Hi,
search the message archive for a message from Peter Andersson on
Tue Feb 10, 2004 3:30 pm (msg #646). He had the same problem and
found a replacement part for the opto isolator. I downloaded the
data sheet then. Now I have uploaded it to the files section of
the list.
Cheers,
Johannes
Sam Larch wrote:
> 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
>>
>>
>>
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