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-PLAY” or
“TR2-PLAY”.
lo (local) - To alter the seek tuning sen-
sitivity during radio operation.
If “lo” is displayed, the radio will only
pick up strong, local stations (normal
sensitivity).
If “lo” does 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-
tection” first.
Buttons 1, 2, 3, 4 - To enter the four-
digit code.
Radio operation:
If “TA” is 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 “AF” lights 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-
ty” and “Anti-theft protection” carefully.
If you wish to remove the unit:
TR I PLAY - Side 1 (or 2)
CASS << >> - Fast forward/rewind
•
Press button “a” and 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 “m” lights
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
describedinthechapter“Switchingonsecur-
ity coding” each 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 access” to 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.
Thedisplaywillbrieflyshow“C”eachtimethe
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 (“CODE” will 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 “SEARCH” appears 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 “SEARCH” will 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 “AF” appears 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 ON” appears 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 OFF” is 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 ON” will 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: “m” lights up in the display.
Toggle the lo button until “m” is 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 “lo” is displayed, the radio will only pick up
strong, local stations (low sensitivity).
If “lo” does not light up, the radio will also pick
up weaker, distant stations (high sensitivity).
Make sure that “m” is not indicated in the
display.
Automatic tuning
Prerequisite: “AF” and “m” do 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, “TP” will 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), “TP” will appear in the display
as soon as the priority for traffic programme
stationshasbeenactivated, i.e. “TA”mustbe
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, “TA” will light up in the
display.
•
Press TA.
“TA” will 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-PLAY” for 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-PLAY” in 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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