Pioneer A-656 schematic needed

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Hello, here I got blowed Pioneer A-656 (Not Mk-II) amp. Seems like previous repairs of unknown specialist gave a result with removed parts in one channel. I`ve managed to repair pre-amp, that works correctly and seems like one channel works too, but other doesn't and it is not identical to the first one.

Maybe someone has its service manual or schematic?

Thanks & Happy X-Mas 🙄
 
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