Lenovo thinkcentre M700 User Manual page 77

To replace the heat sink and fan assembly, do the following:
1. Remove any media from the drives and turn off all connected 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 52.
3. Locate the heat sink and fan assembly. See "Computer components" on page 6.
4. Lay the computer on its side. Then, disconnect the heat sink and fan assembly cable from the system
board.
5. Loosen the four screws that secure the heat sink and fan assembly to the system board in the following
sequence:
a. Partially remove screw
b. Partially remove screw
Note: Carefully remove the four screws from the system board to avoid any possible damage to the
system board. The four screws cannot be removed from the heat sink and fan assembly.
Figure 30. Removing the heat sink and fan assembly
6. Lift the failing heat sink and fan assembly off the system board.
Notes:
• You might have to gently twist the heat sink and fan assembly to free it from the microprocessor.
• Do not touch the thermal grease while handling the heat sink and fan assembly.
7. Position the new heat sink and fan assembly on the system board so that the four screws are aligned
with the holes in the system board. Ensure that the heat sink and fan assembly cable faces toward the
microprocessor fan connector on the system board.
8. Tighten the four screws to secure the new heat sink and fan assembly in the following sequence. Do
not over-tighten the screws.
a. Partially tighten screw
b. Partially tighten screw
9. Connect the heat sink and fan assembly cable to the microprocessor fan connector on the system
board. See "Parts on the system board" on page 7.
10. Place the computer in an upright position.
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 70.
1 , fully remove screw 2
3 4
, fully remove screw
1 2
, fully tighten screw
3 , fully tighten screw 4
, and then fully remove screw
, and then fully remove screw
, and then fully tighten screw
, and then fully tighten screw
.
Chapter 7 Installing or replacing hardware
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