Korg Poly800/EX800 Users

thanx for quick reply, Don.
For sure I meant D23, just a typo. So i'm glad I assumed to leave these 
components in place.

Many thanks for mentioning R1 and D1, I should have taken a look in the file 
"poly8batt" found in my folders which says the same. From the schematics I could 
not see that these 2 components are connected with the battery. I have to tell 
Ricard, since he did not mention these 2 on his website. If a lithium cell 
overheats and burns, it possibly will emit hydrofluoirc acid - this requires 
immediate medical attention on exposure!

 bye,
Dietmar




________________________________
Von: backshall1 (dsl) <backshall1@...>
An: korgpolyex@yahoogroups.com
Gesendet: Sonntag, den 13. März 2011, 23:24:29 Uhr
Betreff: RE: [korgpolyex] Re: battery on Poly-800

   
The capacitors can't hurt anything, although they are a  bit redundant. C88 is 
actually useful to hold the patches during a quick battery  change. You said 
C23, but I assume you meant D23. D23 is good, since it allows  the memory to use 
the regular 5v supply instead of the lithium cell when the  synth is turned on. 
Do not remove it. D15 is required to protect the battery  from being charged 
from the regular 5V supply.
 
On the other hand, there are a couple of parts that do  need to be removed: R1, 
D1.
R1 must be removed to prevent the voltage from the AC  adapter from getting to 
the lithium cell.
D1 must be removed to prevent the voltage from the  C-cells from getting to the 
lithium cell. A CR2032 lithium battery is not  rechargable and could overheat 
and burn if R1, D1 are not  removed.
 
Don B


________________________________
 From: korgpolyex@yahoogroups.com  [mailto:korgpolyex@yahoogroups.com] On Behalf 
Of microbugix
Sent: Sunday, March 13, 2011 4:22 PM
To: korgpolyex@yahoogroups.com
Subject: [korgpolyex] Re: battery on  Poly-800

  
I now have opened my 800 too and spotted a version with solder pads, but no  
battery. Richard (www.analog.no) says, one should remove C87, C88 and C23. After  
examining the schematics at this point, I cannot imagine why this components  
should be removed, since the two condensors help avoiding spikes and losing  
memory when changing the battery and the diode protects the battery from being  
charged if the poly 800 is powered from the batteries in the compartment of the  
bottom. Or am I completely wrong there?

--- In korgpolyex@yahoogroups.com,  "backshall1 \(dsl\)" <backshall1@...> wrote:
>
> Depending on  the version, this Poly-800 may not have an internal battery at
> all. It  would be on the CPU board between IC18 and IC19 if it has one. If it
> is  really old, this will be just empty space. If it is a bit newer, it may
>  have solder tabs where the battery would eventually go, but no battery.  The
> last ones manufactured just before the Poly-800 II actually had a  CR2032
> lithium cell soldered in there. I this is one of the earlier two  types, it
> would need some small modifications to the power circuit to  safely install a
> CR2032
> 
> Don  B.
>