Panasonic CQ-DF402U Operating Instructions Manual page 23

Remove the Unit
Switch off the power of the unit.
Remove the removable face plate.
O Press [OPEN]. The removable face plate will
be opened.
Main unit
© Push the face plate to either the right or left.
Gh Pull it out toward you.
© Remove the trim plate (8) with a screwdriver.
Pull out the unit while pushing down the lock
3 lever with a screwdriver.
Remove the unit pulling with both hands.