Korg Poly800/EX800 Users

IIRC there is a small trimpot on the PCB. This seems to be a voltage trimpot for the logic circuits. I had an old MKI that I brought out of closet chowder status withthis fix. I cant recall which trimpot it is off  the top of my head.(there are several) Anyone else?

Geez... you guys are gonna *love* this:

Dreading the thought of having to trace my way through the current
paths of the circuitry looking for anomalies, I resorted to the time
honoured 'rapid decelleration' repair technique I learned from
watching guitarists fix their Traynor amps onstage (mid set).

I picked the damned thing up about 6 inches off the bench, holding it
nice and level, and dropped it.

Worked like a charm... programs intact and everything.  Go figure.

Currently rummaging through the parts bins for audio taper pots... got
some mods to do, don't I?

Thanks for all your help, guys... 

Kaden

Kaden wrote:

> I picked the damned thing up about 6 inches off the bench, holding it
> nice and level, and dropped it.

I can't find my scanner.  However, if I could, I'd scan the part of the 
Apple II manual that suggest you drop it from a height of about 6" onto 
the bench to reseat all the socketed chips.  The more things change... 
Although I suppose the Apple II and the Poly 800 are approximately the 
same age (same decade, anyway).

Gordon

On Wed, 2008-08-27 at 07:44 -0700, electrohead2000@... wrote:
> I love it!!!!
> I used to have an Akai s-1000 that needed regular "altitude
> adjustments"

Atari STs were good for that too.  You also had to be careful to keep
them level and not bump them if they'd been on all day, because the
power supplies got hot enough to desolder a lot of the components.  If
you turned them upside down, the power transistors would drop out of the
board...

Gordon

--- In korgpolyex@yahoogroups.com, "Gordon J. C. Pearce" <gordon@...> 
wrote:
>
> On Wed, 2008-08-27 at 07:44 -0700, electrohead2000@... wrote:
> > I love it!!!!
> > I used to have an Akai s-1000 that needed regular "altitude
> > adjustments"
> 
> Atari STs were good for that too.  You also had to be careful to keep
> them level and not bump them if they'd been on all day, because the
> power supplies got hot enough to desolder a lot of the components.  If
> you turned them upside down, the power transistors would drop out of 
the
> board...
> 

The trick works on devices with chips that are socketed, because heat 
causes the chips to work their way out of their sockets, and dropping 
it resets them.  I think that anything hot enough to desolder a chip 
would also destroy it.  My ST gets hot, but hot enough to desolder 
components?  Sounds very far-fetched...