Discussion about the Korg PolySix synthesizer

I have exactly the same problem. Changing the two 74LS08, the 5514 RAM
(Replacement:2114) and the D/A-Converter below the RAM doesn\ufffdt help. I
strongly believe that the 8048 Microcontroller is defect (maybe some
defect I/O-Lines). I\ufffdve taken another 8048 from another old defect board
but the Symptoms were the same. I\ufffdve also taken another Knob Board,
another Cables andandand but that didn\ufffdt help too.

The Symptoms on my Polysix are:

All Knobs except Bend, Octave, Loudness, EG Intensity and the Effect
Section doesn\ufffdt work. The Programmer is o.k., even Tape-Load and write
works (so seen, but programs won\ufffdt be loaded). When the board is
switched into Test mode i hear a sound. In normal operation i also hear
some sounds but they are in manual mode not changeable. The internal
variable Resistors works, but also the MG-Led flushes first slow and
then faster until she\ufffds complete on. My board has also many broken
Traces where i\ufffdm not really sure if they all work correctly.

Has anyone the ROM-Code from the 8048 or better: A KLM-367 without
Chips?

Greetings

Stef



"comraderecords <comraderecords@bigpond.com>"
<comraderecords@bigpond.com> schrieb am 22.01.2003, 08:20:08:
> Greetings folks. My first post to this marvelous list and I'm hoping 
> for a bit of info.
> 
> I've just bought a Polysix, have opened it up, the battery has 
> already been removed & there are signs of corrosion. I'm aware of the 
> instructions at oldcrows.com but I'm just wondering what improvements 
> I can expect.  Neiter my pitchbend or MG wheel are currently working 
> and many of the knobs and switches aren't working (VCF Cutoff, EG 
> Intensity, complete EG section, MG section works in VCA MOD only, 
> PW/PWM & PWM Speed).
> 
> I presume some of the chips need replacing but are any of these 
> problems likely to be associated with battery leakage?
> 
> Thanks very much!
> 
> Ben.
> 
> 
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