Fujitsu PRIMERGY CX2550 M6 Upgrade And Maintenance Manual page 174

Processor (CPU)
Removing the heat sink
Figure 104: Removing the heat sink (A)
▶ Loosen the captive screws (circles) following the sequence described below
and using a Torx screw driver:
CAUTION
▶
Please do not use an electric screwdriver.
There is a possibility the washer on the heat sink mounting screw
may be damaged. Ensure to follow the removing procedure as below.
1. Loosen the four captive screws one by one (in the sequence 4 to 1)
rotating them a half-turn each.
2. Loosen the captive screws 4 and then 3 rotating them two or three turns
each.
3. Repeat the step 2 until the screws 4 and 3 are completely loosened.
4. Loosen the captive screws 2 and then 1 rotating them two or three turns
each.
5. Repeat the step 4 until the screws 2 and 1 are completely loosened.
174 Upgrade and Maintenance Manual