2.
Turn the 4 screws anticlockwise to loosen them.
Screws
3.
Pull the release lever in the direction of the arrow to disconnect the PSU from the back board.
Release Lever
4.
Replace the PSU.
New PSU
Current PSU
5.
Follow the steps in "Installing the Power Supply Unit".
Back Board
2.2 Installation of the Hybrid IP-PBX
Installation Manual
47