The Kawai & Teisco Analog Synths Group

Hi all!
I'm new to the kawai sx210 and I'm not a technician either..The
problem is that I live in Greece and there is not a single place to
get any analog equipment fixed.
The sx210 powers up and makes a continuous sound which you can only
alter its tune. Pressing the keyboard doesn't make any sound..
Does anyone have a clue what should be done?
I read about the battery leaking..is there any possibility this could
be the problem?
Thanks a lot,
Christos Panagiotakis