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Rhodes Chroma Polaris

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Just got a Chroma Polaris

Just got a Chroma Polaris

2005-12-13 by tkrotchko

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.

Re: Just got a Chroma Polaris

2005-12-13 by bkuris

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
Show quoted textHide quoted text
> 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?

RE: [chromapolaris] Re: Just got a Chroma Polaris

2005-12-13 by tkrotchko

I don't mind doing that; I'm pretty fair with soldering station; I haven't
opened it up yet.
 
The questions I have are:
 
(a) how can I determine if that is the issue
(b) what value/type should I use? (A digikey part # would be great)
 
Also, what kind of circuit board is it?  Its not one of those 7 layer
boards.  Does the thing have to come apart completely?
 
(appreciate the help, BTW)

  _____
Show quoted textHide quoted text
From: chromapolaris@yahoogroups.com [mailto:chromapolaris@yahoogroups.com]
On Behalf Of bkuris
Sent: Tuesday, December 13, 2005 4:35 PM
To: chromapolaris@yahoogroups.com
Subject: [chromapolaris] Re: Just got a Chroma Polaris


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?







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