My TX-SR603X shuts off at higher volume levels. This has happend before but went away. It is now doing it again. I also tried doing to automatic set up with the mic. When it got to the left rear speaker, it shuts off. I tried unhooking this speaker but it still happens. Any suggestions please?
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Depending upon the type of power outage, you may have more of a confused receiver than a defecive one. Try unplugging the unit for an hour or so to see if that resets the whole thing back to "normal". If not, then further investigation with a scope or logic analyser will be required to determine whether the problem is with the internal CPU or a defect on the data lines. Unless the reset works, this is not likely to be a DYI repair.
If you have zone 2 active with the level turned up too much it will cut out the whole unit. Try disconnecting zone 2 speakers, then turn the volume level way down on zone 2 and it should stay on if that is the problem.
When I initially bough mine, I had the same problem. It wouldn't shut down, but occasional popping sound on the center speaker. Turns out the impedance on the speaker was 4 ohms, not not 8. Replaced center with an o 8ohm speaker. This receiver is not reated to run 4 ohm speakers. If I had problems with 1, I can only imagine what kind of problems could happen if all the speakers were 4-ohms.