Lenovo ThinkSystem ST50 V2 Maintenance Manual page 102

Figure 72. Removing the four screws securing the heat sink fan to the chassis
Step 4. Loosen screw 1 and 2 first; then loosen screw 3 and 4.
a. Partially loosen screw 1.
b. Fully loosen screw 2.
c. Fully loosen screw 1.
d. Partially loosen screw 3.
e. Fully loosen screw 4.
f. Fully loosen screw 3.
Notes:
1. Gently remove the four screws to avoid any possible damage to the system board.
2. Always keep the four screws attached to the heat sink and fan module.
3. Do not touch the thermal grease while handling the heat sink and fan module.
Loosening the screws on the heat sink and fan module for processor with TDP lower than
95W
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