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Chapter 4 Maintaining the Sun Fire X4200 Server 4-15
f. If you are reinstalling an existing CPU or heatsink, use an alcohol pad to clean
all old thermal grease from the component surface.
Caution – Ensure that the thermal grease in the syringe supplied with the CPU is
pliable and not stiff. If your syringe of grease has aged, the grease might be too stiff
to adequately spread out and ensure thermal conductance.
g. Use one syringe of thermal grease (one ml) to carefully apply grease to the top
of the CPU in three lines in the pattern shown in
FIGURE 4-12.
Note – Two syringes of thermal grease are supplied with the new CPU, but use only
one syringe for each CPU. Apply the grease in the pattern shown in FIGURE 4-12.
FIGURE 4-12 Required Pattern for Thermal Grease Application
7. Turn the heatsink upright and reinstall the two springs and mounting bolts.
Caution – Avoid moving the heatsink after it has contacted the top of the CPU. Too
much movement could disturb the layer of thermal grease, leading to component
damage.
8. Carefully position and align the heatsink over the CPU.
CPU surface
Lines of thermal grease