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3.2 Installation of the PBX
Installation Manual 53
3. Never install or replace a PSU unless at least 20 s has elapsed after the AC supply and backup
battery supply are disconnected.
4. To protect the back board from static electricity, do not touch parts on the back board in the main
unit and PSU. To discharge static electricity, touch ground or wear an earthing strap.
The following procedures are for installing or replacing a PSU only. Do not replace or remove the
PSU for any other purpose.
Installing the Power Supply Unit
1. Insert the PSU along the guide rails.
CAUTION
For safety reasons, do not touch parts in the PSU.
Guide Rail