Lenovo M5400 Touch Notebook - Manual (Page 47)

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Lenovo B5400/M5400/M5400 Touch
Figure 6. Removal steps of PCI Express Mini Card for wireless LAN (continued)
Remove the card in the direction shown by arrow
3
.

When installing:
When installing the wireless LAN card, plug the black cable into the jack
labeled AUX and the white cable into the jack labeled MAIN.