3-865-649-11 (1)
FM/AM
Compact Disc
Player
US
Operating Instructions
Owner’s Record
The model and serial numbers are located on the bottom of the unit.
Record the serial number in the space provided below.
Refer to these numbers whenever you call upon your Sony dealer regarding this
product.
Model No. CDX-4250 Serial No.
For installation and connections, see the supplied installation/connections
manual.
CDX-4250
1999 by Sony Corporation
Table of Contents
Location of controls ................................................. 4
Additional Information
Precautions ......................................................... 10
Maintenance....................................................... 11
Dismounting the unit ....................................... 11
Specifications ..................................................... 12
Troubleshooting guide ..................................... 13
Getting Started
Resetting the unit ................................................ 5
Detaching the front panel .................................. 5
Setting the clock .................................................. 6
CD Player
Listening to a CD ................................................ 6
Playing a CD in various modes ........................ 7
Radio
Memorizing stations automatically
— Best Tuning Memory (BTM) ................... 7
Memorizing only the desired stations ............. 8
Receiving the memorized stations.................... 8
Other Functions
Adjusting the sound characteristics ................. 9
Turning on the clock display
— Power Select Function .............................. 9
Changing the sound and beep sound .............. 9
3
Location of controls
MODE
BTM
SOUND
SEEK/AMS
SENS
DSPL
1
OFF
2
3
D - BASS
SOURCE
REPEAT
SHUF
1
2
3
4
5
6
OFF
RELEASE
CDX-4250
Refer to the pages for details.
0 RELEASE (front panel release) button 5,
1 SEEK/AMS (seek/Automatic Music
11
Sensor/manual search) control 7, 8
!¡ Reset button (located on the front side
2 MODE (band select) button 7, 8
of the unit behind the front panel) 5
3 SOURCE (source select) button 6, 7, 8
!™ OFF button 5, 6, 9
4 Dial (volume/bass/treble/left-right/
!£ During radio reception:
front-rear control) 6, 9
Number buttons 8
5 SOUND button 6, 9
During CD playback:
(1) REPEAT button 7
(2) SHUF button 7
6 Display window
7 SENS/BTM (sensitivity adjust/Best
Tuning Memory) button 7, 8
!¢ D-BASS control 9
8 6 (eject) button 6
9 DSPL (display mode change/time set)
button 6, 8
4
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.
Getting Started
Resetting the unit
Attaching the front panel
Before operating the unit for the first time or
after replacing the car battery, you must reset
the unit.
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 into position.
Remove the front panel and press the reset
button with a pointed object, such as a ball-
point pen.
a
b
Reset button
Notes
• Pressing the reset button will erase the clock
setting and some memorized program and
memory 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.
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.
Detaching the front panel
You can detach the front panel of this unit to
protect the unit from being stolen.
Caution alarm
If you turn the ignition key switch to the OFF
position 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.
1 Press (OFF).
2 Press (RELEASE), then slide the front
panel a little to the left, and pull it off
towards you.
(OFF)
(RELEASE)
5
Setting the clock
The clock has a 12-hour digital indication.
CD Player
Example: To set the clock to 10:08
1 Press (DSPL) during operation.
If the POWER SELECT function is set to
“ON,” go to step 2. If it is set to “OFF,” set
Listening to a CD
Insert a CD.
Playback starts automatically.
to “ON” (page 9).
Label side up
2 Press (DSPL) for two seconds.
The hour indication flashes.
1 Set the hour.
To go backward
SOURCE
If a CD is already inserted, press (SOURCE)
repeatedly until “CD” appears to start
playback.
To go forward
Elapsed playing time
2 Press (SOUND).
Note
To play back an 8 cm (3 in.) CD, use the optional
Sony compact disc single adapter (CSA-8).
The minute indication flashes.
To
Press
3 Set the minute.
Stop playback
Eject the CD
6 or (OFF)
6
To go backward
SOURCE
Changing the display item
To go forward
Each time you press (DSPL) during CD
playback, the item changes as follows:
zElapsed playing time zTrack number
MOTION DISPLAY* Z
Clock Z
3 Press (DSPL).
* All the above items are scrolled in the display
one by one in order.
The clock starts.
