Discussion about the Korg PolySix synthesizer

Current situation -

Trident powers up correctly, String section works OK except for 
unable to click the 16' and 8' on/off. Besides all section works.
Brass section doesn't play any sound. Synth section plays the saw 
waveform ok, PM doesn't play sound, and PWN plays a what sounds like 
a contineous "ta-ta-ta-ta-ta". VCF sectiob doesn't make any change 
to sound.


What I did so far -

1. changes battery to another NiCAD battery of 3.6v - don't know how 
much Ah it is (can this be the problem ?)

2. Retraced two black traces on the computer/battery board (I can't 
see any corroded traces / parts other than those)

3. Replaced all 4xxx ICs in the synth board as I found a staple 
between the legs of one of them.

4. Cleaned the corrosion of a few traces on the oscillator board, 
these are the traces that are placed under the coputer board, right 
under the bettry position.

Any directions / idea ?

Thanks
 



--- In PolySix@yahoogroups.com, "gil_we" <gil_we@y...> wrote:
> 
> Thanks !!
> 
> I made a search here and found that by the Polysix service manual,
> VR1 on the computer board is supposted to be responable for the 
reset.
> 
> I changed VR1 setting on the Trident and now the leds/banks seems 
to 
> work OK ! i.e they do not lite up contantly as before, but acts 
what 
> seems to be normally (I can select presets / write)
> 
> Still I find that the Synth section plays hiss and noise (no 
sound) 
> as well as the brass section.
> 
> The Strings section seems to function (beautiful sound !) as well 
as 
> the effects (flanger, vibrato, ensemble, bowing, joystick)
> 
> The sting section even sounds quite tuned (surprisingly...)
> 
> So now the main problem is the misfunction / silent of the brass 
and 
> synth section.
> 
> I'll retrace the other what-seems-to-be bad traces on the other 
board 
> (voice?) and see if that helps.
> 
> Any other ideas at the meantime ?
> 
> Thanks !!
> 
> 
> 
> 
> 
> 
> --- In PolySix@yahoogroups.com, "Chromatest J. Pantsmaker" 
> <chromatest@g...> wrote:
> > 
> > ----- Original Message -----
> > From: gil_we <gil_we@y...>
> >  
> > > Also, I can see a few partially black traces on the KLM-379B 
> board,
> > > right at the place that is below the battery.
> > 
> > I'd start here.  Get a nice voltmeter and visually and 
mechanically 
> trace all of the darkened traces.  I bet a couple of those are 
> hosed...