Discussion about the Korg PolySix synthesizer

Hi backshall,

Yes, this is inherent of the design.

> On Nov 19, 2013, at 6:55 PM, "backshall1" <backshall1@bellsouth.net> wrote:
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> It is normal for the Polysix to be extremely out of tune for the first few seconds after it is powered on. I worked on one that seemed reasonably in tune after about 5 seconds, and another that took almost 30 seconds before it sounded decent. I believe that would be caused by the thermistors warming up, not an optocoupler problem. Do the LEDs behave any differently if the keyboard is unplugged from the 366 board?
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> Don B.
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> From: PolySix@yahoogroups.com [mailto:PolySix@yahoogroups.com] On Behalf Of Frank Carvalho
> Sent: Tuesday, November 19, 2013 6:27 PM
> To: PolySix@yahoogroups.com
> Subject: Re: [PolySix] Weird assigner issue
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> No, something is wrong. It freaked while opening it up. After I unscrewed the keyboard it got better, and seemed to act normal,  with all 6 Leds coming on. But suddenly it jumps back into freak mode, where only Leds 1-4 light up. Here the missing keys are F1, F1#, C2#, D2 etc.
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> I can get it out of freak mode by switching it off and on, but it will fall back into failure.
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> Btw, the optocoupler struggles initially to get the synth into tune. Could it be straining something?
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> (Maybe I should get a VTL5C9 instead)?
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> Frank
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> Sendt fra Samsung mobil
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> -------- Oprindelig meddelelse --------
> Fra: Frank Carvalho <dko4342@vip.cybercity.dk>
> Dato:
> Til: PolySix@yahoogroups.com
> Emne: Re: [PolySix] Weird assigner issue
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> Hi Johannes
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> Ok, so I turned it on to do the checks you mentioned, and everything now sounded normal again! But after a few notes, it started to get weird again, and then went back to normal. Tapping lightly on the left side of the panel reveals that I have a bad connection somewhere.
> I have to open the synth again, and check for bad connections. Maybe a bad soldering, as I recently replaced the optocoupler. Fortunately, I have to say. That means that there is probably nothing fundamentally wrong with it. I'll see if I can find the culprit.
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> Thanks so far
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> Frank
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>> On 11/18/2013 11:16 PM, Johannes Hausensteiner wrote:
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>> OK, so the keys that do not work are F#1, G1, D2, D#2, A#2, B2, F#3, G3,
>> D4, D#4, A#4, B4, F#5, and G5, correct?
>> When starting the arpeggiator (besides playing wrong notes) does it
>> light the small voice-LEDs on KLM-366?
>> When connecting a footswitch to the CHORD MEM footswitch jack, does the
>> CHORD MEM button LED work as expected (can be switched on and off by
>> footswitch)? Note: if you do not have a footswitch you can you a normal
>> phone cable and short the tip to the sleeve on the far end connector
>> with a paperclip or similar for a test.
>> And the HOLD button works?
>>
>> From the noworking keys I would say the lines P16 and P17 are not
>> working correctly. But the buttons and the VCO control voltage should
>> work OK...
>>
>> Try: disconnect CN12 from KLM-366 (this goes to KLM-371). Are the notes
>> in tune?
>>
>> Johannes
>>
>> On 18.11.2013 19:15, Frank Carvalho wrote:
>> >
>> >
>> > Poly/Chord/Uni do not seem to have any effect, and the LEDs don't come on.
>> > Hold is on when the synth is turned on, but can be turned off and on.
>> > Hold now lights up.
>> > If the keys are numbered repeatedly with 1 to 8, beginning with the
>> > lowest key, then it is every number 6 and 7 that is off.
>> > The arpeggiator sends repeated trig signals, but as the same note sounds
>> > every time, I cannot hear anything but the repetition. Actually the
>> > sound is much like a detuned unison mode.
>> >
>> > And, yes, I have an ancient Philips oscilloscope, if necessary.
>> >
>> > I certainly hope I can fix it. I love this synth.
>> >
>> > Oh, before anyone asks, I did the battery mod long ago, before any leaks
>> > occurred.
>> >
>> > Thanks
>> >
>> > /Frank
>> >
>> > On 11/18/2013 09:09 AM, Johannes Hausensteiner wrote:
>> >>
>> >> The issue is related to the KLM-366 Key Assigner CPU circuitry. Probably
>> >> two of the I/O lines are dead (remember, it is an 8bit CPU).
>> >> Which keys do work and which don't?
>> >> Do the key assigner buttons (POLY/UNI/CHORD/HOLD/ARP) work?
>> >> Does the arpeggiator don anything?
>> >>
>> >> Do you have access to an oscilloscope?
>> >>
>> >> This surely can be fixed!
>> >>
>> >> Johannes
>> >>
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