Troubleshooting - Panasonic CQ-VD7500U Operating Instructions Manual

Troubleshooting

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Preliminary Steps
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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
Problem
The power cord (battery, ACC and ground) is connected in the wrong way.
a Check the wiring.
No power to the unit
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.
Sound is not
generated
The wiring of the speaker lines is not correct, or a break or poor contact exists.
Check the wiring in accordance with the wiring diagram.
a
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
a
from the unit and the wiring of the unit. In case that noise cannot be elim-
Noise
inated 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.
Noise is made in step Alternator noise comes from the car.
aChange the wiring position of the ground lead.
with engine revolu-
tions. aMount a noise filter on the power supply.
Some operations are not executable in particular modes such as menu mode.
Some operations are
a Read the operating instructions carefully and change the mode. In case
not executable.
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.
Readjust the sound setting (BAL/FAD, P·MODE, SP SETUP or Dolby
a
No sound from speak-
Prologic II, etc.)
er(s)
There is a break, a short circuit, poor contact or wrong wiring regarding the
speaker wiring.
a
The speaker channels The speaker wiring is confused between right and left.
are reversed between
a
right and left.
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CQ-VD7700U/VD7500U
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.
Possible cause Possible solution
a
Check the speaker wiring.
Perform the speaker wiring in accordance with the wiring diagram.
Common (continued)
Problem
The sound field is not The plus and minus terminals at right and left channels of speakers are con-
nected reversely.
clear in the stereo
mode. Central sound is aPerform the speaker wiring in accordance with the wiring diagram.
not settled.
Display Settings
Problem
"AUTO" dimmer is selected.
The brightness of the
Select one of the dimmer levels from among 1 to 4 to make the dimmer
a
screen is not stable.
adjustment become indpendent of light intensity.
The picture is dark. The pic-
The screen is not adjusted properly.
ture is whitish. Something is
Make every adjustment of the screen.
a
wrong with the picture.
The picture is light in color.
The display does not
The monitor stops on the way to the home position.
go back into the unit.
a Press [
Red, blue, or green
This is a characteristic of liquid crystal panels and is not a problem.
spots appears.
Remote Control
Problem
Battery poles (+) (–) are reversed.
Insert the battery correctly.
a
Wrong battery.
a Check the battery.
Pressing buttons does
not perform opera-
tions.
Battery has run down.
a Replace the battery.
Remote control is facing in the wrong direction.
Direct the remote control at remote control sensor on the display unit.
a
TV
Problem
The intensity of the radio wave is too low.
a Change the broadcast station.
Unclear image due to
noise
Connection or installation of the TV antenna has not been performed correctly.
a Check the connection or installation.
Possible cause a Possible solution
Possible cause Possible solution
a
] (OPEN/CLOSE).
Possible cause a Possible solution
Possible cause a Possible solution
CQ-VD7700U/VD7500U
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