The volume control of your
Bluetooth device is set at too low.
Increase the volume of your
Bluetooth device.
The volume control of the main unit
is set at too low.
Increase the volume of the main
unit to turn to your wish.
USB/TF
No sound in USB/TF mode
Volume at minimum.
Adjust the volume knob.
External device not connected
properly.
Clear contacts pins and connect
again.
AUX
No sound in AUX mode
Volume at minimum.
Adjust the volume knob.
External device not connected
properly.
Clear contacts pins and connect
again.
FM radio
No sound in FM radio mode
Volume at minimum
Adjust the volume.
FM channel is not clear
The FM antenna not untie.
Loosen the FM antenna back of
side, and adjust the external cable
position to get clear channel
