Korg Poly800/EX800 Users

Thanks for the help, i am using a SEGA power supply that I picked because it 
seemed quite hefty (1.2 Amps) and had been sugested in another thread >>

http://launch.groups.yahoo.com/group/korgpolyex/message/1210

Stock it is tip-neg ( +C- ) the cap "C" being the barrel in the diagram on 
the PS.

I see here>>  http://launch.groups.yahoo.com/group/korgpolyex/message/2041

that there is some connection between problems with the 9volt input and the 
headphone jack not working.


Thanks for the input.





>From: Marcus Wilson <JB@...>
>Reply-To: korgpolyex@yahoogroups.com
>To: korgpolyex@yahoogroups.com
>Subject: Re: [korgpolyex] 9-volt dc in and headphone out not working.  
>Related?
>Date: Fri, 28 Sep 2007 06:21:56 +0800
>
>the 9V dc line is designed to disconnect the battery power when the  ac 
>adapter is plugged in, (not powered, just plugged in)
>
>this is a mechanical make/break as part of the socket design, and is  
>working as expected.
>
>note that the Ac adapter needs to be tip negative, not tip positive  as 
>most ac adapters are.
>
>its very easy to check with a multitester which way around the power  
>supply is configured, and most even have it printed on the ac adapter.
>
>the ac adapters i use are generic brand 9V 450ma ones, and i have  reversed 
>the polarity by cutting and re-soldering the lead to the plug.
>
>that your unit works on batteries tells me that the adapter is most  likely 
>the cause.
>
>there is some reverse voltage protection in the korg, via a zener  diode, 
>which will short the incorrect polarity out of the unit, but i  wouldnt 
>suggest leavin it plugged in like that,
>
>and better to make sure the adapter is actually tip negative 9V  before 
>plugging it in
>
>best regards,
>
>Marcus Wilson
>
>On 28/09/2007, at 5:14 AM, funkymonkeypeter wrote:
>
>>I just got a Sega 9v PS as sugested in a previous post. When i plug
>>it in though the unit will not turn on. Even when there is no A/C
>>going to the P/S the POLY will not turn on even with batteries 6
>>C-cells installed. As soon as i unplug the 9volt DC line it will
>>power up. I get the impression that this might also be related to the
>>fact that the headphone out does not work as well (line outs work
>>fine). Is this an easy fix or should I just put in a DTDP switch to
>>go from batteries to DC in?
>>
>>Thanks.
>>
>>
>>
>

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