Sony CDX-3900, Operating Instructions Manual

6

Notes
• Be sure not to drop the panel when detaching it

from the unit.

• If you detach the panel while the unit is still

turned on, the power will turn off automatically
to prevent the speakers from being damaged.

• When carrying the front panel with you, use the

supplied front panel case.

Attaching the front panel

Attach part 

A

 of the front panel to part 

B

 of

the unit as illustrated and push the left side
into position until it clicks.

Notes
• Be sure not to attach the front panel upside

down.

• Do not press the front panel too hard against the

unit when attaching it.

• Do not press too hard or put excessive pressure

on the display window of the front panel.

• Do not expose the front panel to direct sunlight

or heat sources such as hot air ducts, and do not
leave it in a humid place. Never leave it on the
dashboard of a car parked in direct sunlight or
where there may be a considerable rise in
temperature.

Caution alarm

If you turn the car ignition off without
removing the front panel, the caution alarm
will beep for a few seconds.
If you connect an optional power amplifier and
do not use the built-in amplifier, the beep
sound will be deactivated.

A

B

Reset button

(OFF)

Getting Started

Resetting the unit

Before operating the unit for the first time or
after replacing the car battery, you must reset
the unit.
Remove the front panel and press the reset
button with a pointed object, such as a
ballpoint pen.

Notes
• Pressing the reset button will erase the clock

setting and some memorised functions.

• When you connect the power supply cord to the

unit or reset the unit, wait for about 10 seconds
before you insert a disc. If you insert a disc within
these 10 seconds, the unit will not be reset, and
you will have to press the reset button again.

Detaching the front panel

You can detach the front panel of this unit to
prevent the unit from being stolen.

1

Press 

(OFF)

.

2

Press 

(RELEASE)

, then slide the front

panel a little to the left, and pull it off
towards you.

(RELEASE)