[sdiy] CR-78 help

[SRRecords at aol.com]

Hello all.  A dream of mine finally came true: a roland CR-78!   Cosmetically 
it is gorgeous.  Problem.  It makes no sound (yes, that  IS a problem!)....
 
it powers up, and the lights come on (sort of/sometimes, usually).  I  hear a 
buzzing sound when plugged into the mixer. That's it.
 
Any recommendations on what to look for or with what might be wrong?
 
Thanks,
 
JM
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