Sony Car Stereo System CDX 4250 User Manual

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  
 
 
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