Korg Poly800/EX800 Users

----- Original Message -----

From: tyrone_topheavy

To: korgpolyex@yahoogroups.com

Sent: Monday, November 24, 2008 8:04 PM

Subject: [korgpolyex] Poly 800 problems, IC

Hey all.

I just rec'd a Poly 800 from "that auction place". In the past, I've
relaced the battery and uploaded the new sounds from my PC through
the tape jack, and I assumed this would be the problem with this one.

First, this is an early model, so no battery.

Second, I looked at the IC NJM2069D3004, and noticed it appeared to
be installed backwards, as it's "key" (the indentaion on the chip)
was opposite of all the other ICs on the board. So, I pulled it, and
observed some of the legs were missing or bent. Someones obviously
been here before me.

Also, I noticed several jumpers on the board that seem to be mods or
repairs. IC 24 has two of it's pins jumpered (20 to 23) IC 22 has
been jumpered to IC 24, and two capicitors are also jumpered (C95 to
C97).Lastly, the wiring harness that connects the main PCB to the
smaller brown one under the front panel appears to have had some
modification to it. Pins 1,2,3 and 4 on CN6A seem to have been
spliced.

I know the guy that makes the Hawk kits hangs out here, and you guys
know more about this synth than anyone. Do these mods look farmiliar
to you ? Can you tell me what someone was trying to do ? Is it
reversable ? Can I just break the jumpers ?

Also, since the pins on the IC are bent/missingm are there
replacements avaialable ? I've read elsewhere the EPROM can be
burned, and the data is on the net, but I have neither the equipment,
expertise not patience to burn my on ICs.

Or, is this a candidate for the trash pile ? I could always part it
out, I guess...

Thanks in advance for your help. This is a neat little grouop you
have going here.