QNAP TS-251+ - Page 55

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3. Loosen the two screws on the rear of the NAS.
4. Hold the notch at the edge of the top cover. Remove the top cover in both hands.
5. Loosen the screw and remove the expansion slot cover.
6. Grasp the edge of the expansion card. Align the notch on the gold edge of the card with
the notch in the PCIe slot. Insert the network expansion card to the PCIe slot until it
cannot go any further.