Dell OptiPlex 7020 (Mid 2014) - Manual (Page 23)

Installing the Thermal Sensor
1. Secure the thermal sensor to the chassis.
2. Thread the thermal-sensor cable into the chassis clips.
3. Connect the thermal-sensor cable to the system board.
4. Install the cover.
5. Follow the procedures in After Working Inside Your Computer.
Removing the Power Switch
1. Follow the procedures in Before Working Inside Your Computer.
2. Remove the:
a. cover
b. front bezel
c. optical drive
3. Disconnect the power-switch cable from the system board.
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