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40
Troubleshooting
This chapter describes important instructions for trouble-
shooting. Please observe all instructions to avoid risks and
damage.
Safety Precautions
WARNING:
Please observe the following safety instructions to avoid
risks and damage:
Electrical repairs must only be executed by special-
ized staff being trained by the manufacturer. Improper
repairs can cause significant danger for the user and
damage to the unit.
Troubleshooting
Problem Possible cause Solution
Unit cannot be
turned on.
The car ignition
switch is not on.
If the power supply is
properly connected
to the car accessory
terminal, switch the
ignition key to “ACC”.
No sound The volume is set
to minimum.
Increase the volume.
Wiring is improper. Check the wiring.
Disc cannot be
loaded or is
ejected.
Presence of disc
inside the player.
Remove the disc in the
player, and then load a
new one.
Disc inserted in
reverse direction.
Insert the compact
disc with the label
facing up.
The disc is
extremely dirty or
defective.
Clean the disc or try to
play a new one.
CD format is not
supported.
Insert a different CD.
Mistake with home-
burnt CD.
Check your CD in a
different player.
Temperature inside
the car is too high.
Cool off or wait
until the ambient
temperature returns to
normal.
Condensation on
the laser.
Turn the unit off
for several hours
until the moisture is
evaporated.
CD skips. Installation angle
over 30°.
Decrease installation
angle to less than 30°.
CD dirty or
damaged.
Clean the CD or play
different CD.
Problem Possible cause Solution
The operation
keys do not
work.
The built-in
microcomputer
is not operating
properly due to
noise.
Press RESET (29).
The front panel
is not correctly
installed.
Check that the control
panel is attached
securely.
The radio does
not work or no
auto scan.
The antenna cable
is not connected
Insert the antenna
cable firmly
The signals are too
weak.
Select a station
manually.
Station
memory does
not work.
Terminal 4 of
ISO connector
A (continuous
positive) not
properly
connected.
Check the cabling.
Observe chapter
“Connections”.
USB device
does not work.
The USB port is
only for proper
USB devices.
Not all available
devices comply
with the standards.
Possibly a non-
standard device is
connected.
Connect a USB-
conform device.
Ensure the media is
formatted in FAT32
format.
SD/MMC
memory card
does not work.
The unit cannot
read the card.
Check the card. Insert
it with the text side
face up. Ensure the
media is formatted in
FAT32 format.
No connection
can be made
via Bluetooth.
Bluetooth is
switched off on
your mobile phone.
Activate Bluetooth on
your mobile phone.
No audio
signal with
a Bluetooth
connection.
Car radio is not
registered with the
audio source.
Check whether there
is a connection. If
necessary, re-register
the car radio with the
audio source.
Volume is too low. Increase the volume
on the car radio.
Increase the volume
on the audio source.
40


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