Discussion about the Korg PolySix synthesizer

Hi Johannes,

i will try your tips and see what happens...only one thing , the 
distortion is more proeminent with EG Intensity to full positive 
position (all turned right) not negative as you understood...
thanks !!!

--- In PolySix@yahoogroups.com, Johannes Hausensteiner <johau@...> 
wrote:
>
> Hi Art,
> 
> No,the flanger does not have any influence on the synth section,
> technically.
> So, what  I get from your post is that there are (possibly) two
> problems:
> 1) some kind of distortion plus modulation; more prominent when the
>     VCO is set to 16' or 8', and EG intensity is turned up
> 2) the presets (Piano 1, Piano2, Clav) do not make any meaningful
>     sound but only a short "blop" (or something).
> 
> ad 1):
> please find out more about the circumsatnces of the distortion.
>    (VCO-1/VCO-2/both, Saw/Square/Pulse wave, VCF cutoff, VCF 
resonance,
>    etc.)
> 
> ad 2):
> - check the connection between KLM-317 and KLM-292.
> - select Piano1 and turn of of the pots on KLM-317 belonging to 
Piano1
>    (e.g. cutoff = VR27; make a mark on the pot before to find the
>    original setting). Listen to the sound or measure with DVM on 
KLM-292
>    on IC11/pin7 and check whether the voltage changes.
> 
> 
> Good luck!
> 
> Johannes
> 
> 
> 
> 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
> >>>
> >>>
> >>>
> >>> 
> >>>
> >>>
> >>>
> >>>
> >>
> > 
> > PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6 
> > Yahoo! Groups Links
> > 
> > 
> > 
> >
>