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that the PSU case be securely fastened to the PBX chassis with the 4 screws provided with each PSU. When installing or replacing PSU, basic safety precautions should always be followed to reduce the risk of fire, electric shock and injury to persons, including the following:
1. Never install or replace PSU during a lightning storm. 2. Never install or replace PSU in wet locations. 3. Never install or replace PSU unless 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, touch ground or wear an earthing strap.
The following procedures are for installing or upgrading a PSU only. Do not replace or remove the PSU for ny other purpose.
5.1.2. Installing the Power Supply Unit
1. Insert the PSU along the guide rails.
Caution:
For safety reasons, do not touch parts in the PSU.
2. Push the release lever in the direction of the arrow, so that the PSU is made to engage with the connector on the back board securely.
