Panasonic KX-TDA50 Manual page 25

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.
Screws
Note
Make sure the screws are tightened to earth the card securely.
3.2 Installing in the KX-TDA100/KX-TDA200/KX-TDA600 PBX
Back Board
Information about IP Proprietary Telephones 25