holding down the CBL/SAT button and press the ON/STANDBY button
http://lifebeginsatforty40.blogspot.com/2022/07/onkyo-tx-rn414-av-receiver-no-sound.html?m=1
http://lifebeginsatforty40.blogspot.com/2022/07/onkyo-tx-rn414-av-receiver-no-sound.html?m=1
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