Discussion about the Korg PolySix synthesizer

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



On 17.11.2013 17:27, Frank Carvalho wrote:
> Hi
>
> My P6 has started having a new issue.
> The synth sounds really weird. Here are the symptoms:
> - When I boot it, it comes up with the arp on, and none of the assigner
> LEDs are lit.
> - All settings sound a bit like a unison note gone totally out of tune.
> - Freq does not change with different keys, but scaling of the filter
> seems to follow keyboard
> - Every 7th and 8th note of the keyboard is silent. The keys in between
> trigger notes (the same one all the time)
>
> I suppose this is an issue with the assigner board(?), but have no idea
> where to start. I recently replaced the optocoupler with a VTL5C1 and
> cured the keyboard scaling issue. I don't think this is related, but
> then you never know, do you?
>
> Any ideas?
>
> /Frank
>
>
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