Looking for service bulletins and schematics for JVC MODEL# CA-HXZ1

I'm looking for any service bulletins for my sons JVC portable stereo, model# CA-HXZ1 SERIAL# 087C4407 The unit functions properly in all aspects except that there is no sound coming from the speakers. It loads the CD's and plays them as indicated by the led's but no sound. I'd appreciate the help. JVC is no help at all.

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