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CQ-C300U
24
Troubleshooting
If You Suspect Something Wrong
Check and take steps as described below.
If the described suggestions do not solve the problem, it is
recommended to take the unit to your nearest authorized
Panasonic Servicenter. The product should be serviced only by
qualified personnel. Please refer the checking and the repair to
professionals. Panasonic shall not be liable for any accidents
arising out of neglect of checking the unit or your own repair
after your checking.
Never take measures especially those other than indicated by
italic letters in “Possible solution” described below because
those are too dangerous for users to handle themselves.
Problem Possible cause Possible solution
No power to the unit
The power cord (battery, power and ground) is connected in the wrong way.
Check the wiring.
Fuse blows out.
Eliminate the cause of fuse blowout and replace the fuse with new one.
Consult your dealer.
Sound is not
generated.
MUTE is set to ON.
Set MUTE to OFF.
The wiring of speaker lines are not correct, or a break or poor contact arises.
Check the wiring in accordance with the wiring diagram. ( Installation
Instructions)
Noise
There is an electromagnetic-wave generator such as a cellular phone near the unit
or its electrical lines.
Keep an electromagnetic-wave generator such as a cellular phone away
from the unit and the wiring of the unit. In case that noise cannot be
eliminated due to the wiring harness of the car, consult your dealer.
The contact of the ground lead is poor.
Make sure that the ground lead is connected to an unpainted part of the
chassis securely.
Noise is made in
step with engine
revolutions.
Alternator noise comes from the car.
Change the wiring position of the ground lead.
Mount a noise filter.
Common
Warning
• Do not use the unit in an irregular condition, for example,
without sound, or with smoke or a foul smell, which can
cause ignition or electric shock. Immediately stop using
the unit and consult your dealer.
• Never try to repair the unit by yourself because it is
dangerous to do so.