Korg Poly800/EX800 Users

hi:

i just recently got an EX800, and i was told that the battery needs 
replacing which is why i haven't been able to save patches o 
sequences.

ok... fair enough, but WHAT sort of battery do i need to get and 
where can i find it ?


thanks

j

email about Korg poly 800 Battery Installation

 

 

Well it just DEPENDS !!! :)  Bet you've heard that one before !

 

Two ways to go......if your a 'Do-itself'er" that is, which I am ,in

the extreame....(currently Revearse Engineering the Firmware

in the Poly 800, etc....plus some 'Extreame' Mods to the 

circuitry, etc,....blah )

  One is to solder to a couple of 'Pads' available on the Main PCB

intended to hold a battery clip, a place located inbetween IC18 and 

IC19..... such as these plastic battery holders...

Radio shack used to sell these, but perhaps no longer...depends

in what part of the USA you are in......this is one of those 

low-profile types intended to hold the really thin type Battery

CR2025 a  3&1/2 volt Mercury Cell. From Energizer

...another is Matsushita Lithium BR2320\ufffd.another is

Maxell  CR2025\ufffd.another is Toshiba Lithium CR2032\ufffd

could be  many other types available that produce 3 to 3.5v, 

more i am sure...this one is about the size of 1/2Dollar, maybe

smaller, but larger than a quarter......anyway....

 

Another path you can take is to buy the more readily available AA cells,

two of them in series is only 3 volts, which works  but 3 of them is 4&1/2 volts

which is even better, since the Chip they power is normally held at

5 volts when powered by the wall circuit.....So this would call for

one of those battery holders that hold 2--3 (no more !! ) AA cells, then

wire that with the +Positive to the top rail of the PCB....by that

I mean refer to attached photo.....its the high-order pin of most

chips that the voltage goes into...in this case an 6116 RAM chip in

socket # IC21 pin 24 its rightmost corner pin across from index pin 1

if you know chips, then forgive my crude attempt to picture it...rather

rely on the photo....

 






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