Lenovo ThinkPad SL300 2738 Hardware Maintenance Manual page 78

Table 16. Removal steps of PCI Express Mini Card (full size) for wireless WAN (continued)
3
When installing: Plug the black cable with red label into the jack labeled
MAIN, and the black cable with blue label into the jack labeled AUX on the
card.
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ThinkPad SL300 Hardware Maintenance Manual