Note
If the car has no accessory position on the ignition
key switch, the clock cannot be set unless the
power is turned on. Set the clock after you have
turned on the radio, or started CD playback.
6
Locating a specific track
— Automatic Music Sensor (AMS)
Radio
During playback, push the SEEK/AMS
control up or down and release for each
track you want to skip.
SEEK/AMS
To locate succeeding
tracks
Memorizing stations
To locate preceding
tracks
automatically
— Best Tuning Memory (BTM)
Locating a specific point in a track
— Manual Search
This unit selects the stations with the strongest
signals and memorizes them in the order of
their frequencies. You can store up to 6 stations
on each band (FM I, FM II, FM III, and AM).
During playback, push the SEEK/AMS
control up or down and hold for about
two seconds. Release when you have
found the desired point.
Caution
SEEK/AMS
When tuning in stations while driving, use
Best Tuning Memory to prevent accidents.
To search forward
To search backward
1 Press (SOURCE) repeatedly to select the
tuner.
Note
If “
Each time you press (SOURCE), the mode
changes as follows:
CD ˜ TUNER
” or “
” appears in the
display, you have reached the beginning or the
end of the disc and you cannot go any further.
2 Press (MODE) repeatedly to select the
band.
Each time you press (MODE), the band
changes as follows:
Playing a CD in various
modes
”FM I ”FM II ”FM III ”AM
Playing tracks repeatedly
— Repeat Play
3 Press (SENS/BTM) for two seconds.
The unit stores stations in the order of their
frequencies on the number buttons.
Press (1) during playback.
“REP” appears in the display.
A beep sounds when the setting is stoned.
Notes
When the current track is over, it will play
again from the beginning.
• The unit does not store stations with weak
signals. If only a few stations can be received,
some number buttons will retain their former
setting.
• When a number is indicated in the display, the
unit starts storing stations from the one currently
displayed.
To return to normal playback mode, press
again.
Playing tracks in random order
— Shuffle Play
• If a CD is not in the unit, only the tuner band
appears even if you press (SOURCE).
Press (2) during playback.
“SHUF” appears in the display.
To return to normal playback mode, press
again.
7
If you cannot tune in a preset
station
Memorizing only the
desired stations
You can store up to 6 stations on each band (a
total of 18 for FM I, FM II, and FM III, and 6 for
AM) in the order of your choice.
Push and release the SEEK/AMS control
up or down to search for the station
(automatic tuning).
Scanning stops when the unit receives a
station. Push the SEEK/AMS control up or
down repeatedly until the desired station is
received.
1 Press (SOURCE) repeatedly to select the
tuner.
Note
If the automatic tuning stops too frequently, press
(SENS/BTM) repeatedly until “LCL” (local seek
mode) is displayed. Only the stations with
relatively strong signals will be tuned in.
2 Press (MODE) repeatedly to select the
band.
3 Push the SEEK/AMS control up or down
to tune in the station that you want to
store on the number button.
Tip
If you know the frequency of the station you want
to listen to push the SEEK/AMS control up or down
and hold until the desired frequency appears
(manual tuning).
4 Press and hold the desired number
button ((1) to (6)) until “MEM” appears.
The number button indication appears in
the display.
If FM stereo reception is poor
— Monaural Mode
Press (SENS/BTM) repeatedly until
“MONO” appears.
The sound improves, but becomes
monaural (“ST” disappears).
Note
If you try to store another station on the same
number button, the previously stored station will
be erased.
To return to normal mode, press again until
“MONO” disappears.
Receiving the memorized
stations
Changing the display item
Each time you press (DSPL), the item changes
as follows:
zFrequency
zClock
1 Press (SOURCE) repeatedly to select the
tuner.
MOTION DISPLAY* Z
* All the above items are scrolled in the display
one by one in order.
2 Press (MODE) repeatedly to select the
band.
3 Press the number button ((1) to (6)) on
which the desired station is stored.
8
Changing the sound and
beep sound
Other Functions
Boosting the bass sound — D-bass
You can enjoy a clear and powerful bass
sound.
Adjusting the sound
characteristics
You can adjust the bass, treble, balance, and
fader. You can store the bass and treble levels.
The D-bass function boosts the low frequency
signal with a sharper curve than conventional
bass boost.
