System Board - Lenovo ThinkStation P520 Hardware Maintenance Manual

11. Gently press down the small handle
down the small handle
Ensure that the new microprocessor is secured in the socket.
Note: There are two marks on the microprocessor retainer. Ensure that you close the small handle
marked with
sequence when you close the small handles.
Figure 176. Securing the microprocessor in the socket
12. Reinstall the heat sink and fan assembly.
13. If you are instructed to return the old microprocessor, follow all packaging instructions and use any
packaging materials that are supplied to you for shipping.
What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to "Completing the parts replacement" on page 202.

System board

Attention: Before you replace any FRU, be sure to read and understand Chapter 1 "Read this first:
Important safety information" on page 1.
CAUTION:
Avoid contact with hot components inside the computer. During operation, some components
become hot enough to burn the skin. Before you open the computer cover, turn off the computer,
disconnect power, and wait approximately 10 minutes for the components to cool.
To remove or install the system board, do the following:
1. Prepare your computer. See "Preparing your computer and removing the computer cover" on page 103.
2. Lay the computer on its side for easier access to the system board.
3. To get access to the system board, remove the following parts if any:
• "PCIe card" on page 153
• "Full-length PCIe card" on page 159
• "Super capacitor module" on page 163
• "Memory module" on page 168
• "M.2 solid-state drive" on page 140
• "Power supply assembly" on page 151
• "Heat-sink-and-fan assembly" on page 162
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P520 Hardware Maintenance Manual
2 and then push the handle inward to secure it. Then gently press
1
and push the handle inward to lock the microprocessor retainer into position.
first and then close the small handle marked with . Always follow the correct