Lenovo ThinkCentre 3656 Hardware Maintenance Manual page 128

4. Position the replacement memory module over the memory connector. Make
5. Go to "Completing the FRU replacement" on page 141.
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Hardware Maintenance Manual
sure that the notch 1 on the memory module aligns correctly with the
connector key 2 on the system board. Push the memory module straight
down into the memory connector until the retaining clips close.