Discussion about the Korg PolySix synthesizer

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, "ammerman.sean" <sean.ammerman@...>
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, "Scott" wrote:
> >
> >
> >
> > --- In PolySix@yahoogroups.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
> >
>

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