Korg Poly800/EX800 Users

For now, I have left the power supply with the jack on it's own, but when I tested it with an external 9V output, pin 6 on the first set of connectors does not give 5V but rather 9V so something is definitely wrong there. If somebody knows what to look for, let me know.

I have temporarily hooked a 9V external supply to the battery leads by extending the latter and soldering to the extensions. 

2 fingers burnt but still soldiering on :P

Yash

--- In korgpolyex@yahoogroups.com, "7yash" <josh.nursing@...> wrote:
>
> Hi all, just got a second-hand, quite battered Poly-800.
> 
> As you expect, it has the lost or randomized patches issue.
> 
> It also has an issue with the power supply: it won't turn on with the external power supply. I managed to turn it on with the internal battery leads connected to a 9V battery initially.
> 
> Now, what it does is it will sometimes turn on (sometimes not) and only for a few seconds on internal battery - anything from 2 to 10 seconds. This is, of course, annoying, since it's not even enough to play back the factory patches in Tape Mode.
> 
> I have searched a lot on the forums including this one, have replaced the Q1 transistor with a new PNP. I have yet to try changing the nearby Zener diode (9/10V).
> 
> I just bought a multi-meter (it's analog) and a continuity tester, have plenty of replacement parts, also downloaded the schematics and read everything on this forum concerning battery issues.
> 
> Have been going through the service manual testing procedure. Currently, even with the VR1 trim-pot adjusted to the max, there doesn't seem to be enough voltage.
> 
> Any guidance would be thoroughly appreciated.
> 
> Yash
>