DO NOT TOUCH IC12 !
If you're not looking for any further trouble... Johannes and me were
just trying to solve a problem on my Trident on which that particular
component was responsible... a 40-70$ priced unit and very hard to
get. It is responsible for the overall scaling and tuning of the
instrument. It is supposed to get hot indeed and has a built
in "oven" which keeps it in a particular, stable temperature. My
problem started when I tried to use a freezing spray to trying to
find the cause for another problem, and unfortunately sprayed some
onver it as well.... so stay away from it ;)
--- In PolySix@yahoogroups.com, "stagerhodes" <stagerhodes@...> wrote:
>
> 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
> > >
> > >
> > >
> > >
> > >
> >
>