Korg Poly800/EX800 Users

More progress (or non-progress):

I got me another Poly-800; this one is actually working (except a display
problem); and so this gave me the chance to swap certain components around.
Ironically, this third Poly is again a different revision compared to the
other two...

As I wrote earlier, one of the Polys seems to have problems with the RESET
circuitry. By moving a few key components between the working machine and
the non-working one I was able to find out the following:

1. RESET voltage is around 1.7 volts instead of 5 volts.
2. IC40 is not the culprit.
3. DTC2 is also working (in the sense that the component is not blown).

HOWEVER:

4. When removing DTC2 from the non-working machine I get a proper RESET
voltage of 5 volts.

So, does that mean anything? Could it be that the 6116 is responsible?


-- 
Malte Rogacki