Creo Color Controller C-80, Technical Manual

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2. Position the CPU fan and heat sink assembly in such a way that the fan wires
are close to the microprocessor fan, but do not obstruct other components.
3. Apply thermal grease to the top of the microprocessor.
Figure 35: Applying thermal grease
4. Align the spring screws holes in the CPU fan and heat sink assembly with their
corresponding holes on the system board. Insert the four spring screws and
tighten.
Thermal grease
Important: Make sure to insert and secure the spring screws using the
crisscross method. First insert screws 1 and 2, and lightly secure. Next insert
screws 3 and 4, and lightly secure. Once all four screws are in place, tighten
them diagonally, one after the other, in the order previously described, until
all four screws are tightened.