Replacing The Thermal Sensor - Lenovo ThinkCentre E73 Hardware Maintenance Manual

b. When handling the heat sink and fan assembly, do not touch the thermal grease on the bottom
of the heat sink and fan assembly.
8. Place the new heat sink and fan assembly on the system board so that the four screws are aligned with
the corresponding holes in the system board.
Note: Position the new heat sink and fan assembly so that the heat sink and fan assembly cable is
toward the microprocessor fan connector on the system board.
9. Follow the following sequence to install the four screws to secure the new heat sink and fan assembly.
Do not over-tighten the screws.
a. Partially tighten screw
b. Partially tighten screw
10. Connect the new heat sink and fan assembly cable to the microprocessor fan connector on the system
board. See "Locating parts on the system board" on page 72.
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 122.

Replacing the thermal sensor

Attention:
Do not open your computer or attempt any repair before reading and understanding the "Important safety information"
on page 1.
This section provides instructions on how to replace the thermal sensor.
To replace the thermal sensor, 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 82.
3. Remove the front bezel. See "Removing and reinstalling the front bezel" on page 83.
4. Locate the thermal sensor.See "Locating major FRUs and CRUs" on page 69.
5. Disconnect the thermal sensor cable from the thermal sensor connector on the system board. See
"Locating parts on the system board" on page 72.
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ThinkCentre E73 Hardware Maintenance Manual
1 , then fully tighten screw
3 , then fully tighten screw
2 , and then fully tighten screw
4 , and then fully tighten screw
1 .
3 .