Those are pretty much the exact symptoms of the opto coupler failure.
Considering the cost of the new parts I don't know how much testing I'd do.
Get a new one in there and adjust the resistor accordingly.
Jed
On Jul 18, 2013 5:57 PM, "pushwithlegs" <pushwithlegs@gmail.com> wrote:
> ∗∗
>
>
> I'm working on a poly 6 and I'm having trouble trying to tune it. I can
> get it in tune to C on a single octave but I can't seem to get anywhere
> near the range on the trimpots to scale it correctly across the keyboard.
>
> I have done some reading on the forum and people had said to check chip at
> PC1 on KLM 366. Could someone walk me thru how one goes about testing the
> functionality of this chip/opto coupler?
> cheers
>
>
>
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