Dell OptiPlex 380 Service Manual - Page 48

Disconnect the fan power cable from the system board., Pull up on the retention tab that is closest

Page 48 highlights

4. Disconnect the fan power cable from the system board. 5. Pull up on the retention tab that is closest to the top of the computer.

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4.
Disconnect the fan power cable from the system board.
5.
Pull up on the retention tab that is closest to the top of the computer.