to do next...
> > > I must say that it seems the top panel was (may be the unit 
> crashed 
> > > in the floor or something) bend in the master tune pot area, 
> after 
> > a 
> > > close look i saw one of the screws fixing the Flanger board , 
in 
> > its 
> > > place with a small PCB fragment attached, and the board broke 
in 
> > one 
> > > of its edges (screw area). I took out the flanger board and it 
> > seems 
> > > no damage in any of the pcb traces...anyway does any 
malfunction 
> in 
> > > this board reflects in the synth section sound (with flanger 
> turned 
> > > off) ??
> > > Oh, the preset sounds are not ok, just a short beep (low 
> > frequency), 
> > > the strings and brass are OK
> > > regards
> > > Art 
> > > 
> > > 
> > > --- In PolySix@yahoogroups.com, Johannes Hausensteiner <johau@> 
> > > wrote:
> > > >
> > > > The PCB looks OK; no damage due to leaked battery as in the 
> > Polysix
> > > > is visible.  According to the pics (silkscreen) the battery 
> which 
> > is
> > > > mounted seems to be original or genuine replacement.  So I 
> wuuld 
> > not
> > > > suspect a threat like in the P6.  It largely depends on the 
> > battery
> > > > make, which seems to be good quality in this unit. So as long 
> as 
> > the
> > > > battery retains sufficient voltage (more than 2.5V) I would 
not
> > > > worry about it.
> > > > This does not surprise me, since the Trident MK I programmer 
> and 
> > the
> > > > MK II programmer are completely different. MK I was designed 
> > before
> > > > Polysix, MK II afterwards or the same time obviously useing 
the 
> > same
> > > > technique in both (edit mode, etc). Amazingly they did not 
use a
> > > > microprocessor for the patch manager in the MK I but an all-
> > hardware
> > > > type of design.
> > > > 
> > > > Regarding your original problem: it may be (even likely) that 
> the
> > > > battery is dead or at least discharged and all memory patches 
> are 
> > > gone
> > > > producing no or meaningless sound. Are the knobs and switches 
> > > working
> > > > in "Manual" mode? How do the presets ("Piano 1", "Piano 
> > 2", "Clav")
> > > > sound?
> > > > 
> > > > According to the schematics there are on KLM-317 three sets 
of 
> > pots
> > > > for the presets; you may set your favourite sound patches 
there.
> > > > (The Yamaha CS-60 and CS-80 had a similar kind of "Patch 
> > Memory"..)
> > > > 
> > > > Johannes
> > > > 
> > > > 
> > > > stagerhodes wrote:
> > > > > Hi,
> > > > > just uploaded 8 photos of the board, hope they're ok now 
for 
> > you 
> > > to 
> > > > > try to help me.
> > > > > regards,
> > > > > Art
> > > > >
> > > > > 
> > > > > --- In PolySix@yahoogroups.com, "gil_we" <gil_we@> wrote:
> > > > > 
> > > > >>you're welcome,
> > > > >>
> > > > >>I'm interested to see how corroded is the board - if any at 
> all.
> > > > >>
> > > > >>
> > > > >>--- In PolySix@yahoogroups.com, "stagerhodes" 
> > <stagerhodes@y...> 
> > > wrote:
> > > > >>
> > > > >>>Hi Gil,
> > > > >>>well, i'm not at home right now, but the battery is from 
> > Sanyo, 
> > > and 
> > > > >>>the big lettering is CADNICA (nickel cadmium).
> > > > >>>I will take better pictures tonight and post them 
(deleting 
> > the 
> > > ones 
> > > > >>>there now)...well, what can i say besides thank you for 
your 
> > > > >>>support ...
> > > > >>>
> > > > >>>
> > > > >>>--- In PolySix@yahoogroups.com, "gil_we" <gil_we@y...> 
wrote:
> > > > >>>
> > > > >>>>It's very hard to see anything on those pictures... I do 
> see 
> > > though 
> > > > >>>>that the battery was already replaced ?? looks like a 
> lithium 
> > > battery 
> > > > >>>>what does it say on it ?
> > > > >>>>
> > > > >>>>Try to provide close up high resolution pictures of the 
> > > programmer
> > > > >>>>
> > > > >>>>
> > > > >>>>--- In PolySix@yahoogroups.com, "stagerhodes" 
> > > <stagerhodes@y...> wrote:
> > > > >>>>
> > > > >>>>>I think i have another problem here, not related with 
> > battery 
> > > leak, 
> > > > >>>>>i just uploaded some photos , not very good quality, but 
> the 
> > > battery 
> > > > >>>>>seems to be sealed, and the programmer is working 
despite 
> > some 
> > > press 
> > > > >>>>>memory recall buttons need cleaning or replacing. Well , 
> the 
> > > synth 
> > > > >>>>>sound has some distortion and sounds like ring 
modulation, 
> > > this is 
> > > > >>>>>minimized if the negative/positive VCF EG Intensity is 
> full 
> > > > >>>>>clockwise. The preset sounds are like no envelope 
sustain, 
> > > just a 
> > > > >>>>>short low (frequency) click...well, i'm not a keyboard 
> > > technician,
> > > > >>>>>just trying to make something here, otherwise i will 
have 
> to 
> > > take
> > > > >>>>>the synth and schematics to a friend who is a technician 
> > > (works in 
> > > > >>>>>musical instruments, not vintage ones but...) and try to 
> put 
> > > this 
> > > > >>>>>synth to play...have to say the brass and strings 
sections 
> > are 
> > > ok,  
> > > > >>>>>the split keyboard function switches and behavior are 
ok, 
> > bend 
> > > and 
> > > > >>>>>mod ok...well...lets see
> > > > >>>>>
> > > > >>>>> 
> > > > >>>>>--- In PolySix@yahoogroups.com, "gil_we" <gil_we@y...> 
> > wrote: 
> > > > >>>>>
> > > > >>>>>>Thanks, 
> > > > >>>>>> 
> > > > >>>>>>I believe that this type of info should be shared all 
> over 
> > > the net.  
