2008 MERCEDES-BENZ SLK280 Control functions

198 Controls in detail
Audio system
Returning sound functions to factory
settings
Press O button to call up settings
menu in the display.
Press RES soft key briefly; the respec-
tive sound function is reset to its center
level.
or
Press and hold RES soft key until RESET
appears in the display.
The sound settings for bass and treble
are returned to their center level and
the volume is set to a predefined level.
The radio switches back to the
standard radio menu 4 seconds after
the last soft key is pressed.Adjusting balance
Press P button.
BALANCE appears in the display.
Press X or Y soft key.
The volume is distributed between the
left and right sides of the vehicle.
or
Press RES soft key briefly.
The balance is reset to its center level.
The radio switches back to the
standard radio menu 8 seconds after
the last button is pressed.Returning volume distribution to
factory settings
Press P button to call up settings
menu in the display.
Press RES soft key briefly; the
respective volume distribution is reset
to its center (flat) level.
or
Press and hold RES soft key until RESET
appears in the display.
The volume distribution settings for the
balance is set to the center level.
The radio switches back to the
standard radio menu 4 seconds after
the last soft key is pressed.

209 Controls in detail
Audio system
General notes
The system may not be able to play audio
CDs with copy protection.
Playing copied CDs may cause
malfunctions during playback.Should excessively high or low tempera-
tures occur while in CD changer mode*,
CD TEMP will appear in the display, and the
CD will be muted until the temperature has
reached an acceptable level for the system
to continue operation.
The single CD player and the CD changer*
play audio CDs.
Warning!G
In order to avoid distraction which could
lead to an accident, the driver should insert
CDs with the vehicle at a standstill and
operate the audio system only if permitted
by road, weather and traffic conditions.
Bear in mind that at a speed of just
30 mph (approximately 50 km/h), your
vehicle is covering a distance of
44 feet (approximately 14 m) every second.
iThe audio system plays both CD-Rs and
CD-RWs with audio data.
!If you affix stickers to the CDs, they can be-
come warped due to the heat that develops in
the CD drive or CD changer.
In certain situations, the CDs can then no longer
be ejected and cause damage to the drive. Such
damage is not covered by the Mercedes-Benz
Limited Warranty.
!Your CD drive or CD changer has been
designed to play CDs which correspond to the
EN 60908 standard. You can therefore only use
CDs with a maximum thickness of 1.3 mm.
If you insert thicker data carriers, e.g. ones that
have data on both sides (one side with DVD data,
the other side with audio data), they cannot be
ejected and will damage the drive.
!Do not use CDs with an 8 cm diameter, not
even with a CD adapter. Attempting to play CDs
with an 8 cm diameter or playing such CDs with
an adapter may cause damage to the CD drive.
Such damage is not covered by the
Mercedes-Benz Limited Warranty.

211 Controls in detail
Audio system
Compatible bit and sampling rates
Fixed and variable bit rates of up to
320 kBit/s are possible.
The following table lists possible sampling
rates:Information on copyright
The music tracks that you create for use in
MP3 mode or that you play in MP3 mode
are subject to copyright laws under appli-
cable international and national regula-
tions.
In many countries, the reproduction of
copyrighted materials is not permitted,
even if only for personal use, without the
express prior consent of the copyright
holder.
Please check the current copyright laws
for your country and comply with them.
These restrictions do not apply, for exam-
ple, to your own compositions and record-
ings, or for recordings for which
authorization has been obtained from the
copyright holder.MP3 playback
You can play an MP3 CD on the
CD changer* as you would any standard
audio CD. All of the functions described for
the CD changer also apply for the playback
of MP3 CDs. Keep in mind that the single
CD player in the audio system unit is not
able to read MP3 CDs.
The first 99 tracks on the CD, including
tracks in subdirectories, are recognized
and played. Any additional tracks will not
be played.
MPEG1
Audio Layer344.1 KHz, 48 KHz,
32 KHZ
MPEG2
Audio Layer322.5 KHz, 24 KHz,
16 KHz
MPEG2.5
Audio Layer311.025 KHz,
12 KHz, 8 KHz
WMA32 KHz, 44.1 KHz,
48 KHz
iOnly use MP3 tracks with a bit rate of
128 kBit/s or higher and with the specified
sampling rates.
The use of rates other than those specified may
lead to noticeably inferior sound quality.
iDue to the branched data structure, play-
back of the first track may be delayed slightly.

219 Controls in detail
Audio system
Track and time display
Press T soft key.
The number of the track being played
and the elapsed playing time appear in
the display.
Press T soft key again.
The total number of tracks and the total
playing time of the CD appear in the
display.
Press T soft key.
The standard CD playback menu
appears in the display.
GSM network phones
Using your Mercedes-Benz specified
mobile telephone*, a number of functions
and operating steps can be performed and
displayed in the audio system display.
Warning!G
A driver’s attention to the road must always
be his/her primary focus when driving.
For your safety and the safety of others, we
recommend that you pull over to a safe
location and stop before placing or taking a
telephone call. If you choose to use the
telephone
1 while driving, please use the
hands-free device and only use the tele-
phone when weather, road, and traffic
conditions permit.
Some jurisdictions prohibit the driver from
using a cellular telephone while driving a
vehicle.
Bear in mind that at a speed of just
30 mph (approximately 50 km/h), your
vehicle is covering a distance of
44 feet (approximately 14 m) every second.
1Observe all legal requirements.

