Discussion about the Korg PolySix synthesizer

Thanks.  That's interesting about the pitch bend wheel.  I think I'll 
figure out a way to attach springs as rubber bands tend to degrade 
quickly.  I wonder why it wasn't spring loaded from the factory.

Are there trace maps available anywhere?  I was looking at Old Crow's 
site again and saved some of the shots of the trace maps he uses in 
his guide to fixing the battery damage.  I already noted an error in 
the prior repair done to mine and a few traces that need repair but 
weren't.  I think I can get by with the shots from Old Crow's, but a 
complete map would be handy.

Questions:  here's my inexperience showing through, but, where the 
traces switch from top to bottom (or bottom to top, as it were), a 
lot of those solder points had corrosion on the top of the board.  
Now, what I did was first clean the board with alchohol, then I 
slapped some baking soda paste on that section of the board, let it 
sit, then scrubbed (lightly) to clean it up and neutralize any 
remaining acid.  Most of those solder points clean up well, but I'm 
wondering if I need to drop some fresh stuff in those holes, or if I 
can just reflow them?  Would I do either from the top or bottom of 
the board?

What functions do ICs 30 and 31 handle?  Are either of these 
the "programmer IC?"

The legs on both are definately in tact; they seemed to have survived 
the acid bath fine (I think IC 31 was replaced because it looks 
more "fresh" than the other ICs and a trace was removed from 
underneath it), so there's no reason to remove them, yes?

Yeah, so, I was despondent last night, and I'm still pissed, but I'm 
not giving up yet while the thing sits in my house. 




--- In PolySix@yahoogroups.com, "trekpilot" <trekpilot@y...> wrote:
> Hi there.
> 
> The only things i can add to your post are, 1) the Polysix pitch 
bend
> wheel never did have springs (at least, mine didn't) so I just took 
an
> elastic band and wrapped it around the wheel.  This works 
suprisingly
> well.  And, 2) my Polysix also suffered from the two-LEDs-on 
problem,
> and I was advised that it is a possible bad programmer IC.  So I was
> forced to cannibalize my machine, and that's the end of that era.  
I'm
> trying to use what boards remain to build other units, which is an
> evolving process.  Sorry I couldn't be more helpful.  
> 
> T. Cardinal