56 CQ-C9800/9700U
CQ-C9800/9700U 57
Troubleshooting
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Preliminary Steps

Check and take steps as described in the tables below.

If You Suspect Something Wrong

Immediately switch the power off.
Disconnect the power connector and check that there is
neither smoke nor heat from the unit before asking for
repairs. Never try to repair the unit by yourself because it
is dangerous to do so.
Caution:
≥ Do not use the unit if it malfunctions or if
there is something wrong.
≥ Do not use the unit in abnormal condition,
for example, without sound, or with smoke
or foul smell, which can cause ignition or
electric shock. Immediately stop using it and
call the store where you purchased it.

Troubleshooting Tips

Common

No power to the unit. The power cord (battery, ACC and
ground) is connected in the wrong
way.
Check the wiring.
Fuse blow out. Eliminate the cause of fuse blow out
and replace the fuse with new one.
Consult your dealer.
Problem Possible cause Possible solution
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 the 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.
Problem Possible cause Possible solution
Noise is made in
step with engine
revolutions.
Alternator noise comes from the
car.
Change the wiring position of the
ground lead.
No sound from
speaker(s)
Balance/fader setting is not
appropriate.
Readjust balance/fader.
There is a break, a short circuit,
poor contact or wrong wiring
regarding the speaker wiring.
Check the speaker wiring.
Some speakers are out of order. Replace the speaker with new one.
The speaker channels
are reversed between
right and left.
The speaker wiring is confused
between right and left.
Perform the speaker wiring in
accordance with the wiring diagram.
Poor reception or
noise
Antenna installation or wiring of
antenna cable is faulty.
Check whether the antenna mounting
position and its wiring are correct.
In addition, check to see whether the
antenna ground is securely connected
to the chassis.
No power is supplied to the
antenna amplifi er (when using a
fi lm antenna, etc.).
Check the wiring of the antenna
battery lead.
The number of auto
preset stations are
less than 6.
The number of receivable stations
are less than 6.
Move to an area where receivable
stations number is maximum, and try
presetting.
Preset stations cannot
be stored.
The contact of the battery lead is
poor, or the battery lead is not
always powered.
Make sure that the battery lead is
connected securely, and preset
stations again.
Mount a noise fi lter on the power supply.

Radio

Sound is not
generated.
MUTE is set to ON. Set MUTE to OFF.
The wiring of the speaker lines
are not correct, or a break or poor
contact arises.
Check the wiring in accordance with
the wiring diagram.
The demonstration
screen displayed and
no operable.
You cannot operate the unit while
the demonstration screen appears.
Press [DISP] (display) to end the
demonstration screen.
If the demonstration screen
appears frequently, there is a
possibility that poor contact or
wrong wiring arises between the
battery lead of the unit and the
battery cable of the car.
(The battery lead should be always
powered.)
Check the battery wiring in accordance
with the wiring diagram.
Some operations are
not executable.
Some operations are not executable
in particular modes such as menu
mode.
Read the operating instructions
carefully and cancel the mode. In case
the unit is still out of order, consult the
dealer.
The Power fails
unintentionally.
The safety device works. Call the store where you purchased
the unit, or your nearest Panasonic
Servicenter.
Problem Possible cause Possible solution