Blaupunkt ACR 4251 User Manual

Operating instructions  
ACR 4251  
Table of contents  
Radio operation with RDS ........... 19 Appendix ....................................... 24  
Short instructions ........................ 15  
AF - Alternative frequency .................... 19 Mechanism/cassette tapes ................... 24  
REG - regional programme ................... 19 Specifications ........................................ 24  
Selecting a waveband ........................... 20  
Selecting a station................................. 20  
Automatic tuning ................................ 20  
Important notes ............................ 17  
Precautions ........................................... 17  
Traffic safety ......................................... 17  
QuickOut ............................................... 17  
Installation/Connection.......................... 17  
Manual tuning .................................... 20  
Selecting the seek tuning sensitivity ..... 20  
Switching from stereo to mono (FM) ..... 20  
Anti-theft protection ..................... 18  
Entry of a wrong code number .............. 18 Changing the memory bank .................. 20  
Switching on security coding................. 18 Storing stations ..................................... 21  
Re-start following an interruption of the  
Automatically storing the strongest  
power supply ......................................... 18 stations with Travelstore ....................... 21  
Switching off security coding................. 19 Recalling stored stations ....................... 21  
CODE LED............................................ 19  
Receiving traffic programme  
stations with RDS-EON ................ 22  
Traffic announcement priority on/off ..... 22  
Warning beep........................................ 22  
Switching the warning beep off.......... 22  
Automatic seek tuning start................... 22  
Adjusting the volume for traffic  
announcements and the warning beep . 22  
Tape operation.............................. 23  
Inserting a tape ..................................... 23  
Removing a tape ................................... 23  
Fast winding .......................................... 23  
Changing the tape direction .................. 23  
14  
Short instructions  
3 BAL BALANCE  
Extra function:  
1 On / Off:  
Turn the knob.  
On  
(left/right volume)  
To alter a setting:  
Toggle the BAL button until the corre-  
sponding abbreviation and the adjusted  
value appear in the display.  
To switch between stereo and mono:  
Hold down the button for approximately  
2 seconds. With stereo playback, the  
stereo sign “ ” will appear in the dis-  
play.  
Off  
To adjust the volume:  
Turn the knob.  
5 Cassette removal  
2 AUD audio  
To adjust the  
Press  
.
BASS  
TREBLE (Treble control)  
Use the  
buttons to alter the selec-  
6 Cassette loading slot  
Insert tape (side A or 1 up; the open  
side facing to the right).  
ted setting. The adjusted value is indi-  
cated in the display.  
The last setting will be stored automati-  
cally.  
If the setting remains unchanged within 7 Changing the tape direction /  
8 seconds, the display will switch back  
To alter a setting:  
Toggle the AUD button until the corre-  
sponding abbreviation and the adjusted  
value appear in the display.  
Fast winding  
to the previous condition.  
To switch to the other side of the  
cassette tape:  
4 lo  
Press both the FF + FR buttons simul-  
taneously.  
The display shows TR1-PLAYor  
TR2-PLAY.  
lo (local) - To alter the seek tuning sen-  
sitivity during radio operation.  
If lois displayed, the radio will only  
pick up strong, local stations (normal  
sensitivity).  
If lodoes not light up, the radio will  
also pick up weaker, distant stations  
(high sensitivity).  
If the display shows m, manual tuning  
is adjusted.  
To toggle the function: Press lo  
briefly during radio operation.  
Use the  
buttons to alter the selec-  
ted setting. The adjusted value is indi-  
cated in the display.  
The last setting will be stored automati-  
cally.  
If the setting remains unchanged within  
8 seconds, the display will switch back  
to the previous condition.  
Fast winding  
FR: Fast rewind; stop by pressing FF.  
FF: Fast forward; stop by pressing FR.  
15  
8 1,2,3,4,5 - preset buttons  
You can store five stations on each FM  
memory bank (I, II and T).  
frequency offering better reception of  
the same RDS programme.  
To switch AF on/off: Press AF briefly.  
To shift between the FM memory  
banks:  
Toggle button until the desired bank is  
indicated in the display.  
To store the five most powerful stations  
automatically.  
To store with Travelstore: Press FMT  
until the seek tuning process starts and  
is indicated in the display.  
To recall a station stored with  
Travelstore: Toggle the FMT button  
until the display shows T. Then briefly  
press one of the preset buttons 1 to 5.  
