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]
> 
> 
> 
> 
> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6 
> Yahoo! Groups Links
> 
> 
> 
>  
> 
> 
> 
>

>
> 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@...> 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]
> > 
> > 
> > 
> > 
> > PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6 
> > Yahoo! Groups Links
> > 
> > 
> > 
> >  
> > 
> > 
> > 
> >
>

> Ok thanks.  It makes sense I guess, but I'm probably going to try tuning it one more time 
> because I really don't feel like putting any more effort into this keyboard if I can help it.  I 
> just got an OB-8 so I really don't need the P6, but I like the arpeggiator and SSM sound so 
> that's why I keep it around.  Any idea how much that part cost anyway?
> 
> --- In PolySix@yahoogroups.com, Johannes Hausensteiner <johau@...> wrote:
> 
>>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@...> 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]
>>>
>>>
>>>
>>>
>>>PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6 
>>>Yahoo! Groups Links
>>>
>>>
>>>
>>> 
>>>
>>>
>>>
>>>
>>
> 
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> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6 
> Yahoo! Groups Links
> 
> 
> 
>  
> 
> 
>