IBM ThinkCentre 8171 Replacement Manual page 19

4. Release the lever 1 holding the microprocessor heat sink.
5. Remove the heat sink, and do one of the following:
v If you are replacing the microprocessor, place the old heat sink aside. You
must use the new heat sink shipped with the new microprocessor.
Note
Do not use the old heat sink with the a new microprocessor. If you use
the old heat sink with the new microprocessor, your computer might
overheat causing intermittent problems.
v If you are replacing the system board, carefully place the heat sink on its
side on a clean, flat surface so the thermal interface on the bottom of the
heat sink does not touch the surface and become contaminated.
6. Release the lever 3 holding the microprocessor retainer 1 , and pivot the
retainer to the open position.
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Replacing customer replaceable units (CRUs)
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