Other Functions; Using Optional Equipment; Auxiliary Audio Equipment - Sony MEX-BT3900U Operating Instructions Manual

BTM (page 15)
AUTO ANS*
1 (Auto Answer)
Answers an incoming call automatically.
– "OFF": to not answer automatically until
(handsfree) is pressed.
– "1": to answer automatically after 3 seconds.
– "2": to answer automatically after 10 seconds.
RINGTONE*
1
Uses the ringtone of this unit or the connected
cellular phone: "1 (this unit)," "2 (cellular
phone)."
BT INIT*
1 (Bluetooth Initialize) (page 27)
*1 When the unit is turned off.
*2 When FM is received.
*3 When the audio output is set to "SUB-OUT" or
Rear Bass Enhancer is set to other than "OFF."
*4 When the audio output is set to "SUB-OUT."

Other functions

Using optional equipment

Auxiliary audio equipment

By connecting an optional portable audio device
to the AUX input jack (stereo mini jack) on the
unit and then simply selecting the source, you
can listen on your car speakers. The volume level
is adjustable for any difference between the unit
and the portable audio device. Follow the
procedure below:
Connecting the portable audio
device
1 Turn off the portable audio device.
2 Turn down the volume on the unit.
3 Connect to the unit.
* Be sure to use a straight type plug.
Adjusting the volume level
Be sure to adjust the volume for each connected
audio device before playback.
1 Turn down the volume on the unit.
2 Press (SOURCE/OFF) repeatedly until "AUX"
appears.
After that, "AUX FRONT IN" appears.
3 Start playback of the portable audio device at a
moderate volume.
4 Set your usual listening volume on the unit.
5 Adjust the input level (page 28).
Connecting cord*
(not supplied)
31