I have exactly the same problem. Changing the two 74LS08, the 5514 RAM
(Replacement:2114) and the D/A-Converter below the RAM doesn´t help. I
strongly believe that the 8048 Microcontroller is defect (maybe some
defect I/O-Lines). I´ve taken another 8048 from another old defect board
but the Symptoms were the same. I´ve also taken another Knob Board,
another Cables andandand but that didn´t help too.
The Symptoms on my Polysix are:
All Knobs except Bend, Octave, Loudness, EG Intensity and the Effect
Section doesn´t work. The Programmer is o.k., even Tape-Load and write
works (so seen, but programs won´t 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´s complete on. My board has also many broken
Traces where i´m 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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