Panasonic CQVD7700U CQVD7500U User Guide - Page 37

E N Troubleshooting G L I S Preliminary Steps H Check and take steps as described in the tables below. 62 If You Suspect Something is Wrong Immediately switch power off. Disconnect the power cable and check that there is neither smoke nor heat from the unit before asking for repairs. Never try to repair the unit yourself because it is dangerous to do so. ■ Common Cautions: ¡Do not use the unit in an irregular condition, for example, without sound, or with smoke or foul smell, which can cause a fire or electric shock. Immediately stop using the unit and call the store where you purchased it. ¡Never try to repair the unit by yourself due to risk of electrical injury and potential damage to electrical safety equipment. Problem No power to the unit Sound is not generated Noise Noise is made in step with engine revolutions. Possible cause a Possible solution The power cord (battery, ACC and ground) is connected in the wrong way. a Check the wiring. Fuse blowout 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 the speaker lines is not correct, or a break or poor contact exists. a Check the wiring in accordance with the wiring diagram. 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 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 securely connected to an unpainted part of the chassis. Alternator noise comes from the car. aChange the wiring position of the ground lead. aMount a noise filter on the power supply. Some operations are not executable. No sound from speaker(s) The speaker channels are reversed between right and left. Some operations are not executable in particular modes such as menu mode. a Read the operating instructions carefully and change the mode. In case the unit is still out of order, consult your dealer. Some sound setting (Example: BAL/FAD, P·MODE, SP SETUP or Dolby Prologic II) is not appropriate. a Readjust the sound setting (BAL/FAD, P·MODE, SP SETUP or Dolby Prologic II, etc.) There is a break, a short circuit, poor contact or wrong wiring regarding the speaker wiring. a Check the speaker wiring. The speaker wiring is confused between right and left. a Perform the speaker wiring in accordance with the wiring diagram. 78 CQ-VD7700U/VD7500U E N G L ■ Common (continued) I S H Problem Possible cause a Possible solution 63 The sound field is not clear in the stereo mode. Central sound is not settled. The plus and minus terminals at right and left channels of speakers are connected reversely. aPerform the speaker wiring in accordance with the wiring diagram. ■ Display Settings Problem The brightness of the screen is not stable. The picture is dark. The picture is whitish. Something is wrong with the picture. The picture is light in color. The display does not go back into the unit. Red, blue, or green spots appears. Possible cause a Possible solution "AUTO" dimmer is selected. aSelect one of the dimmer levels from among 1 to 4 to make the dimmer adjustment become indpendent of light intensity. The screen is not adjusted properly. aMake every adjustment of the screen. The monitor stops on the way to the home position. aPress [ ] (OPEN/CLOSE). This is a characteristic of liquid crystal panels and is not a problem. ■ Remote Control Problem Pressing buttons does not perform operations. Possible cause a Possible solution Battery poles (+) (-) are reversed. aInsert the battery correctly. Wrong battery. aCheck the battery. Battery has run down. aReplace the battery. Remote control is facing in the wrong direction. aDirect the remote control at remote control sensor on the display unit. ■ TV Problem Unclear image due to noise Possible cause a Possible solution The intensity of the radio wave is too low. aChange the broadcast station. Connection or installation of the TV antenna has not been performed correctly. aCheck the connection or installation. 79 CQ-VD7700U/VD7500U