Dell OptiPlex NX1 - Manual (Page 106)

5-14 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. Free the system power supply from the securing tab labeled
“ RELEASE—> ,” and rotate it to the right until it stops.
Press the securing tab to the left to release the power supply.
3. Disconnect the DC power cables from the system board and the drives.
4. Lift the front end of the system power supply up, and move it to the right
to disengage the power supply from the slot in the chassis.
5. Lift the system power supply from the computer.
DC power
cables
power
supply
securing tab
slot