Troubleshooting, Preliminary steps, If you suspect something wrong – Panasonic CQ-VX2200W User Manual
Page 33: Common

A mobile phone is used near the unit.
a
Keep the mobile phone away from the unit.
Condensation (dew)
a
Wait for a while before use.
Cables are not correctly connected.
a
Connect cables correctly.
Mute is set to ON.
a
Set it to OFF.
Fuse is burnt.
a
Call the store where you purchased the unit, or your nearest Panasonic
Service Center and ask for fuse replacement.
Grounding wire is not correctly connected.
a
Connect the grounding wire to a metal part of the car.
Accessory cable is not correctly connected.
a
Connect the accessory cable to your car's ACC source.
Battery cable is not correctly connected.
a
Connect the battery cable to the terminal that is always live.
Cables are not correctly connected.
a
Connect cables correctly.
Car’s engine switch is not on.
a
Turn your car’s ignition switch to ACC or ON.
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Preliminary Steps
Check and take steps as described in the tables below.
If You Suspect Something Wrong
Immediately switch 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 yourself because it is dangerous to do so.
Cautions:
¡Do not use the unit if it malfunctions or
something is wrong.
¡Do not use the unit in abnormal conditions,
for example, without sound, or if it emits
smoke or a foul smell, which can cause
ignition or electric shock. Immediately stop
using the unit and call the store where you
purchased it.
Troubleshooting
Trouble
Cause / Step
No power
No sound
Noise
■
Common