To check protect mode: what kind of protection it belongs to when NG channel is displayed such:
NG:LCRSLSRBLBR
NG__CH:LCRSLSRBLBR
1.Press the Enter button
2.Protect cause are displayed for 5 seconds.
DET.PROTECT:I(overcurrent)
DET.PROTECT:V(dc detected)
If warranty still have,call onkyo to repair.
Search you tube SR600 cap replacement and send an email to me, if you want to repair it by yourself.
SOURCE: Powered Or Unpowered Subwoofers For Onkyo TX-8511
Greg- Powered subs are better than non-powered subs (also known as passive subs), anyway I see the TX-8511 has no sub pre-out on the back panel, so you need to decide what sub you will use and run from the receivers left and right speakers output into a subwoofers speaker in from speakers then back out to speakers, look at the back of a subwoofer and you will see like 4 sets of speaker hookups 2 in and 2 out, what this does is takes the low end or bass and drops the signal to the subwoofer then takes the mids and highs out to your left and right speakers, unless your regular left and right stereo speakers have large woofers a sub is the way to go.
SOURCE: how powerful loudspeakers can my Onkyo TX-SV444 tackle, maintaining good sound?
buy 6ohms or 8 ohms speakers. 4ohms consume too much power and sometimes causes short circuit. (safety first!)
SOURCE: Onkyo TX-SR701 Digital audio port stopped working
you may want to try a factory reset by pressing and holding vcr1 button while pressing the power button. do this with the unit on. It will reset back to factory default. so any saved setting will be lost and you will have to set again to your settings.
SOURCE: Onkyo TX-DS898 Memory Loss
THEY USE A MEMORY CAP.ITS LOCATED ON THE MAIN PCB ASSEMBLY, REF. C7701 ONKYO PART NUMBER IS 3000078/ WITH THE UNIT TURNED OFF MEASURE THE VOLTAGE YOU SHOULD HAVE APPROX 5V IF NOT THE CAP IS BAD. ALSO MEASURE WITH UNIT ON AND YOU SHOULD ALSO MEASURE 5 V IF NOT THEN THE SUPPLY VOLTAGE GOING TO THE CAP IS BAD.
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