Panasonic KX-TDA0490 Getting Started page 16

2.1 Installation
2.
Holding the card as shown below, push the release lever in the direction of the arrow so that the
card engages securely with the connector on the back board.
Release Lever
3.
Turn the 2 screws clockwise to fix the card in place.
Note
Make sure the screws are tightened to earth the card securely.
16 Getting Started
Screws
Back Board