Panasonic SC-HT720 Home theatre, need info + schematics

I purchased this Home Theatre in USA and so its 120VAC, took it to my country (Argentina) where we use 220VAC. Accidently powered the equipment directly , and so now have no audio output (although all commands on the DVD/tuner player work OK). I have been told that the Audio Power Module may be blown (RSN311W64B) however its dificult to believe that ther is no DC regulator between power supply and Chip's DC voltage. question is how can I get the circuit schematics of the unit (subUffer) Thanks! Thanks

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