TYAN Tank GT24 (B5377 Service Manual page 58

2. Disconnect the power cables from the power board (PW1
and PW2 connectors). Remove the two screws that
secure the power supply to the chassis
3. Lift the power supply free from the chassis.
4. Remove the two screws securing the PSU fixing bracket
to the power supply.
5. Place a new power supply in position in the chassis and
secure in place with the two screws.
50 Chapter 3: Replacing Pre-Installed Components