MEX-BT3900U, MEX-BT3950U, MEX-BT39UW - Sony Car Audio Service Manual (repair manual). Page 5

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MEX-BT39UW/BT3900U/BT3950U
5
NOTE  FOR  REPLACEMENT  OF  THE  USB  CONNECTOR 
(CN902)  AND  THE  AUX  JACK (J901)
To replace the USB connector and the AUX jack requires align-
ment.
1.  Insert the USB connector and the AUX jack into the front pan-
el.
2.  Place the KEY board on the front panel and align the terminals 
of the USB connector and the AUX jack with the holes in the 
KEY board.
3.  Solder the seven terminals of the connector.
MODEL  IDENTIFICATION
Part No.
Destination
4-261-436-0[]
BT3900U: AEP and UK models
4-261-437-0[]
BT3900U: Russian model
4-261-439-0[]
BT3900U: US and Canadian models
4-261-440-0[]
BT39UW: US model
4-261-441-0[]
BT3950U:  E model
4-261-442-0[]
BT3950U: Saudi Arabia model
4-261-443-0[]
BT3950U: Mexican model
KEY board
front panel
USB connector
AUX jack
Notes on the lithium battery
• Keep the lithium battery out of the reach of children. 
Should the battery be swallowed, immediately consult a doctor.
• Wipe the battery with a dry cloth to assure a good 
contact.
• Be sure to observe the correct polarity when 
installing the battery.
• Do not hold the battery with metallic tweezers, 
otherwise a short-circuit may occur.
Replacing the lithium battery of the card remote 
commander
Under normal conditions, the battery will last approximately 1 year.
(The service life may be shorter, depending on the conditions of use.)
When the battery becomes weak, the range of the card remote commander
becomes shorter. 
Replace the battery with a new CR2025 lithium battery. Use of any other
battery may present a risk of fire or explosion.
1
2
+ side up
c
WARNING
Battery may explode if mistreated.
Do not recharge, disassemble, or dispose of 
in fire.
– Bottom View –
Part No.
Model Number Label
IMPORTANT  NOTE  OF  “INITIALIZING”
The purpose of “Bluetooth Initialize” is to initialize the Bluetooth 
connection history (HF/Audio Streaming). (To delete the device 
information for the devices that you connected to when searching, 
etc.)
When the BT board or MAIN board (including BT board) are re-
placed, it is necessary to initialize this set.
Refer to the following, initialize this set.
Note: Phonebook data and dialed/received call history can be deleted by 
executing “Reset.”
Initializing Bluetooth Settings
Canceling the DEMO mode
You can initialize all the Bluetooth-related 
settings from this unit.
1
Press and hold (SOURCE/OFF) for 1 
second to turn off the power.
2
Press and hold the select button.
The menu list appears.
3
Rotate the control dial to select “BT 
INIT,” then press it.
The confirmation appears.
4
Rotate the control dial to select “INIT-
YES,” then press it.
“INITIAL” flashes while initializing the 
Bluetooth settings.
“COMPLETE” appears when initializing has 
finished.
Note
When disposing of this unit, preset numbers should be 
deleted with “BT INIT.”
You can cancel the demonstration display which 
appears during turning off.
1
Press and hold the select button.
The setup display appears.
2
Rotate the control dial until “DEMO” 
appears, then press it.
3
Rotate the control dial to select 
“DEMO-OFF,” then press it.
The setting is complete.
4
Press 
 (BACK).
The display returns to normal reception/play 
mode.
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