Yamaha YAS-408BL Owner's Manual page 58

Noise is heard
l The unit is too close to another digital or high-frequency
device.
Move those devices away from the unit.
When any problem appears
(Bluetooth®)
The unit cannot be connected to a
Bluetooth® device
l Bluetooth is not selected as the input source.
Select Bluetooth as the input source. For details, see the
following:
– "Listening to music stored on a Bluetooth
l The unit is too far away from the Bluetooth device.
Move the Bluetooth device closer to the unit.
l A device emitting electromagnetic waves (such as a
microwave oven, a wireless device and so on) may be located
nearby.
Do not use the unit near devices that emit electromagnetic
waves.
l The Bluetooth device you are using may not support the
A2DP profile.
Use a Bluetooth device that supports the A2DP profile.
l The connection profile registered in the Bluetooth device may
not be functioning correctly.
Delete the connection profile in the Bluetooth device, and then
connect the Bluetooth device to the unit.
l The passkey for devices such as a Bluetooth adapter is not
"0000".
Use a Bluetooth device with a passkey of "0000".
l The unit is already connected to another Bluetooth device.
Terminate the current Bluetooth connection, and then connect
to the new device.
58
En
® device" (p.32)