BMW 730i Owner's Handbook Manual page 180

General malfunctions
The BMW CD changer is optimised for the
operation inside the vehicle. It may react with
more sensitivity to defective CDs than devices
for stationary application.
If a CD cannot be played, first check whether it
is correctly inserted into the drive.
Atmospheric humidity
Due to high atmospheric humidity the CD or the
focusing lens for laser beam can be misty and
as a result it may be impossible to play it for a
while.
Malfunctions with individual CDs
If malfunctions occur only with individual CDs,
this can have one of the following causes.
Self-recorded CDs
Causes of malfunctions with self-recorded CDs
are, e.g. non-uniform data-creation and copying
methods as well as low quality or rapid ageing of
the blank disc being used.
Only write on the upper side of CDs using a spe-
cial marker pen.
Damaged CDs
Avoid causing fingerprints and protect against
dust, scratches and moisture.
Store CDs in a case.
Do not expose CDs to temperatures in excess
of 506/1227, high atmospheric humidity and
direct sunlight.
CDs with copy protection
CDs are often copy-protected by the manufac-
turer. This could result in CDs being impossible
to play, or only playable with restrictions.
Care notes
For useful information on this subject, see the
booklet Looking after your car.
178
Online Edition for Part no. 01 41 0 013 197 - © 02/07 BMW AG