Dell OptiPlex 390 (Mid 2011) - Manual (Page 39)

Front Thermal Sensor
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Removing the Front Thermal Sensor
1. Follow the procedures in Before Working Inside Your Computer .
2. Remove the cover .
3. Disconnect the thermal sensor cable from the system board.
4. Unthread the thermal sensor cable from the chassis clip.
5. Pry the thermal sensor away from the chassis front and remove.
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