Lenovo ThinkCentre 6416 Maintenance Manual page 102

6. Connect the RJ11 modem cable to the new modem card.
7. Install the new modem card to the MDC connector on the system board by
aligning the holes in the modem card with the pins in the system board.
8. Install the two screws to secure the modem card to the system board.
9. Go to "Completing the FRU replacement" on page 103.
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Hardware Maintenance Manual