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
>
>
>
>
>