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Subject: RE: [korgpolyex] Re: memory backup battery mod

From: "backshall1" <backshall1@...>
Date: 2012-11-15

Yes, that is correct. You can still powerthe Poly-800 from C-cells, but the connection from those batteries to thememory chip is gone when you turn the synth off. When the synth is on, thememory chip will still get +5v power through D23 so you aren’t using the lithiumcell while you are playing.

 

Don B

 

From: korgpolyex@yahoogroups.com [mailto: korgpolyex@yahoogroups.com ] On Behalf Of AARON
Sent: Wednesday, November 14, 20125:22 PM
To: korgpolyex@yahoogroups.com
Subject: [korgpolyex] Re: memorybackup battery mod

 

 

Hi all,

I hate todredge up an old thread, but I'm considering doing the battery mod on myPoly-800 Mk I, too. 

Just tobe clear, if my synth DOES have the large solder "islands" in themiddle of the board (which I believe it does), I do the following: (1) removeR1 completely; (2) remove D1 completely; and (3) solder the battery into the"islands" in the middle of the board; (4) remove the old C-cells andbe a happy camper until the lithium battery dies.

Is thatcorrect?  If so, I'm headed to Radio Shack to get that CR2032 andholder!  \":)\"

Thanks!  

Aaron

--- In korgpolyex@yahoogroups.com , Michael Hawkins<korgpolyex800@...> wrote:

>
> 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 ofthe 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 ontothem. But I think it is much better to take the main board out and remove thecomponents completely and then solder the wires in to the vacated holelocations.
>
> 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 photosetc.
>
> 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 toidentify the missing battery area (I'll do a side by side comparison shot ofbattery 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 thefiles here and found the mod text, but after having looked over the schematicsI 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 asmuch as possible of the D1 legs, see next steps.). The battery must then beconnected by wires, the plus to the junction between R1/D1 and the minus to theother 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 doingany cutting/soldering.
>
> Thanks in advance.
>
> Vic
>