Installing The Power Supply Unit - Dell Vostro 3020 Service Manual

3. In a reverse sequential order (3>2>1), remove the three screws (#6-32) that secure the power supply unit on the chassis.
4. Slide and lift the power supply unit off the chassis.

Installing the power supply unit

Prerequisites
If you are replacing a component, remove the existing component before performing the installation process.
About this task
The following images indicate the location of the power supply unit and provide a visual representation of the installation
procedure.
36 Removing and installing components