Lenovo x3550 M5 - Page 280

•Donottouchthethermalgreaseonthebottomoftheheatsinkafteryouremovetheplastic
cover.Touchingthethermalgreasewillcontaminateit.See“Thermalgrease”onpage267
formoreinformation.
Thermal
grease
Heat
sink
Figure200.Thermalgrease
a.Removetheplasticprotectivecoverfromthebottomoftheheatsink.
b.Positiontheheatsinkoverthemicroprocessor.Theheatsinkiskeyedtoassistwithproper
alignment.
Heat Sink
Figure201.Heatsinkinstallation
c.Alignandplacetheheatsinkontopofthemicroprocessorintheretentionbracket,thermal
materialsidedown.
d.Pressfirmlyontheheatsink.
e.Pressdownonthecenteroftheheatsink;then,pressfirmlyonthecaptivescrewsandtighten
them,alternatingbetweenthescrewsinafigure-8patternasillustratedontheheatsinklabel
untiltheyaretightened.Youcancausedamagetothemicroprocessorifyoutightenthe
screwsononesidefirst,ratherthanrotating.Rotateeachscrewonefullrotationatatime.
Repeatthisprocessuntilthescrewsaretightened.
Step10.Reinstalltheairbaffle(see“Replacingtheairbaffle”onpage122).
266LenovoSystemx3550M5InstallationandServiceGuide