Rhodes Chroma Polaris

I bought it from a guy on the analog list and the thing is
cosmetically almost perfect. It clearly sat in a studio and wasn't
used much. The previous owner warned me a particular problem and
after it warmed up, I've seen it as well.

After I played with it for about 1/2 an hour, I pressed the "tune all"
button. Afterwards, certain notes were out of tune with the others.

I pressed the tune one button, but it doesn't fix it.

Any ideas?

I think the synthesizer otherwise is fine. I think. Hard to tell.

But all the buttons, keys and membranes are working, so that strikes
me as a good sign.

I have 3 Polaris keyboards, on 2 it has been necesary to replace the
sample-hold capacitors to fix detuned voices. The process isn't for
the faint of heart (it requires replacing 12 or maybe even 24
capacitors) on the boards parts cost is about $24 but it takes almost 2
hrs to complete the repair. Another sign of the problem are certain
notes that seem to slide into pitch.

I think I posted more on the issue about a year ago but I would
recommend to skilled solderers only.

-Ben

> After I played with it for about 1/2 an hour, I pressed the "tune all"
> button. Afterwards, certain notes were out of tune with the others.
>
> I pressed the tune one button, but it doesn't fix it.
>
> Any ideas?

I have 3 Polaris keyboards, on 2 it has been necesary to replace the
sample-hold capacitors to fix detuned voices.  The process isn't for
the faint of heart (it requires replacing 12 or maybe even 24
capacitors) on the boards parts cost is about $24 but it takes almost 2
hrs to complete the repair.  Another sign of the problem are certain
notes that seem to slide into pitch.

I think I posted more on the issue about a year ago but I would
recommend to skilled solderers only.

-Ben

> After I played with it for about 1/2 an

hour, I pressed the "tune all"

> button.  Afterwards, certain notes

were out of tune with the others.

>
> I pressed the tune one

button, but it doesn't fix it.

>
> Any

ideas?