Lenovo 7D31, Maintenance Manual

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Step 3. Apply the thermal grease.
a. Carefully place the processor and carrier in the shipping tray with the processor-contact side
down. Make sure the triangular mark on the carrier is aligned with the triangular mark in the
shipping tray.
b. If there is any old thermal grease on the processor, gently wipe the top of the processor with
an alcohol cleaning pad.
Note:
Make sure the alcohol has fully evaporated before applying new thermal grease.
c. Apply the thermal grease on the top of the processor with syringe by forming four uniformly
spaced dots, while each dot consists of about 0.1 ml of thermal grease.
Figure 103. Thermal grease application with processor in the shipping tray
Step 4. Assemble the processor and heat sink.
Figure 104. Assembling the PHM with processor in shipping tray
a. Align the triangular mark on the heat sink label with the triangular mark on the processor carrier
and processor.
b. Install the heat sink onto the processor-carrier.
c. Press the carrier into place until the clips at all four corners engage.
Step 5. Install the processor-heat-sink module into the system board socket.
Chapter 4
.
Hardware replacement procedures
189