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Subject: Re: [korgpolyex] memory backup battery mod

From: Michael Hawkins <korgpolyex800@...>
Date: 2009-06-10

Hi Vic,

The positive side of the button battery should be soldered to the junction between R1 and D1 and the negative side should be soldered to the other side of the diode D1.

The mod document is trying to say that you can just clip the diode and resistor off leaving enough length on the legs to solder the battery wires onto them. But I think it is much better to take the main board out and remove the components completely and then solder the wires in to the vacated hole locations.

If you could do me a favor and send me photos (again - sorry), I will convert the battery mod text file into a much better PDF version with photos etc.

So send me a photo showing the main board number KLM-596-2 and including the area where the battery ought to be. This will help other Poly owners to identify the missing battery area (I'll do a side by side comparison shot of battery missing and battery in place).

And also send me a close up of the power regulation area including D1 and R1. I'll use them to improve the button battery addition instructions.

Mike.

From: synther2000r <synther2000r@...>
To: korgpolyex@yahoogroups.com
Sent: Tuesday, June 9, 2009 10:05:26 PM
Subject: [korgpolyex] memory backup battery mod

Hello everyone.

I hope y'all don't mind if I begin my first post with a question. I have a Poly800 mk1 that I'd like to add the battery backup mod. I looked through the files here and found the mod text, but after having looked over the schematics I came across something I don't understand.

In the text the instructions read "In the upper left corner you'll find Resistor R1 and Diode D1. Remove these. (Just cut the legs, but leave as much as possible of the D1 legs, see next steps.). The battery must then be connected by wires, the plus to the junction between R1/D1 and the minus to the other leg of D1."

I may be missing something but since R1 is no longer on the board, where is the + voltage of the battery going?

Just to be clear, I haven't opened my Poly 800 up yet to check the traces. I'd just like to be certain that I have the instructions correct before doing any cutting/soldering.

Thanks in advance.

Vic