My onkyo TX-SR576 turns it self off at times and goes to stand by mode and the stand by light flashs

SOURCE: amp keeps switching off

There is a problem with one or both of the audio amp circuits. The amp is going into a protect mode as to protect and save your speakers. Sorry but there is no simple fix. this will need to go to the shop to be diagnoised. Good Luck

SOURCE: Brand new Onkyo Tx-sr605 won't leave stand by

I just ran into the same problem with my Onkyo SR605. I seemed to 'fix' it by doing a receiver reset to put it back to factory settings. See Troubleshooting pg 94 on upper left. Turn reciever on, I had to set it to an non-functioning channel, then help down the VCR/DRV button and then pressed the standby/on button. Clear appeared on the reciever display. The always-in-standby mode is gone now. (of course, when it might re appear is anyones quess. I noted on webpage that the 605 implemented some integration with other components via HDMI. Am wondering, since my DVD uses HDMI as does my connection to the TV and the PC as well. Is it HDMI bug?

SOURCE: Onkyo TX-SR500 loosing settings

Turning any receiver off will erase the settings - there is no backup battery (Onkyo uses Battery Free Memory Backup) and the length of time depends on the capacitor charge. Why not just leave the receiver plugged in? Stand-by mode uses a negligible amount of power - enough to keep the capacitors charged and the LED on the front panel on.

SOURCE: Hi I have an Onkyo

The unit is in protect mode. A problem was detected in the final stage of the amp and the unit shuts down to prevent further damage to either the amp or speakers. Check the speaker wires to be sure that they are not crossed anywhere. If with the sepaker wires disconnected, the amp still enters protect mode, the problem is internal to the amp. This is usually defective output transistors. Expect a parts cost between $15-$40.

Dan