Dell OptiPlex 7090 Tower Service Manual - Page 63

Installing the power-supply unit, power-supply unit and/or system components.

Page 63 highlights

Steps 1. Lay the computer on the right side. 2. Disconnect the power cables from the system board and unroute them from the routing guides on the chassis. 3. Remove the three (#6-32) screws that secure the power-supply unit to the chassis. 4. Press the securing clip and slide the power-supply unit away from the back of the chassis. 5. 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 procedure. WARNING: The cables and ports on the back of the power-supply unit are color-coded to indicate the different power wattage. Ensure that you plug in the cable to the correct port. Failure to do so may result in damaging the power-supply unit and/or system components. About this task The following images indicate the location of the power-supply unit and provide a visual representation of the installation procedure. Removing and installing components 63

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Steps
1.
Lay the computer on the right side.
2.
Disconnect the power cables from the system board and unroute them from the routing guides on the chassis.
3.
Remove the three (#6-32) screws that secure the power-supply unit to the chassis.
4.
Press the securing clip and slide the power-supply unit away from the back of the chassis.
5.
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 procedure.
WARNING:
The cables and ports on the back of the power-supply unit are color-coded to indicate the different
power wattage. Ensure that you plug in the cable to the correct port. Failure to do so may result in damaging the
power-supply unit and/or system components.
About this task
The following images indicate the location of the power-supply unit and provide a visual representation of the installation
procedure.
Removing and installing components
63