Korg Poly800/EX800 Users

Hello everyone.

It's been a while since my modded Poly 800 has been behaving 
erratically. It will, all of a sudden, power off and on again and in 
the process, it will lose ALL patches, leaving random-generated 
patches (almost all unusable, even with "impossible" values such as 4 
in the oscillator octaves). Has anybody gone thru this before?

I know the mods are not directly related to this malfunction, but as 
the synth is not finally assembled (some screws yet to be tightened) 
I was wondering whether a loose board could be the culprit. One more 
thing: I managed to have the synth open during one of these 
breakdowns and noticed that some of the diodes between DB2 to DB9 
emitted a reddish light. Is this normal?

Thanks in advance,

Dave

On Sat, 19 May 2007, Dave Bowman wrote:

> I know the mods are not directly related to this malfunction, but as the 
> synth is not finally assembled (some screws yet to be tightened) I was 
> wondering whether a loose board could be the culprit.
=====================

having the synth partially assembled won't help this type of problem... 
there's only one way to tell for sure if it's causing the problem.


> One more thing: I managed to have the synth open during one of these 
> breakdowns and noticed that some of the diodes between DB2 to DB9 
> emitted a reddish light. Is this normal?
======================

it's probably nothing to be concerned by. an LED is just a diode that's 
been optimized to produce light... IIRC a "normal" diode may produce light 
when forward biased, and may react to light when reverse biased.


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         ...atom

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Dave,

The connectors used on the Poly are not the most reliable when the
whole synth isn't screwed down and together. So I wouldn't worry about
the reboot problem unless it continues to happen after you put it all
back together.

As Atom mentioned, and to expand a litte, the AD converter smoothing
diodes definitely emit a small reddish glow when the synth is in
operation.

Good luck!

Mike.

Hi Atom and Mike,

Thanks for your quick and sound advice. I did screw everything 
inplace (only before thoroughly brushing the boards softly in order 
to get rid of any possible debris) and hey, i had the synth turned on 
for many hours now and everything is workig fine! I'd say, yay!! Keep 
fingers crossed...

Mike: your work on the code looks so promising... you rock. I only 
wish the MK III will be fully compatible with Atom's mods... I have 
my keyboard drilled and potted already...


Dave

--- In korgpolyex@yahoogroups.com, 
"korgpolyex800" <korgpolyex800@...> wrote:
>
> Dave,
> 
> The connectors used on the Poly are not the most reliable when the
> whole synth isn't screwed down and together. So I wouldn't worry 
about
> the reboot problem unless it continues to happen after you put it 
all

> back together.
> 
> As Atom mentioned, and to expand a litte, the AD converter smoothing
> diodes definitely emit a small reddish glow when the synth is in
> operation.
> 
> Good luck!
> 
> Mike.
>