> > > > >>>>>>The Trident's schematics are very rare - took me weeks 
to 
> > get 
> > > them; 
> > > > >>>>>>however, here they are. 
> > > > >>>>>> 
> > > > >>>>>>I got my Trident in disasterous condition, nothing 
> worked, 
> > > battery  
> > > > >>>>>>corrosion, bad chips, everything you may think of... 
Got 
> it 
> > > work  
> > > > >>>>>>finally after doing the refurbishment step by step. 
This 
> is 
> > > an  
> > > > >>>>>>incredible machine, one of the best ever made and 
> > definately 
> > > Korg's  
> > > > >>>>>>best Polysynth. 
> > > > >>>>>> 
> > > > >>>>>>Let us know how you proceed, also if you can take some 
> > > pictues of the  
> > > > >>>>>>board it would help.
> > > > >>>>>> 
> > > > >>>>>> 
> > > > >>>>>>--- In PolySix@yahoogroups.com, "stagerhodes" 
> > > <stagerhodes@y...> wrote:
> > > > >>>>>>
> > > > >>>>>>> Oh, i'm very pleased regarding this group , many 
thanks 
> > for 
> > > your 
> > > > >>>>>>> reply and the schematics beeing available for 
> download... 
> > i 
> > > will 
> > > > >>>>>>> unmount the Trident may be tonight or tomorrow night 
> and 
> > > will post my 
> > > > >>>>>>> sights inside. This is one of my favorite (regarding 
> it's 
> > > wood design 
> > > > >>>>>>> and the sound, particularly the synth section) 
> keyboards 
> > > from korg , 
> > > > >>>>>>> and i can say i tried almost them all at the time 
they 
> > were 
> > > beeing 
> > > > >>>>>>> produced since i was working demoing them in a shop. 
So 
> > now 
> > > is the 
> > > > >>>>>>> time for me to have some of them in full working 
> > > condiction...
> > > > >>>>>>> Art
> > > > >>>>>>> 
> > > > >>>>>>> 
> > > > >>>>>>> --- In PolySix@yahoogroups.com, "gil_we" 
<gil_we@y...> 
> > > wrote:
> > > > >>>>>>>
> > > > >>>>>>>> I didn't fully understand how the synth section acts 
> on 
> > > this machine...
> > > > >>>>>>>> Also, is there corrosion (green colored) on the 
> battery 
> > > and near it ?
> > > > >>>>>>>> Are there bad (black colored)traces ? are the signal 
> and 
> > > synth boards 
> > > > >>>>>>>> correded as well on some areas ?
> > > > >>>>>>>> 
> > > > >>>>>>>> Take extra care not to hurt anyting that works. 
> > > Particually, stay 
> > > > >>>>>>>> away from the 10 leg transistor type component at 
the 
> > > bottom left 
> > > > >>>>>>>> side of right bottom (signal) board. This one is 
> > extremely 
> > > sensitive 
> > > > >>>>>>>> to extreme temperature changes and is very rare and 
> > > expensive to get.
> > > > >>>>>>>> 
> > > > >>>>>>>> You can use the schematics I uploaded to the Files 
> > section.
> > > > >>>>>>>> 
> > > > >>>>>>>> 
> > > > >>>>>>>> --- In PolySix@yahoogroups.com, "stagerhodes" 
> > > <stagerhodes@y...> wrote:
> > > > >>>>>>>>
> > > > >>>>>>>>> Hi,
> > > > >>>>>>>>> i just bought a Trident MK I in which the poly 
synth 
> > > section is 
> > > > >>>>>>>>> malfunctioning, i am almost certain that the 
problem 
> is 
> > > the battery 
> > > > >>>>>>>>> question , and the leakage from it. It seems the 
tune 
> > is 
> > > ok, all notes 
> > > > >>>>>>>>> are sounding (brass and strings sections), in the 
> synth 
> > > section one can 
> > > > >>>>>>>>> ear some sound (it is possible to ear the notes 
> pitch, 
> > > but with some 
> > > > >>>>>>>>> strange effects in them) and the memory section is 
> not 
> > > working which 
> > > > >>>>>>>>> leads me to the battery question. Is there any 
> special 
> > > care i must have 
> > > > >>>>>>>>> in this model ?
> > > > >>>>>>>>> regards
> > > > >>>>>>>>> Art
> > > > >>>>>>>>> Portugal
> > > > >>>>>>>>>
> > > > >>>>>>>>>
> > > > >>>>>>>>
> > > > >>>>>>>
> > > > >>>>>>
> > > > >>>>> 
> > > > >>>> 
> > > > >>> 
> > > > >> 
> > > > > 
> > > > > 
> > > > > PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6 
> > > > > Yahoo! Groups Links
> > > > > 
> > > > > 
> > > > > 
> > > > >  
> > > > > 
> > > > > 
> > > > > 
> > > > >
> > > >
> > >
> >
>