Follow these steps:
*disconnect everything from the unit (treat it as if you just got it out of the box) no speaker wires no cables.
* turn on the unit and max the volume (w/o anything connected)
*if the unit shuts off during step 2 you need to send it in for service (go to onkyousa.com for the nearest service center)
*if it didn't shut off during step 2 you need to play the tuner and connect one speaker at a time.
EXAMPLE: connect your left speaker and then play the FM and then max the volume for about 2 seconds then turn it down.
if you were successful in maxing out the volume on the left speaker continue with the other speakers until you isolate w/c speaker is causing the issue. if your gonna ask why the FM...its because its a direct playing source but you can still use a cd player or a tape deck to try it out.
take note: if your receiver shuts down on a speaker that you have connected make sure to have that speaker checked or better yet replace it.
Mismatched speakers could lead to this and heat is also a culprit. an service could be duo
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