Rhodes Chroma Polaris

--- On Mon, 4/30/18, adirondack_pc@... [vintagesynthrepair] <vintagesynthrepair@yahoogroups.com> wrote:

> From: adirondack_pc@... [vintagesynthrepair] <vintagesynthrepair@yahoogroups.com>
> Subject: [vintagesynthrepair] Help With a Chroma Polaris - Please?
> To: vintagesynthrepair@yahoogroups.com
> Date: Monday, April 30, 2018, 1:03 AM
> 
>  
> 
> 
> 
>   
> 
> 
>     
>       
>       
>       Hi Everyone -
> 
> I
> have just undertaken refurbishing my Polaris.  I 
> fixed the output jacks, did a mod on my headphones
> (absolutely NO 
> NOISE!), replaced the entire faceplate (Paul DeRocco)
> (because of faulty
>  original strips), soldered in an LED and swapped out two
> sliders after 
> repairing and cleaning them.
> 
> To me, that's about 4 hours work.  
> But I love my Polaris sound.  I wouldn't do all that
> for another 
> keyboard, except for...   anyway, here's my woes...
> 
> 1) Filter 
> Cutoff.  when you first start to slide, it's sort of
> dead but then comes
>  to life.  Slide back to bottom and the sound completely
> goes away.  
> Dead space.  It's not the slider because I just changed
> it and received 
> the same results as before.  Exactly the same, but better
> movement.
> 
> 2)
>  Resonance - next to the Cutoff - related problem?  I just
> replaced the 
> slider and received the same results, although the slider
> was cleaned 
> and so forth.  When I hit the top, it gives resonance, but
> also some 
> when I pull it all the way down.  Ridiculous.  Also much
> better 
> movement.
> 
> 3)
>  I replaced the top left motherboard a while back with a
> used one (hence
>  the broken LED) but that works now over Noise.  Minor
> issue, can't 
> complain.  I had similar problems before with the old top
> left 
> motherboard, but the sliders were a little bent and gave a
> slightly 
> different result.  This tells me it goes deeper than
> surface.
> 
> 4) 
> Now - when these problems occur, hitting the patch number I
> was playing 
> brings back the original patch with no deformities /
> abnormalities.  
> That's nice, but when I want a little Cutoff, I get
> totally "cut off" 
> (pun intended).
> 
> 5) The
> sliders on Cutoff and Resonance and smooth
>  with no bumps / bruises since they'd been cleaned /
> replaced.  At least
>  I'm learning some good techniques here.  There's a
> guy on YouTube who 
> demonstrated how to do it properly and I think I have that
> part down 
> now.
> 
> Observation: Methinks
> the Cutoff and Resonance have a chip /
>  board problem but I wouldn't know where to look. 
> I'm getting handy 
> with a soldering gun, but not with schematics.  I have 25
> years 
> repairing PCs but little multi-meter experience, especially
> when the 
> specs aren't available.  I have the Polaris schematics
> and service 
> manual but I need to research it to get a clue as to what
> I'm up 
> against.
> 
> If anyone can help
> me here, I have the remainder of the 
> old top left motherboard, minus a few sliders and an LED
> that I'd gladly
>  send to you in exchange for the info.  The sliders sell on
> eBay for a 
> few $ and it would be a small gold mine of parts.
> 
> Thanks for reading.  I hope
> to hear from someone on this - even a clue!
> 
> Tracy
> BarberPolaris
> Fiend
> 
> 
> 
>     
>      
> 
>     
>     
> 
> 
> 
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