Good tips which i will try for sure. I noticed the IC12 (10 leg
transistor type) in the signal board , will heat very quickly, is
this normal ? Since the Trident MK II has the outside dissipator
does the MK I need some extra thing to keep temperature controlled ?
The power supply triacs are heating as hell too...
oh, by the way...when for seconds the distortion is gone i have a
clue on how good this thing sounds...humm...great ! I can't wait to
have this beast in good shape..thanks!!!
Johannes, the preset piano 1 started ok without deep changes in the
trim pots, it seems it was when i pressed the phillips screw driver
in order to turn the pot it started ok, but, after the distortion
came back i could't reproduce it again same way...
--- In
PolySix@yahoogroups.com, Johannes Hausensteiner <johau@...>
wrote:
>
> Hi,
>
> So the preset thing is clear; probably a "genius" cranked the
trimpots
> and made the sounds unusable.
>
> For the distortion: try to find out on what this depends. I would
start
> with a simple setting (e.g.only VCO-1, filter all open, "gate" EG,
etc.)
> Then play around with single parameters and notice under when the
> distortion/modulation starts. Maybe you can find out this way
where
> is comes from.
> Further check whether it is on all 8 voices. If yes, then probably
the
> reason is in a common part (e.g. overall synth gain circuit, ...)
>
> Voice #6: check IC9 of unit #6. On pin1 there should be the VCO-2
> waveform regardless of On/Off setting on the control panel.
IC9/pin13
> is the control signal, it should be high when VCO-2 is on, low
when
> off. IC9/pin2 is the switched VCO-2 wave.
>
> Good luck!
>
> Johannes
>
>
>
> stagerhodes wrote:
> > 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
would 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 using
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
> >
> >
> >
> >
> >
>