Dell OptiPlex 390 (Mid 2011) - Manual (Page 40)

7. Pry the thermal sensor away from the chassis front and remove.
Installing The Front Thermal Sensor
1. Secure the thermal sensor to the chassis front.
2. Thread the thermal-sensor cable into the chassis clips.
3. Connect the thermal-sensor cable to the system board.
4. Install the
front bezel .
5. Install the cover .
6. Follow the procedures in After Working Inside Your Computer .
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