Yamaha AVENTAGE RXA780BL Owner's Manual page 166

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No sound is produced, or the sound is interrupted
during playback with Bluetooth® connection
l The volume of the Bluetooth device is set too low.
Turn up the volume of the Bluetooth device.
l The Bluetooth device is not set to send audio signals to the unit.
Switch the audio output of the Bluetooth device to the unit.
l The Bluetooth connection has been terminated.
Establish a Bluetooth connection between the Bluetooth device and the unit again.
For details, see the following:
– "Playback Bluetooth ® device music on the unit" (p.80)
l The unit and the Bluetooth device are too far apart.
Move the Bluetooth device closer to the unit.
l There is a device (such as microwave oven and wireless LAN) that outputs
signals in the 2.4 GHz frequency band nearby.
Move the unit and the Bluetooth device away from those devices.
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