Discussion about the Korg PolySix synthesizer

Hi Johannes

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.

Thanks so far

Frank

On 11/18/2013 11:16 PM, Johannes Hausensteiner wrote:
>
> 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
> >>
> >
> >
> >
>
>