Lenovo 10B0 Maintenance Manual page 174

To replace the system board, do the following:
1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.
2. Remove the computer cover. See "Removing the computer cover" on page 136.
3. Remove the front bezel. See "Removing and reinstalling the front bezel" on page 136
4. Pivot the drive bay assembly upward. See "Accessing the system board components and drives" on
page 138.
5. Remove all memory modules and PCI Express cards that are currently installed. See "Installing or
replacing a memory module" on page 141 and "Installing or replacing a PCI Express card" on page 139.
6. Remove the heat sink and fan assembly from the failing system board. See "Replacing the heat sink and
fan assembly" on page 158.
Note: Do not let the thermal grease on the bottom of the heat sink and fan assembly get in contact
with anything.
7. Record the cable routing and cable connections and then disconnect all cables from the system board.
8. Remove the six screws that secure the system board.
Figure 112. Removing the screws that secure the system board
9. Slide the system board to the front of the computer and then carefully lift the system board out of the
chassis. Place the failing system board on a flat, clean, and static-protective surface.
10. Remove the microprocessor from the failing system board and install it on the new system board. See
"Replacing the microprocessor" on page 164.
168
ThinkCentre M73 Hardware Maintenance Manual