Panasonic KX-TD816 Installation Manual page 78

2.4 Installation of Optional Cards and Unit
3.
Hook the cabinet on the main unit and slide the cabinet to the left until it is secured.
4.
Loosen the outside screw and slide the cover to the right.
5.
Secure the inside screw (included) to fix the cabinet to the main unit.
Note
Be sure to fix the inside screw to the main unit, or the unit may not work properly.
78
Outside screw
Inside screw
General Installation