Discussion about the Korg PolySix synthesizer

Hi polysixers,I'm new here.
I've just 'inherited' a Korg Polysix, which however dosen't work. Now 
I could take it too repair shop - but as I don't/they don't know 
what's wrong with it(until I take it in),I have no idea what it it'll 
cost me, and I'm on a v.tight budget at the momment! It's previous 
owner said (a few years ago) that there's he was told it would cost 
£100 to fix. 
 I might have a look at it myself with perhaps help from my'friends 
electric' and internet wisdom. 
Any advice/tips?
Also dya know where to get a hold of a manual-online perhaps?
And is the midi thing worth doing?
Thanks for any help
Den