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I had the same problem with my TX-SR601 receiver. Solution: I changed the
capacitor C766 (100uF/6,3V) on the "DSP and main microprocessor" or "U1" board. This
capacitor is responsible to keep the settings in the memory. It is directly
next to the SRAM ICs (Q705-706) (type: CY7C1019BV/CV33-15VCT).
Now the receiver works properly again.
The output transistors should be replaced in pairs. Also, It may not be just the output transistors that are defective. If you have no experience with these types of repairs, I would suggest that you bring the unit to a service shop. The outputs will run about $15-$25 per pair.