Discussion about the Korg PolySix synthesizer

that's not corrosion, that is flux from messy soldering. It can be 
cleaned off by cleaning with IsoPropyl Alcohol.

MH


On 24/02/2013 8:39 a.m., ammerman.sean wrote:
>
> So after doing a little more investigating, I think there's more
> corrosion on the KLM-367 board than I originally thought. While the top
> doesn't look so bad, the bottom looks corroded around the IC30 and IC31
> chips. There also seems to be some corrosion under the IC19 and IC23
> chips. Here are some pics:
> Close up underneath IC30 and
> IC31http://seanammerman.wordpress.com/?attachment_id=458
> http://seanammerman.wordpress.com/?attachment_id=458>
> Underneath entire
> KLM-367http://seanammerman.wordpress.com/?attachment_id=457
> http://seanammerman.wordpress.com/?attachment_id=457>
> Top of KLM-367 with replacement
> battery:http://seanammerman.wordpress.com/?attachment_id=459
> http://seanammerman.wordpress.com/?attachment_id=459>
> Does this look serious enough to cause my patch/memory problems? Based
> on previous comments, it seems that the IC30 and IC31 might control the
> memory. Is this a situation where the traces need to be scraped away and
> repaired?
>
> --- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com>, 
> "ammerman.sean"
> wrote:
> >
> > Thanks for your help guys. I'm going to look into some of those
> possibilities and get back to you all.
> >
> > --- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com>, 
> "Scott" wrote:
> > >
> > >
> > >
> > > --- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com>, 
> "ammerman.sean" wrote:
> > > >
> > > > Hey everyone, I have a Polysix that that is experiencing patch
> memory problems. It was bumped a little too hard during a gig. I don't
> know if this is what caused the malfunction or not. Anyway, here's the
> specific issue:
> > > >
> > > > When you turn the keyboard on, bank "D" and program "4" are
> automatically selected. Originally, bank "A" and program "1" would be
> illuminated when you turned it on.
> > > >
> > > > When you select other banks and programs, the buttons for "D" and
> "4" always stay illuminated. So if you choose another bank, it will be
> illuminated along with "D." The same goes for when you choose another
> program -- "4" always stays lit. To get a better idea of what I mean,
> check out a pic: http://seanammerman.wordpress.com/?attachment_id=445
> > > >
> > > > Program button "8" does not work and will not illuminate when you
> press it.
> > > >
> > > > The keyboard powers up and produces sound; however, all my saved
> patches are gone. The current sounds are a bit harsh and generic, but
> they are somewhat "musical." After selecting the "manual" patch, you can
> edit and create new sounds like usual. It seems that all the
> effects/MG/VCO etc. are working fine.
> > > >
> > > > Unfortunately, the keyboard will no longer save any of my "found"
> patches. I tried to load patches that I saved to a cassette, but this
> does not work either. Remember, bank "D" and program "4" always stay
> selected. "D" is also the error/cancel indicator for the tape enable.
> > > >
> > > > I disconnected the The KLM-371 board and it looks OK to me. Here's
> a few pics:
> > > > http://seanammerman.wordpress.com/?attachment_id=451
> > > > http://seanammerman.wordpress.com/?attachment_id=452
> > > > http://seanammerman.wordpress.com/?attachment_id=453
> > > >
> > > > I took it to a local keyboard repair tech, but he wasn't
> experienced with analog/vintage synths. He was able to determine that
> the battery(which has been replaced) was working fine. To my eyes, I
> don't see any corrosion from leakage.
> > > >
> > > > Does anyone have any idea what's causing the issue? I appreciate
> any help, advice or thoughts. I am a bit of an amateur, but I love this
> thing and would hate to see it go.
> > > >
> > > Hi...
> > >
> > > Does the Poly exhibit the same problems with the circuit board OUT
> of the panel>?...If not , it could be an alignment/button issue. If it's
> still weird then you'll have to consider having the pc boards looked at
> on the TRACE or circuit side. One broken copper etch could screw things
> up.Have someone "techie" look for hairline cracks in the circuit traces.
> > > Also, one by one, pull all of the multipin connectors and re-seat
> them
> > > See if that helps or not. These units DO have some years behind them
> and oxide get into the weirdest places.
> > >
> > > I just finished going "through" an ARP AXXE, a Juno 60 and a TR-808.
> > >
> > > They're all fine now and going home tomorrow
> > >
> >
>
> [Non-text portions of this message have been removed]
>
> 

-- 
Kind Regards<br>
Murray<br>
murray@paintingwithsound.co.nz<br>
www.paintingwithsound.co.nz<br>



[Non-text portions of this message have been removed]