Vogel's SAVA 1001 Mode D'emploi page 14

My Bluetooth headphones are connected, but I do not hear
any audio.
Please ensure that your audio source (TV or computer) is
connected to the SAVA 1001's audio input.
Please ensure that the multifunctional switch is in the correct
position (AUX or OPT).
Please ensure that your audio source is playing music and the
volume is set to "high".
Please ensure that the volume on your headphones is set
correctly.
If you are using an optical connection, please ensure nothing is
connected to the aux input.
My smartphone is connected to the SAVA 1001, but I do not
hear any music through my audio system.
Make sure that your audio system's audio input is properly
connected to the SAVA 1001's audio output and the TX/RX switch
is in RX mode.
Please ensure that the multifunctional switch is in the correct
position (AUX or OPT).
Check that the volume of your smartphone and the app you are
using are set correctly.
If you are using an optical connection, please ensure nothing is
connected to the aux input.
Low volume level.
In TX mode: check the volume on both your Bluetooth
headphones and your TV, as both may be able to adjust the
volume.
In RX mode: check the volume of your smartphone and the app
you are using. Also check the volume of your audio system.
I connected my SAVA 1001 to the headphone jack of the TV
and use my TV's USB port to power the SAVA 1001, but I hear
a 'buzz' in the audio.
Please use a USB adapter to power the SAVA 1001, or use your
TV's Toslink connector. In your TV's settings, please ensure that
Toslink is set to PCM Stereo.
© VOGEL'S
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