Dell OptiPlex NX1 - Manual (Page 82)

4-12 Dell OptiPlex GX1/GX1p Managed PC and OptiPlex NX1 Net PC Systems Service Manual
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To remove the system power supply, follow these steps:
1. Disconnect the AC power cable from the back of the power supply.
2. Disconnect the DC power cables from the system board and the drives.
3. Remove the power-supply mounting screw at the back of the chassis.
4. Slide the system power supply forward until it stops; then lift it from the
chassis.
When you replace the system power supply, place it down inside the chassis
and against the right side of the chassis. Then slide the system power supply
toward the back of the chassis, and hook the tabs into the right side of the
power supply.
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power supply
power-supply
mounting screw