Discussion about the Korg PolySix synthesizer

ok...i think i made some progress here...when trying to adjust VR27 
in the presets board (with piano 1 , as Johannes told) suddenly i 
heard the sound loud and clean...after a bit the distortion came 
again...well, in this process when it sounded ok i changed from 
piano 1 to manual and the synth was there without 
distortion...but...no VCF working (just the FINE Cutoff was 
working)...so i believe my problem is related with the filter...i 
will do more testing here, in the mean time if someone can give some 
clues based on this it would be great..thanks to all ! 
Oh..almost forgot...i found the VCO 2 not working in the voice #6. 
 
 
 
--- 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 
> > > > >  
> > > > >  
> > > > >  
> > > > >   
> > > > >  
> > > > >  
> > > > >  
> > > > > 
> > > > 
> > > 
> > 
>