You can hear the bass line more clearly even
while the vocal remains at the same volume.
You can emphasize and adjust the bass sound
easily with the D-BASS control. This is similar
in effect to an optional subwoofer system.
1 Select the item you want to adjust by
pressing (SOUND) repeatedly.
D-BASS 3
D-BASS 2
D-BASS 1
BAS (bass) n TRE (treble) n
BAL (left-right) n FAD (front-rear) n
VOL (volume)
2 Adjust the selected item by rotating the
dial.
0dB
Frequency (Hz)
Adjust within three seconds after selecting
the item. (After three seconds, the dial
function reverts to volume control.)
Adjusting the bass curve
Turn the D-BASS control to adjust the
bass level (1, 2, or 3).
“D-BASS” appears in the display.
To cancel, turn the control to OFF.
Turning on the clock
display — Power Select Function
Only for cars with an accessory position on the
ignition key switch
Note
If the bass sound becomes distorted, adjust the
D-BASS control or volume.
Cancel the beep sound
To turn the Power Select Function ON
Press (6) while pressing (SOUND).
Press (OFF) while pressing (SOUND).
The Power Select Function ties the clock
display power to the accessory position on
the ignition key switch.
To avoid battery wear, the clock is not
displayed while the unit is initializing.
To obtain the beep sound again, press these
buttons again.
Note
If you connect an optional power amplifier and do
not use the built-in amplifier, the beep sound will
be deactivated.
9
Before playing, clean the discs with an optional
cleaning cloth. Wipe each disc from the center
out.
Do not use solvents such as benzine, thinner,
commercially available cleaners, or antistatic
spray intended for analog discs.
Additional
Information
Precautions
• If your car was parked in direct sunlight
resulting in a considerable rise in
temperature inside the car, allow the unit to
cool off before operating it.
• If no power is being supplied to the unit,
check the connections first. If everything is in
order, check the fuse.
• If no sound comes from the speakers of a
two-speaker system, set the fader control to
the center position.
•If your car is equipped with a power
antenna, it will extend automatically while
the unit is operating.
Notes on moisture condensation
On a rainy day or in a very damp area,
moisture may condense on the lenses inside
the CD player. Should this occur, the unit will
not operate properly. In this case, remove the
disc and wait for about an hour until the
moisture evaporates.
When you play 8 cm (3 in.) CDs
If you have any questions or problems
concerning your unit that are not covered in
this manual, please consult your nearest Sony
dealer.
Use the optional Sony compact disc single
adapter (CSA-8) to protect the CD player from
damage.
Notes on handling CDs
A dirty or defective disc may cause sound
dropouts while playing. To enjoy optimum
sound, handle the disc by its edge. To keep the
disc clean, do not touch the surface.
Do not stick paper or tape on the labeled
surface.
Do not expose the discs to direct sunlight or
heat sources such as hot air-ducts, or leave
them in a car parked in direct sunlight where
there can be a considerable rise in temperature
inside the car.
10
Maintenance
Dismounting the unit
Fuse replacement
When replacing the fuse, be sure to use one
matching the amperage rating stated on the
original fuse. If the fuse blows, check the
power connection and replace the fuse. If the
fuse blows again after replacement, there may
be an internal malfunction. In such a case,
consult your nearest Sony dealer.
Release key
(supplied)
µ
µ
Fuse (10 A)
Warning
Never use a fuse with an amperage rating
exceeding the one supplied with the unit as
this could damage the unit.
µ
Pull the unit out while the release key is inserted.
Cleaning the connectors
The unit may not function properly if the
connectors between the unit and the front
panel are not clean. In order to prevent this,
open the front panel by pressing (RELEASE),
then detach it and clean the connectors with a
cotton swab dipped in alcohol. Do not apply
too much force. Otherwise, the connectors may
be damaged.
µ
Press the clip inside the front cover with a thin
screwdriver, and gently pry the front cover free.
Main unit
Back of the front panel
Notes
• For safety, turn off the engine before cleaning
the connectors and remove the key from the
ignition key switch.
• Never touch the connectors directly with your
fingers or any metal device.
