OBERHEIM SYNTH

I've just purchased an OB-3 from ebay with a few problems. 1st off, I 
was wondering if anyone here in Oberheim-land had a service manual for 
this thing? I've already talked to a friend at Gibson Service who told 
me I'd have to go thru Viscount Organ and wished me luck. As the guy 
has stated, it started out as stuck notes, then it would freeze up. 
Now, there's no lights or sound except for what he thinks is 
transformer hum. I should be receiving it in the next few days. Anyone 
have any ideas of what it might be? Also, who owned and made Oberheim 
at the time this came out? 
I appreciate any help I can get on this.
Bill