Installing The Power Supply Unit - Dell Precision 3640 Tower Service Manual

Steps
1. Lift the side of the PCIe holder to release it from the graphics card and slide the holder out from the slot in the chassis.
2. Remove the two #6-32x1/4 screws that secure the power-supply bracket to the chassis and lift the power-supply bracket
from the system.
3. Remove the four #6-32x1/4 screws that secure the power-supply unit to the chassis and lift the PSU 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 provides a visual representation of the installation
procedure.
Disassembly and reassembly 55