I recently moved and set up my 5.1 surround system and replaced my DVD with a Blu-ray using the same optical output cable. I recieve an overload error followed by shutdown. Turning the sub off did not help, but turning the input attenuator on seemed to temporarily solve the issue. If kept at low volumes the receiver does not overload. My guess is the output on the sony blu-ray is too much, or a short in the speaker wiring? All speakers seem to work fine with no static.
Overloads are generally heat- or current-related. Digital inputs don't have adjustments (all 1's is as high as they go), so I doubt there is any relationship between the Blu-Ray's optical cable and the overload.
You've said what doesn't affect the problem, so what's that leave? I'd look at shorts or mismatches between the amps and the speakers.
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I just wanted to update what I found to be my problem. I thought I posted this before, but my problem was a short between touching wires on one of the satellite speakers. One had fallen and when I put it back up I had twisted the wire, thus pulling it out some and shorting the system. No fault until the power was increased.
*UPDATE* Just as I had suspected the culprit was a short in one of the speakers. I had a satellite speaker fall off its mount, and it was twisted when put back up, thus pulling the wire out some and causing the short and resulting fault.
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