Fw: [vintagesynthrepair] Help With a Chroma Polaris - Please?
2018-05-15 by Tracy Barber
--- On Mon, 4/30/18, adirondack_pc@... [vintagesynthrepair] <vintagesynthrepair@yahoogroups.com> wrote:
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> 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
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> 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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