36TroubleshootingCQ-5800UIf You Suspect Something WrongCheck and take steps as described below.If the described suggestions do not solve the problem, it isrecommended to take the unit to your nearest authorized PanasonicServicenter. The product should be serviced only by qualified personnel.Please refer the checking and the repair to professionals. Panasonicshall not be liable for any accidents arising out of neglect of checking theunit 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 aretoo dangerous for users to handle themselves.Warning¡ Do not use the unit in an irregular condition, forexample, without sound, or with smoke or a foulsmell, which can cause ignition or electric shock.Immediately stop using the unit and consult yourdealer.¡ Never try to repair the unit by yourself because it isdangerous to do so.Problem Possible cause a Possible solutionNo power to the unitThe power cord (battery, power and ground) is connected in the wrong way.a Check the wiring.Fuse blows out.a 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.a Set MUTE to OFF.There is contact between the external mute lead and the chassis.a Connect the external mute lead correctly. If the lead is unused, insulate it.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.NoiseThere is an electromagnetic-wave generator such as a cellular phone near the unit orits electrical lines.a Keep an electromagnetic-wave generator such as a cellular phone away fromthe unit and the wiring of the unit. In case that noise cannot be eliminateddue 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.Noise is made in step withengine revolutions.Alternator noise comes from the car.a Change the wiring position of the ground lead.a Mount a noise filter on the power supply.CommonSome operations are notexecutable.Some operations are not executable in particular modes such as menu mode.a Read the operating instructions carefully and cancel the mode. If the unit isstill out of order, consult your dealer.