Lenovo H520s Hardware Maintenance Manual page 46

Step 6. Remove the heat-sink. Refer to "Replacing the heat-sink".
Step 7. To remove the microprocessor
to spring it up.
Attention: Do not touch the gold contacts on the bottom of the microprocessor. When handing the
microprocessor, touch only the sides.
Note: Do not drop anything onto the microprocessor socket while it is exposed. The socket pins must
be kept as clean as possible.
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Lenovo H520sHardware Maintenance Manual
3 from the system board, press then slide the small handle out
1 and open the retainer. 2