On MW/LW, you can store five stations  
for each waveband.  
To store a station: Press button dur-  
ing radio operation and hold down until  
the radio resumes play and a beep  
sound is heard.  
To recall a station: Select the wave-  
band with the FMT or M·L button, for  
FM select the memory bank with FMT  
and press the corresponding preset  
button briefly.  
Extra functions:  
Hold down the button for approximately  
2 seconds. REG ON/REG OFF is dis-  
played for approximately 2 seconds.  
REG ON / REG OFF - With REG ON  
the system will only switch to a better  
alternative frequency if it offers the  
same regional programme (see REG -  
regional programme).  
= Display  
: TA (Traffic Announcement = priority for  
traffic announcements)  
Extra function:  
Coding: Read chapter Anti-theft pro-  
tectionfirst.  
Buttons 1, 2, 3, 4 - To enter the four-  
digit code.  
Radio operation:  
If TAis displayed, the system will play  
traffic programme stations only.  
TA on/off: Press the TA button.  
Press each of the buttons as many  
times as required until the code num-  
ber given in the car radio passport ap-  
pears in the display.  
NDR1 - Station abbreviation or frequency  
; M·L Travelstore  
FM  
- Waveband  
Changeover button for switching to  
medium and long wave.  
I, II, T - Memory bank (I, II, or Travelstore)  
4
- Preset buttons (1 - 5)  
- Stereo  
< FMT FM, Travelstore  
Changeover button for shifting between  
the FM memory banks I, II and T”  
(Travelstore).  
lo  
AF  
TP  
- Seek tuning sensitivity  
- Alternative RDS frequency  
- You are listening to a traffic  
programme station.  
- Priority for traffic programme  
stations  
9 AF  
(Alternative Frequency during RDS  
operation)  
When AFlights up in the display, the  
radio will automatically search for a  
TA  
16  
Important notes  
Tape operation:  
the car radio from its bracket which enables  
you to carry it out anywhere. The memory of  
the preset buttons is maintained also for long  
periods of time.  
Precautions  
Before starting to use your new car radio,  
please read the information on Traffic safe-  
tyand Anti-theft protectioncarefully.  
If you wish to remove the unit:  
TR I PLAY - Side 1 (or 2)  
CASS << >> - Fast forward/rewind  
Press button aand pull handle b”  
Traffic safety  
firmly.  
If you wish to resume radio or cassette op-  
eration:  
As the driver of a motor vehicle, it is your  
responsibility to pay attention to the traffic  
situationatalltimes.Neveruseyourcarradio  
in a way that could distract you.  
Please keep in mind that you travel a dis-  
tance of 14 m per second at a speed of only  
50 km/h.  
Should the traffic situation become particu-  
larlydemanding,weadviseyounottousethe  
radio.  
Always make sure that you are still able to  
hear any warning signals coming from out-  
side of the vehicle, such as police or fire  
engine sirens, so that you can react accord-  
ingly.  
>
Station tuning automatically, if m”  
has disappeared from  
the display.  
manual, if mlights  
up in the display.  
Toggle by pressing the lo button.  
Push the unit into the bracket as far as  
it will go and lock the handle into place  
on the front plate.  
Operation of the car radio can begin as long  
as the security coding system is switched off.  
If the coding system is active, proceed as  
describedinthechapterSwitchingonsecur-  
ity codingeach time the unit is reinserted.  
? Code LED  
Flashes for additional theft protection  
when the ignition has been switched  
off.  
Installation/Connection  
If you would like to install this equipment  
yourself or add any new components, please  
carefully read the installation and connection  
instructions following the appendix.  
Do not ground the loudspeaker outputs!  
Use only the accessory and replacement  
parts approved by Blaupunkt.  
Therefore, you should always select a moder-  
ate volume for playing your car radio while  
you are driving.  
QuickOut  
This unit is available with or without the  
QuickOut(quick release) option.  
The QuickOut handle facilitates removal of  
17  
Anti-theft protection  
This car radio is supplied with inactive code  
protection. In order to switch the security  
coding system on, proceed as described in  
the following.  
If the coding system is active while the power  
supply to the system is interrupted (e.g. theft,  
disconnection of the car battery), the set will  
be electronically blocked. In such a case it  
canonlybemadeoperableagainbyentering  
the correct code number given in the car  
radio passport.  
unauthorised accessto your car radio.  
When the security code system is activated,  
the unique code must be entered each time  
the power to the unit was interrupted.  
