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4-40 Sun Fire X2250 Server Service Manual • April 2009
7. Use the entire syringe contents to apply thermal grease in a circular pattern to
the top of the CPU.
Note – If you are replacing an existing heatsink with a new heatsink, you do not
need to use the syringe to add additional thermal grease to the heatsink, as new
heatsinks are pre-greased.
8. Gently distribute the thermal grease and remove any excess so that only an
extremely thin, uniform layer remains. If any voids or crevices appear that could
lead to air pockets, reapply the grease until you achieve a thin but compact
consistency.
9. Use an alcohol pad to remove all thermal grease from the bottom of the
heatsink.
10. Inspect the heatsink for dust and lint. Clean if necessary.
11. Carefully position the heatsink on the CPU, aligning it with the mounting posts
to reduce movement after it makes initial contact with the layer of thermal
grease.
Caution – If the heatsink is moved too much during its installation, the layer of
thermal grease may become uneven, leading to component damage.
12. Fasten the four screws attaching the heatsink to the motherboard. Alternate
between the four screws, turning each screw two turns until all are securely
fastened. See
FIGURE 4-35.