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i dont have schematic for your audio system but ther is schematic for models
vsx-508 and vsx -511 and i think it will help you bcz mthe models name are closley like the one u want and i think this seris have the same components and schematic (90% the same)
go to this link
well , i'm not working in audio repair but may help searching ur schematic or manual .
in TV and Monitor Repair we have chassis that hosts many other models so if we got any model it works for others , so if u know any other models that similar to yours , list them here and we'll try to find any that can help u.