The radio will function again as soon as you  
have entered the correct code.  
If you have lost your radio passport and  
forgotten the code number, your radio can  
only be made operable again by one of our  
authorised service workshops, which is sub-  
ject to payment.  
- Press preset button 3 twice; the dis-  
play shows 2520.  
- Press preset button 4 once; the dis-  
play shows 2521.  
To confirm the code number:  
Press the  
button.  
Now the security coding system is active.  
ThedisplaywillbrieflyshowCeachtimethe  
set is turned on.  
If the display shows CODE ERR, you have  
entered a wrong code. Re-enter the correct  
code after the waiting time (CODEwill ap-  
pear in the display).  
If you switch off the set while it is blocked, the  
waiting time will start anew as soon as the  
radio is turned on again.  
Entry of a wrong code number  
Switching on security coding  
It should not be possible for a thief to find out  
the correct code number by trial and error.  
Thisiswhythesetwillbeblockedforacertain  
periodoftimeafterawrongcodenumberhas  
been entered. The display will then show  
CODE ERR.  
After the first three unsuccessful attempts  
the system will lock for 10 seconds; after  
further attempts, the waiting time extends to  
one hour.  
To activate the coding system:  
Turn off the radio.  
Press preset buttons 1 and 4 simul-  
taneously and hold down.  
Turn on the radio.  
The display shows CODE.  
Re-start following an interrup-  
tion of the power supply  
(coding system is activated)  
Briefly press preset button 1; the dis-  
play shows 0000.  
Turn on the radio.  
The display shows CODE.  
Enter the code number given in the  
Blaupunkt car radio passport.  
After 19 unsuccessful attempts the display  
will show OFF. In this case you can no  
longer re-start the unit.  
Enter the code number given in the  
Blaupunkt car radio passport and con-  
firm (see example under Switching on  
security coding).  
Example: The code number is 2521.  
- Press preset button 1 twice; the dis-  
play shows 2000.  
- Press preset button 2 five times; the  
display shows 2500.  
Note:  
Keep your car radio passport with the code  
number in a safe place in order to avoid  
The unit is now ready for use.  
18  
Radio operation with RDS (Radio Data System)  
The Radio Data System offers you more If SEARCHappears in the display when  
convenience when listening to FM radio sta- switching on the radio or recalling one of the  
Switching off security coding  
Turn off the radio.  
tions.  
stored frequencies, the unit is automatically  
More and more radio stations have begun to searching for an alternative frequency.  
Press preset buttons 1 and 4 simul-  
broadcast RDS information alongside their SEARCHwill disappear from the display  
taneously and hold down while  
programmes.  
when the alternative frequency has been  
switching the set on again.  
The display shows CODE.  
Assoonasaprogrammehasbeenidentified, found or after the frequency band has been  
the station name including a regional identi- run through completely.  
fier, if applicable, will appear in the display, If the reception quality of the selected pro-  
for example, NDR1 NDS (regional program- gramme becomes too poor:  
Now enter the code number to be found  
in the car radio passport and confirm  
(see example under Switching on  
security coding).  
me in Lower Saxony, Germany).  
Tune into another station.  
When RDS is activated, the station buttons  
become programme buttons. You now know  
exactly which programme you have tuned  
into, making it easy to find the desired station  
quickly.  
REG - regional programme  
Security coding is now switched off.  
Certain radio programmes are split up at  
times into regional programmes offering lo-  
cal information. The 1st programme broad-  
cast by NDR, for example, offers program-  
mes with different contents in the northern  
states of Germany Schleswig-Holstein,  
CODE LED  
But RDS offers you further advantages:  
To indicate that your unit is equipped with  
security coding, the LED flashes for extra  
security when the car is stationary.  
AF - Alternative frequency  
The AF (Alternative Frequency) function Hamburg and Lower Saxony at certain times  
makes sure that the strongest frequency of of the day.  
the currently selected programme is always If you are tuned into a regional programme  
tuned in automatically.  
and wish to continue listening to this pro-  
This function is activated when AFappears gramme,  
in the display.  
In order to switch this function on or off,  
press the AF button for approximately  
2 seconds.  
press the AF button briefly.  
REG ONappears in the display.  
The radio will switch to mute briefly while If you leave the service area of the regional  
searching for the strongest reception signal. programme tuned into, or if you would like to  
take advantage of the full RDS service,  
switch to REG OFF.  
