Discussion about the Korg PolySix synthesizer

The P6 I'm currently working on had the same problem. I replaced IC30 
and now instead of banks 2, 6, B and "Write" led lighting up, the 
bank selection section will work fine TILL you switch any of the 
above mentioned switches. Once that happens, clicking on 2 will 
switch the 3 on instead... clicking on 6 will switch 5 (or 7, can't 
remember), switching "Write" will turn the "Manual" switch on....

I didn't scrape all traces yet, and my intention is to replace all 
4042 ICs which come directly in contact with IC31 (which was totally 
eaten by the acid) as well. Maybe we should try replacing all 4042 as 
well at the area.




--- In PolySix@yahoogroups.com, "wasteking1" <wasteking1@...> wrote:
>
> it appears from many recent posts that a very common issue with the 
> Polysix  after battery leakage is that certain LEDs stay on all the 
> time. Commonly the patch selection ones, but others as well. Now a 
few 
> people (including myself) have replaced IC 30 and 31  but this 
hasnt 
> helped. Aparrently digging out corroded traces doesnt solve the 
problem 
> either... Thus I will propose that the problem is UNWANTED 
> CONTINUITIES. The pushbutton switches stay on..or is it that they 
are 
> bypassed and the LEDs light up because they get current regardless 
of 
> the switch position.  Can the battery acids, if they are indeed 
> conductive , actually soak into the plastic board? Would there be a 
way 
> to literally SOAK the board in a neutralizer that wouldnt hurt the 
> chips etc? any other thoughts?
>