NEC NovaScale R480 E1 User Manual page 340

11.
Put the heat sink on the processor.
NOTE:
The heat sink can be installed both ways.
12.
Tighten the four screws to secure the heat sink.
13.
Make sure that the heat sink is level.
IMPORTANT:
positioned correctly.
If the heat sink is not level, remove it, and make sure that the processor is
9-56