19  
Press the AF button for approximately  
2 seconds until you hear the beep and  
REG OFFis indicated in the display.  
Press  
cally search for the next station.  
When keeping the or the button de-  
; the car radio will automati-  
Switching from stereo to mono  
(FM)  
If reception is poor, you may get better sound  
quality by switching to mono:  
When active, REG ONwill be briefly dis- pressed, seek tuning will speed up in up-  
played each time the radio is switched on.  
wards or downwards direction.  
Press the lo button until a beep sound  
is released and the stereo sign  
appears from the display.  
dis-  
Manual tuning  
Selecting a waveband  
Prerequisite: mlights up in the display.  
Toggle the lo button until mis displayed.  
Youcanchoosebetweenthefollowingwave-  
bands:  
FM 87.5 - 108 MHz  
MW 531 - 1602 kHz and  
LW 153 - 279 kHz.  
Each time the radio is switched on, stereo  
playback is activated ( is displayed).  
The unit will automatically switch to mono if  
the received signal is not strong enough for  
stereo playback.  
Press  
; the frequency will change in  
short intervals in upwards or down-  
wards direction.  
When holding the  
frequency scan is speeded up.  
or  
button down, the  
Set the desired waveband by pressing  
FMT or M·L.  
Changing the memory bank  
To switch from MW to LW or vice versa  
Press the M·L button.  
Selecting the seek tuning sensi-  
tivity  
You can shift between the memory banks I, II  
and T in order to store stations and recall  
them later.  
The currently selected memory bank is indi-  
cated in the display.  
You can alter the automatic seek tuning  
sensitivity.  
For this,  
Selecting a station  
Using the  
buttons there are two different  
Toggle the FMT button until the desired  
memory bank lights up in the display.  
ways to tune into a station:  
press the lo button briefly.  
If lois displayed, the radio will only pick up  
strong, local stations (low sensitivity).  
If lodoes not light up, the radio will also pick  
up weaker, distant stations (high sensitivity).  
Make sure that mis not indicated in the  
display.  
Automatic tuning  
Prerequisite: AFand mdo not light up in  
the display, i.e. the Alternative Frequency  
function and manual tuning are switched off.  
Use the AF and lo buttons (lo, m, -, lo) to  
adjust the respective modes.  
20  
Storing stations  
Automatically storing the  
strongest stations with Travel-  
store  
Recalling stored stations  
On FM, you can store five stations on the  
preset buttons 1 to 5 for each of the memory  
banks I, II and T.  
On MW/LW, you can store five stations for  
each waveband.  
You can recall any stored station at the touch  
of a button.  
Select the waveband with FMT or M·L  
button, for FM select the memory bank  
with FMT.  
You can automatically store the five most  
powerful FM stations of your current recep-  
tion area sorted according to their signal  
strength.  
This function is particularly convenient on  
longer trips.  
Select the waveband with FMT or M·L  
button, for FM select the memory bank  
with FMT.  
Toggle the FMT button until the desired  
memory bank is indicated in the display.  
Press the corresponding preset button  
briefly to recall the station.  
Toggle the FMT button until the desired  
memory bank is indicated in the display.  
Press the FMT button until you hear the  
beep. The seek tuning process begins.  
The radio will search for the strongest FM  
stations and store them on the memory bank  
T(Travelstore). When this process has  
been completed, the radio will play the first  
station.  
If desired, stations can also be stored manu-  
ally on the Travelstore bank (see Storing  
stations).  
Tune into a station either automatically  
or manually by pressing  
or  
.
Press the desired preset button until  
the radio resumes play after the muting  
and you hear the beep.  
Now the station has been stored.  
Theactivatedpresetbuttonisindicatedinthe  
display.  
Note:  
If you select an already stored station, the  
corresponding memory bank and preset but-  
ton will flash in the display for about 6  
seconds.  
21  
Receiving traffic programme stations with RDS-EON  
Many FM broadcasters offer traffic mess- To switch the priority on or off:  
Automatic seek tuning start  
ages for their service area at regular inter-  
vals.  
Press the TA button.  
Prerequisite:  
The priority for traffic announcements has  
been activated.  
When pressing TA while a message is being  
broadcast, this message will be interrupted.  
The unit will then switch back to the previous  
condition. The priority for other traffic messa-  
ges remains active.  
