[sdiy] KORG DW 8000 Issue

[paul.maddox.mail-list at synth.net]

Pedro,

   Ok, if OSC1 is working (all pitches correct? and all voices  
working?) and you can only select one waveform (sawtooth), I'd suggest  
you have some dead bits on the control channel lines.
   the 74S189's are VERY prone to dieing (PPG uses the same system for  
it's oscillators), so that would be the first thing to check in my  
book. You can see more about the PPG Prozboard (basically the  
oscillator section) here - http://www.ppg.synth.net/faq/proz_fault.shtml

  I would expect one of 74s189s will hold the wavenumber (16 waves in  
eth DW8000 and it's a 4bit RAM chip). Though I can't tell you which  
from a short look at the schematics.

   These 73s189's are like rocking horse sh1t, almost impossible to  
find, I'd suggest grabbing a dead DW8000 and pulling the chips from  
it, remove the old chips, socket the spaces, and narrow down the dead  
one by swapping them in and out.

  paul



> My KORG DW 8000 's DCO came to death. Every functions working exept:
> Just 1 osc give (from two) sound and only SAW waveform. The transpose
> is not working. Some of the SAW-s from 8 polyphony sounding harsh..
>
> Please help me to get DWGS DCO for it!
> Maybe just The Wavetable ROM wounded. And the waveforms deleted.
>
> The service manual is here!
>
> http://www.pallium.com/bryan/dw/DW-8000_Service_Manual.pdf
>
> On this pdf at 28 page. There is some RAMS or ROMS but i am not shure
> what exactly i want, to get it work properly!
>
> Thanks!
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