Panasonic CQ-C5403U - Manual (Page 35)

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The battery is inserted in the wrong direction. A wrong battery is inserted.
a Insert a correct battery in the correct direction.
The battery is weak.
a Replace the battery with new one.
The aiming direction of the remote control unit is wrong.
a Aim 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.)
a Block off sunlight to the sensor.
No response to press-
ing buttons
■
Remote control unit
Problem Possible cause a Possible solution