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Dell Vostro 3890 Service Manual page 33

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Steps
1. Disconnect the power cables from the system board and unroute them from the routing guides on the chassis.
NOTE:
The power-supply cable is connected to the system board at two locations and supply power to the following
components at the two location:
● Processor - ATX CPU connector
● System board - ATX SYS connector
2. Remove the three (#6-32) screws that secure the power-supply to the chassis.
3. Press the securing clip to release the power-supply unit from the chassis.
4. Slide and lift the power-supply unit from its slot on 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 provides a visual representation of the installation
procedure.
Disassembly and reassembly
33

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