11
Specifications
AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL HARMONIC DISTORTION
17 watts per channel minimum continuous average power into
4 ohms, 4 channels driven from 20 Hz to 20 kHz with no more than
1 % total harmonic distortion.
Other specifications
CD player section
General
Outputs
System
Compact disc digital audio
system
Power antenna relay
control
Telephone ATT control
lead
Bass ±8 dB at 100 Hz
Treble ±8 dB at 10 kHz
12 V DC car battery
(negative ground)
Approx.178×50×185mm
(7 1/8 × 2 × 7 3/8 in.)
(w/h/d)
Approx. 182 × 53 × 162 mm
(7 1/4 × 2 1/8 × 6 1/2 in.)
(w/h/d)
Approx. 1.2 kg (2 lb. 10 oz.)
Parts for installation and
connections (1 set)
Front panel case (1)
Cleaning cloth XP-CD1
Compact disc single
adapter CSA-8
Signal-to-noise ratio
Frequency response
Wow and flutter
Laser Diode Properties
Material
90 dB
10 – 20,000 Hz
Below measurable limit
Tone controls
GaAlAs
780 nm
Power requirements
Dimensions
Wavelength
Emission Duration
Laser output power
Continuous
Less than 44.6 µW*
* This output is the value measured at a distance
of 200 mm from the objective lens surface on
the Optical Pick-up Block.
Mounting dimensions
Mass
Supplied accessories
Tuner section
FM
Tuning range
87.5 – 107.9 MHz
Optional accessories
Antenna terminal
Intermediate frequency 10.7 MHz
Usable sensitivity
Selectivity
Signal-to-noise ratio
External antenna connector
9 dBf
75 dB at 400 kHz
65 dB (stereo),
68 dB (mono)
Design and specifications are subject to change
without notice.
Harmonic distortion at 1 kHz
1.0 % (stereo),
0.7 % (mono)
35 dB at 1 kHz
30 – 15,000 Hz
Separation
Frequency response
AM
Tuning range
Antenna terminal
530 – 1,710 kHz
External antenna connector
Intermediate frequency 10.71 MHz/450 kHz
Sensitivity 30 µV
Power amplifier section
Outputs
Speaker outputs
(sure seal connectors)
4 – 8 ohms
Speaker impedance
Maximum power output 40 W × 4 (at 4 ohms)
12
Troubleshooting guide
The following checklist will help you remedy the problems you may encounter with your unit.
Before going through the checklist below, check the connection and operating procedures.
General
Cause/Solution
Problem
•Rotate the dial in a clockwise direction to adjust the volume.
•Set the fader control to the center position for two-speaker
systems.
No sound.
• The power cord or battery has been disconnected.
• The reset button has been pressed.
n Store the settings again into the memory.
The contents of the memory
have been erased.
Indications do not appear in
the display.
Remove the front panel and clean the connectors. See “Cleaning
the connectors” (page 11) for details.
No beep sound.
• An optional power amplifier is connected and you are not
using the built-in amplifier.
• The beep sound is cancelled (page 9).
CD playback
Problem
Cause/Solution
CD cannot be loaded.
• Another CD is already loaded.
• The CD was forcibly inserted upside down.
Play does not begin.
CD is automatically ejected.
CD will not eject.
Dirty disc.
The ambient temperature exceeds 50°C (122°F).
Press the 6 button for two seconds.
Press the reset button.
The operation buttons do not
function.
The sound skips due to
vibration.
• The unit is installed at an angle of more than 60°.
• The unit is not installed in a sturdy part of the car.
Radio reception
Problem
Cause/Solution
Preset tuning is not possible.
• Memorise the correct frequency.
• The broadcast signal is too weak.
Automatic tuning is not
possible.
The broadcast signal is too weak.
n Use manual tuning.
The “ST” indication flashes.
•Tune in the frequency accurately.
•The broadcast signal is too weak.
n Set to the MONO mode (page 8).
13
Error displays
The following indications will flash for about five seconds.
Solution
Display
Cause
Clean or insert the CD correctly.
A CD is dirty or inserted upside
down.
Press the reset button or 6.
The CD player cannot be operated
because of some problem.
If the above-mentioned solutions do not help improve the situation, consult your nearest Sony
dealer.
14
Sony Corporation Printed in Korea
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