Vintage Synth Repair

I haven't had the hood off yet, and it may be a simple matter, but I 
thought I'd first throw this out to see if anybody had any easy 
answers.  You see, I was playing my Yamaha CP-25 electronic piano with 
my band last night when, suddenly, after a small flurry of crackling, it 
stopped making noise.  I tested all the patch cords and came to the 
conclusion that it was producing no output.  Upon cranking the volume 
and turning to the more piercing harpsichord setting, however, I 
realized that it is still producing notes, but they are extremely weak.  
As everybody raves about the reliability and durability of those old 
Yamahas, I was greatly surprised!  So, anybody had anything like this 
happen or know what's going on?  I guess I'll be looking at the preamp 
section first... P.S. The headphone output is equally weak, I checked 
that too.

BaM

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