[sdiy] Polysix w/korg midi retrofit. Anyone ever work on one/know where to get schemos?

[Bob Weigel]

My polysix synth board schemos really aren't very good anyway.  But I 
thought this thing was going to be a relatively easy fix.  I got the 
battery spill repaired.

Then...it worked save a few LED's on that shouldn't be (C and 3) and the 
pitch/mod didn't work.  When I wiggled the main cpu i/c to the retro 
board, I would get pitch jumping around then in the right position the 
wheel and pitch worked as well as the tune knob.  I pulled the i/c and 
looked and sure enough it was parting and some obvious bad connections.

I did a bang up job hard wiring it.  My reward?  Tunings are totally 
goofy.  All over the map.  Wiggling things around it seemed the early 
production sub board i/c might be the problem though..I was having a 
hard time seeing how that would make this problem...but now I was 
actually able to get the synth to play in tune with nice timbre's and 
noticed that the LED's were no longer on that shouldn't be....but the 
pitch and wheel wouldn't work at all now!

In the process I got a strong correlation to the other cpu i/c and 
soldered it too.  OH and I should mention that the tuning...was 
floating.  I could touch the op amp and shift the tuning 
baseline...widely.  and it would stay there up above!  Weird huh? 

Anyway now after resoldering the second cpu it just went totally worse.  
Haven't gotten more the tic tic lf sounds out of it. -Bob