1-make sure that digital input source is selected.
2-make sure all audio connections are firmly inserted in.
3-all polarity of speakers is correct and no connection of bare wire with metal part of the receiver.
4-check volume control in good level.
5-check for muting indicator and cancel it.
6-headphone is not connected.
7-check the digital audio output setting on the connected device.and make it on.
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