NEC Express5800 series User Manual page 101

When performing the next step, be very careful that the
screwdriver does not slip out of the clip, as the system board
can be damaged.

Using your thumb, press down on this end of the clip until it clears
the bottom edge of the tab on the retention module and rotate the
screwdriver as shown in Figure 4-12 until the end of the clip is free of
the tab.

Using the screwdriver, release the other end of the clip.
Figure 4-13. Removing the Heat Sink Clip

With both ends of the clip released, rotate the clip away from the heat
sink to disengage it from the center tab on the retention module. See
Figure 4-13. The clip is rotated over the top of the center tab.
Sometimes it's easier to slide the clip to release it from the center
retention tab.

Lift the heat sink straight out of the retention module.
8. Raise the locking bar on the socket.
9. Remove the processor from the socket.
! CAUTION
Upgrading Your System 4-19