Panasonic CQ-C7403U Manuel D'instructions page 36

Troubleshooting
Problem
Possible cause Possible solution
a
The battery is inserted in the wrong direction. A wrong battery is inserted.
aInsert a correct battery in the correct direction.
The battery is weak.
aReplace the battery with new one.
No response to
The aiming direction of the remote control unit is wrong.
pressing buttons
aAim the remote control unit at the sensor of the unit and press buttons.
The sensor is exposed to direct sunlight. (The remote control unit may not be
operable when the sensor is exposed to direct sunlight. In such a case, the
system is not faulty.)
aBlock off sunlight to the sensor.
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CQ-C7403U/C7303U/C7203U/C7103U