Panasonic KX-TDA100

3. Turn the 4 screws clockwise, in the order indicated by the numbers 1 to 4, to fix the PSU.
Screws
1
3
2
4
Replacing the Power Supply Unit
1. Unplug the AC power cord and Back-up Battery Cable.
2. Turn the 4 screws anticlockwise to loosen them.
Screws
48 Installation Manual
2.2.4 Installing/Replacing the Power Supply Unit