Dell OptiPlex 390 (Mid 2011) - Manual (Page 55)

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Power Supply Unit (PSU) Thermal
Sensor
Removing The PSU 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 power supply and remove from the
chassis.
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