Sony MEXBT3900U User Manual

You can cancel the demonstration display which 
appears during turning off.

Press and hold the select button.
The setup display appears.

Rotate the control dial to select 
“DEMO-OFF,” then press it.
The setting is complete.

The display returns to normal reception/play 
mode.

Remove the insulation film.

The clock uses a 12-hour digital indication.

Press and hold the select button.
The setup display appears.

Rotate the control dial until “CLOCK-
ADJ” appears, then press it.
The hour indication flashes.

Rotate the control dial to set the hour 
and minute.
To move the digital indication, press (SEEK) 
–/+.

After setting the minute, press the 
select button.
The setup is complete and the clock starts.

To display the clock, press (DSPL). Press 
(DSPL) again to return to the previous display.

Tip
You can set the clock automatically with the RDS 
feature (page 16).

You can detach the front panel of this unit to 
prevent theft.

If you turn the ignition switch to the OFF 
position without detaching the front panel, the 
caution alarm will sound for a few seconds.
The alarm will only sound if the built-in 
amplifier is used.

Press and hold (SOURCE/OFF).
The unit is turned off.

Notes
• Do not drop or put excessive pressure on the front 

• Do not subject the front panel to heat/high 

• Do not detach the front panel during playback of the 

Engage part A of the front panel with part B of 
the unit, as illustrated, and push the left side into 
position until it clicks.

(SOURCE/OFF)

B

A