221 Controls in detail
Audio system
Adjusting the volume
Turn rotary control of E button
during a telephone call.
The volume will increase or decrease
depending on the direction turned.
Adjusting sound
Adjust sound during a telephone call.
Sound adjustment see “Adjusting
sound functions” (
page 197).Placing a call
Entering a telephone number and
starting the dialing process
Enter desired telephone number using
buttons 1 to R.
The number can have up to 32 digits,
but only twelve of these are visible in
the display.
If necessary, correct number entered
with the
CLR soft key. Press soft key
briefly to delete the last digit entered;
press soft key and hold to delete the
complete number.
After correct telephone number has
been entered, press s button.
Phone book
The numbers stored in the phone book of
the telephone can be called up either by
name or number.
In addition, incoming calls are stored in the
phone book.
iThe volume can be adjusted separately for
telephone mode and audio mode.
iIf the telephone number has been saved
together with a name in the telephone book, the
name will appear in the display.
iThis is only possible, however, when the call
information transmitted includes the number of
the person calling. If the telephone number is not
transmitted,
NO NUMBER will be stored in the
phone book.

226 Controls in detail
Audio system

Combining two calls
Press 3 and s buttons.
The calls are combined into one
call.

Terminating a combined call
Press t button.
The connection to both callers is
terminated.
TDMA or CDMA network phonesUsing your Mercedes-Benz specified
mobile telephone*, a number of functions
and operating steps can be performed and
displayed in the audio system display.
Further operating instructions not covered
here can be found in the operating instruc-
tions for the multifunction steering wheel
and the mobile telephone*.
If your audio system is set up for telephone
operation, the t symbol will appear in
the display.
When you insert your Mercedes-Benz
specified mobile telephone* into the
telephone cradle, you will be prompted to
enter your PIN for 30 seconds
(
page 227). This display disappears
when you press any button.
When your mobile telephone* is inserted
into the telephone cradle, you will see the
reception strength in the upper right-hand
corner of the display.
Warning!G
A driver’s attention to the road must always
be his/her primary focus when driving. For
your safety and the safety of others, we rec-
ommend that you pull over to a safe location
and stop before placing or taking a tele-
phone call. If you choose to use the tele-
phone
1 while driving, please use the
hands-free device and only use the tele-
phone when weather, road, and traffic con-
ditions permit.
Some jurisdictions prohibit the driver from
using a cellular telephone while driving a ve-
hicle.
Bear in mind that at a speed of just
30 mph (approximately 50 km/h), your
vehicle is covering a distance of
44 feet (approximately 14 m) every second.
1Observe all legal requirements.

227 Controls in detail
Audio system
Switching on the telephone
Switching on the telephone
Press h button.
If you have programmed an unlock
code for the telephone, you must now
enter the code.
Enter code using buttons 1
toR.
If necessary, correct number entered
with the
CLR soft key. Press soft key
briefly to delete the last digit entered;
press soft key and hold to delete the
complete number.
Press OK soft key after entering correct
code.
The telephone is unlocked. If you have
entered an incorrect code, you must
enter the correct code.
Switching off the telephone
Press h button for approximately
3 seconds.
PROCESSING appears in the display until
the telephone is off. Afterward,
PHONE OFF appears in the display.
Adjusting the volume
Turn rotary control ofEbutton during
a telephone call.
The volume will increase or decrease
depending on the direction turned.Adjusting sound
Adjust sound during a telephone call.
Sound adjustment see “Adjusting
sound functions” (
page 197).
Placing a call
Entering a telephone number and
starting the dialing process
Enter desired telephone number using
buttons 1 to R.
The number can have up to 32 digits,
but only twelve of these are visible in
the display.
iThe volume can be adjusted separately for
telephone mode and audio mode.


233 Controls in detail
Audio system
Emergency calls “911”
The following describes how to dial a “911”
emergency call using the audio system
head unit when a Mercedes-Benz specified
mobile phone* is inserted in the phone
cradle. Unless otherwise specified, the
descriptions refer to the audio system
head unit.
Consult the separate telephone operating
instructions that came with your mobile
phone* for information on how to place a
“911” emergency call on the mobile
phone*. The following conditions must be met for a
“911” emergency call:

Telephone must be switched on.

The corresponding mobile communica-
tions network must be available.
If you cannot make an emergency call, you
will have to initiate rescue measures
yourself. GSM network phones
Placing a “911” emergency call using
audio head unit with the phone lockedPress hbutton to switch to
telephone operation.
PIN? appears in the audio display.
Enter 911 using the number keypad on
the audio head unit.
Press OK soft key or sbutton for
dialing to begin.
DIALING appears in the audio display
while the telephone establishes the
connection.
Wait until the emergency call center
answers, then describe the emergency. Warning!G
The “911” emergency call system is a public
service. Using it without due cause is a
criminal offense.
iEmergency calls may not be possible with
all telephone networks or if certain network
services and/or telephone functions are active.
Check with your local service providers.