Lenovo System x3550 M5 Installation And Service Manual page 278

Step 5. Locate the microprocessor to be removed (see "System-board internal connectors" on page 26).
Step 6. Remove the heat sink.
Attention: Do not touch the thermal material on the bottom of the heat sink. Touching the thermal
material will contaminate it. If the thermal material on the microprocessor or heat sink becomes
contaminated, you must wipe off the contaminated thermal material on the microprocessor or heat
sink with the alcohol wipes and reapply clean thermal grease to the heat sink.
a. Use a screwdriver to loosen the captive screw on one side of the heat sink to break the seal
with the microprocessor.
b. Loosen all the captive screws on the heat sink, rotating each screw one full turn until each
screw is loose.
c. Gently lift the heat sink from the microprocessor. After removal, place the heat sink (with the
thermal grease side up) on a clean, flat surface.
Figure 192. Heat sink removal
Step 7. Open the microprocessor socket release levers and retainer.
Figure 193. Microprocessor socket levers and retainer disengagement
a. Identify which release lever is labeled as the first release lever to open and open it.
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Lenovo System x3550 M5 Installation and Service Guide
Heat sink
Microprocessor
release lever
Microprocessor
release lever