Dell EMC XC Core XC450 Installation And Service Manual page 48

a. Loosen the first screw three turns.
b. Loosen the screw diagonally opposite to the screw you loosened first.
c. Repeat the procedure for the remaining two screws.
d. Return to the first screw to loosen it completely.
2. Set the Anti-Tilt wires to the unlocked position (inward position).
Figure 41. Loosening the screws and set the Anti-Tilt wires to the unlocked position
3. Lift the processor and heat sink module (PHM) from the system and set the PHM aside with the processor side facing up.
Figure 42. Removing a processor and heat sink module
48 Installing and removing system components