NEC Express5800/120Rh-2 N8100-1061F User Manual page 301

13.
Make sure that the heat sink is level.
NOTES:
If the heat sink is not level, remove it, and then install it again. The
following probably causes the heat sink not to be level:
– The CPU is not positioned correctly.
– All screws are not completely tightened.
Do not move the secured heat sink.
14.
Install the processor air duct.
15.
Install the support arm.
NOTE:
When the support arm comes up, you may lose the screws.
Press firmly the support arm before tightening the screws.
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