Lenovo THINKCENTRE 4485 - Manual (Page 156)

3. Locate the system board and disconnect all cables connected to the system board. See “Locating
parts on the system board” on page 77.
4. Remove the heat sink and fan assembly with the fan duct. See “Replacing the heat sink and fan
assembly” on page 139.
Note: Do not let the thermal grease on the bottom of the heat sink and fan assembly get in contact
with anything.
5. Lift the small handle 1 and open the retainer 2 to access the microprocessor 3 .
Figure 85. Accessing the microprocessor
6. Lift the microprocessor straight up and out of the microprocessor socket.
Figure 86. Removing the microprocessor
Notes:
a. Your microprocessor and socket might look different from the one illustrated.
148 ThinkCentre Hardware Maintenance Manual