6.1 Receiver Excellent Value How Do I Fix My Sony STR-DE 597 6.1 Receiver?

How do i fix my sony STR-DE 597 6.1 receiver? - 6.1 receiver excellent value

the sound of "protection" keeps popping up in my stereo. Manual says that is turned off when an irregular flows from the speakers and receiver. I disconnected the speakers and check the wiring and still had the audio to be protected. Then he said that all the memory / configuration and did not. I called Sony and they told me at the receiver for 30 minutes and then drag it to a technician if it does not work.
How do I solve this problem to protect "the problem?