Fujitsu PRIMERGY RX4770 M6 Upgrade And Maintenance Manual page 272

Processor (CPU)
▶ 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.
▶ Loosen the four captive screws one by one (in the sequence 4 to 1)
rotating them a half-turn each.
▶ Loosen the captive screws 4 and then 3 rotating them two or three turns
each.
▶ Repeat the step 2 until the screws 4 and 3 are completely loosened.
▶ Repeat the step 4 until the screws 2 and 1 are completely loosened.
Figure 159: Removing the heat sink (B)
272 Upgrade and Maintenance Manual RX4770 M6