Sony MEX-BT3900U Operating Instructions Manual page 37

Connection is not possible.
• Connect to this unit from a Bluetooth device or vice
versa. The connection is controlled from one side
(this unit or Bluetooth device), but not both.
• Check the pairing and connection procedures in the
manual of the other device, etc., and perform the
operation again.
The name of the detected device does not
appear.
Depending on the status of the other device, it may not
be possible to obtain the name.
No ringtone.
• Adjust the volume in "VOL RING" level.
• Depending on the connecting device, the ringtone
may not be sent properly.
t Set "RINGTONE" to "R.TONE-1" (page 24).
The talker's voice volume is low.
Adjust the volume level.
A call partner says that the volume is too low
or high.
Adjust the volume accordingly using Mic Gain
adjustment (page 25).
Echo or noise occurs in phone call
conversations.
• Lower the volume.
• Set EC/NC Mode to "EC/NC-1" or "EC/NC-2"
(page 25).
• If the ambient noise other than the phone call sound
is loud, try reducing this noise.
E.g.: If a window is open and road noise, etc., is loud,
shut the window. If the air conditioner is loud, lower
the air conditioner.
The phone is not connected.
When Bluetooth audio is played, the phone is not
connected even if you press
t Connect from the phone.
The phone sound quality is poor.
Phone sound quality depends on reception conditions
of cellular phone.
t Move your car to a place where you can enhance
the cellular phone's signal if the reception is poor.
The volume of the connected audio device is
low (high).
Volume level will differ depending on the audio
device.
t Adjust the volume of the connected audio device or
this unit.
No sound is heard from the Bluetooth audio
device.
The audio device is paused.
t Cancel pause of the audio device.
(handsfree).
The sound skips during playback of a
Bluetooth audio device.
• Reduce the distance between the unit and the
Bluetooth audio device.
• If the Bluetooth audio device is stored in a case
which interrupts the signal, remove the audio device
from the case while using.
• Several Bluetooth devices or other devices which
emit radio waves are used nearby.
t Turn off the other devices.
t Increase the distance from the other devices.
• The playback sound stops momentarily when the
connection between this unit and the cellular phone is
being made. This is not a malfunction.
The connected Bluetooth audio device cannot
be controlled.
Check that the connected Bluetooth audio device
supports AVRCP.
Some functions do not work.
Check if the connecting device supports the functions
in question.
The name of the other party does not appear
when a call is received.
The calling phone is not set to send the phone number.
A call is answered unintentionally.
• The connecting phone is set to answer a call
automatically.
• "AUTO ANS" of this unit is set to "A.ANS-1" or
"A.ANS-2" (page 24).
Pairing failed due to time out.
Depending on the connecting device, the time limit for
pairing may be short. Try completing the pairing
within the time.
Bluetooth function cannot operate.
Turn off the unit by pressing (SOURCE/OFF) for more
than 2 seconds, then turn the unit on again.
No sound is output from the car speakers
during handsfree call.
If the sound is output from the cellular phone, set the
cellular phone to output the sound from the car
speakers.
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