Discussion about the Korg PolySix synthesizer

You can check the message history to find that a few P6 owners are having a
tuning problem.  The most likely culprit, it seems, is that an opto-isolator
(HTV-P1501) has failed which in turn is rendering the tune-high useless...so
the board won't tune correctly.

I've been unable to find a replacement opto-isolator - or a datasheet even.

If you - or anyone else for that matter - finds a supplier for these ICs, or
has a replacement circuit (even better) please let us all know.




On 6/25/06, Mike Thompson <tubmyk2@comcast.net> wrote:
>
>    I recently had my Polysix KLM-367 board serviced through Old Crow
> (replacement, rather)
> and just got it back a few days ago. Unfortunately I needed to
> re-calibrate the oscillators
> and tune them since it sat for so long not being used. But the tuning is
> still off - not really
> a seperate oscillator problem so much as I can't get it to the right pitch
> using the tune
> knob. Even at the max to the right (sharp) I cannot get the unit to hit a
> perfect a-440.
> And just to clear up the dummy-factor, I even made sure that the tune knob
> was set at
> dead-center when I began the oscillator tuning, so i would have
> flexibility in both
> directions if the tuning shifted. I am about to re-do the process but I am
> curious if
> anyone else has suggestions as to why this may happen even though I kept
> the pot at the
> center? Any help is appreciated, thanks.
>
> ~Mike
>
> 
>


[Non-text portions of this message have been removed]