Lenovo M4350 Desktop - Manual (Page 100)

The failing system board must be returned with a microprocessor socket cover to protect the pins during
shipping and handling.
To install the microprocessor socket cover, do the following:
1. Release the lever securing the microprocessor retainer and open the retainer to access the
microprocessor.
2. Grasp the microprocessor on the sides and lift it straight up and out of the socket. Do not touch the
contacts on the microprocessor socket.
3. Lower the microprocessor retainer, and then lower the lever to secure the retainer. Make sure the
lever is locked into position.
4. Note the orientation of the socket cover, and install one side of the socket cover into the microprocessor
socket.
Figure 34. Installing one side of the socket cover into the microprocessor socket
Note: Your microprocessor socket and cover might look slightly different from the illustration.
5. Carefully press the other side of the socket cover downward until the socket cover snaps into position.
6. Carefully check the four corners of the socket cover to make sure that the cover is secured in the
microprocessor socket.
7. Follow any additional instructions included with the replacement part you received.
Replacing the WiFi units
Attention:
Do not open your computer or attempt any repair before reading and understanding the Chapter 1 “Safety
information” on page 1.
This section provides instructions on how to replace the WiFi units. The WiFi units include a WiFi adapter
card, a WiFi card module, and a rear WiFi antenna cable.
Replacing the WiFi units involves the following operations:
• “Removing the WiFi adapter card” on page 94
• “Removing the WiFi card module” on page 96
• “Installing the WiFi units” on page 97
Removing the WiFi adapter card
To remove a WiFi adapter card, do the following:
1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Remove the computer cover. See “Removing the computer cover” on page 69.
94 Lenovo M4350 Hardware Maintenance Manual