This Receiver has a loop on the back that connects to pre-amp.
Make sure these loops are connected for stand-alone.
Also has 4 fuses..2x4 amp and 2X5 amp..if any of these are blown..suspect R or L output..one side or both.
Repace with NTE37 and/or NTE38.
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Schematic
I have inspected the curcuitry and there is a couple of resistors damaged and the power transistors are heating up extremely quick with nothing hooked up, is there a schematic available?