Troubleshooting - Panasonic CQ-C7405W Operating Instructions Manual

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
Service Center. 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 for those other than indicated by ital-
ic letters in "Possible Solution" described below because those are
too dangerous for users to handle themselves.
No power to the
Sound is not
generated.
Noise is made in
step with engine
revolutions.
32
CQ-C7405W
Problem
The power cord (battery, power and ground) is connected in the wrong way.
a
Check the wiring.
Fuse blows out.
unit
a
Eliminate the cause of fuse blowout and replace the fuse with new one.
Consult your dealer.
MUTE is set to ON.
a
Set MUTE to OFF.
The wiring of speaker lines are not correct, or a break or poor contact arises.
a
Check the wiring in accordance with the wiring diagram. (Installation
Instructions)
There is an electromagnetic-wave generator such as a cellular phone near the unit or
its electrical lines.
a
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
Noise
due to the wiring harness of the car, consult your dealer.
The contact of the ground lead is poor.
a
Make sure that the ground lead is connected to an unpainted part of the chas-
sis securely.
Alternator noise comes from the car.
a
Change the wiring position of the ground lead.
a
Mount a noise filter on the power supply.
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.
Possible cause a Possible solution