All traffic programme stations transmit a spe-  
cial carrier signal alongside their program-  
mes, which is decoded by your car radio. If  
this signal is identified, TPwill appear in the  
display (Traffic Programme).  
When leaving the reception area of the tuned  
in traffic programme station while listening to  
a tape or after having turned down the vol-  
ume completely, the system will automati-  
cally start searching for a new TA programme.  
If no such station is found within approxi-  
mately 30 seconds, tape operation will be  
stopped and a warning beep will sound. To  
switch the warning beep off, proceed as  
described above.  
In addition to these, there are also stations  
which do not actually transmit traffic pro-  
grammes themselves, but by using RDS-  
EON they offer the possibility to receive the  
traffic messages broadcast by another traffic  
programme station in the same radio net-  
work. If you listen to one of these stations  
(e.g. NDR3), TPwill appear in the display  
as soon as the priority for traffic programme  
stationshasbeenactivated, i.e. TAmustbe  
displayed.  
Warning beep  
If you leave the reception area of the traffic  
programme station currently tuned into, you  
will hear a warning beep after approximately  
30 seconds.  
This alarm tone will also be released when  
pressing a preset button which has no traffic  
programme allocated to it.  
Adjusting the volume for traffic  
announcements and the warning  
beep  
Switching the warning beep off  
If a traffic announcement is broadcast, the  
radio will automatically switch to the linked  
traffic programme station (in this case,  
NDR2) for the duration of the message and  
return to the original programme (NDR3)  
afterwards.  
a) Tune into another station offering traffic  
information:  
This volume was preset at the factory.  
Press  
or  
press a preset button which has a  
traffic programme station allocated  
to it.  
Alternatively:  
Traffic announcement priority  
on/off  
b) Switch off the priority for traffic an-  
nouncements:  
If the priority for traffic announcement pro-  
grammes is activated, TAwill light up in the  
display.  
Press TA.  
TAwill disappear from the display.  
22  
Tape operation  
Fast winding  
Changing the tape direction  
Inserting a tape  
(Autoreverse)  
Fast Forward  
Turn on the set.  
Insert a tape.  
Press FF (Fast Forward).  
To switch to the other side of the cassette  
tape during playback:  
At the end of a tape side, the mech-  
anism changes directions automatically  
to play the other side.  
Insert the tape with side A or 1 showing up,  
the open side facing to the right.  
Press both the FR and FF buttons  
simultaneously.  
Stopping Fast Forward operation  
Press FR (Fast Rewind).  
Fast Rewind  
At the end of a tape side, the mechanism  
changes directions automatically to play the  
other side. The display shows TR1-PLAY”  
for track 1 or A, or TR2-PLAYfor track 2 or B.  
= Press to eject the tape.  
Press FR.  
At the beginning of the tape, the mech-  
anism will automatically start playback.  
The tape will be played in the direction used  
last.  
TR1-PLAYin the display means that track  
1 or A is being played.  
Note:  
If the cassette tape does not run properly we  
recommend switching over to the other side.  
Check the cassette for tape slackness by  
rotating the hub. In some cases, rewinding  
the tape will alleviate the problem.  
Stopping Fast Rewind operation  
Press FF.  
Removing a tape  
Press  
.
The cassette will eject.  
Fast winding  
FR: Fast rewind; stop by pressing FF.  
FF: Fast forward; stop by pressing FR.  
23  
Appendix  
Specifications  
Mechanism/cassette tapes  
Amplifier  
Output power:  
To avoid possible problems, you should not  
use cassette tapes longer than 60 or 90  
minutes (C60/C90). Store your tapes in a  
cool place away from dirt, dust and  
temperatures exceeding 50° Celsius. Allow  
very cold tapes to warm up before playing  
theminordertoavoiduneventransport.After  
approximately 100 hours of use, dust  
particles collected on the playback head or  
2 x 7 W RMS power  
acc. to DIN 45 324/3.1  
into 4 Ω  
FM waveband  
Sensitivity:  
1.3 µV at 26 dB  
signal-to-noise ratio  
Frequency  
roller may lead to tape run problems and response:  
sound distortions.  
35 - 15 000 Hz  
40 - 14 000 Hz  
Use a head cleaning tape to remove normal  
dirt build-up. For tougher cases, use a cotton  
swab (Q-Tip) soaked with alcohol. Do not  
attempt to clean by inserting a hard object  
into the player!  
Tape player  
Frequency  
response:  
Subject to modifications!  
24  

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