Lenovo THINKCENTRE 6019 Hardware Maintenance Manual page 98

5. Position the replacement memory module over the memory connector. Make
6. Go to "Completing the FRU replacement" on page 112.
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Hardware Maintenance Manual
sure 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
connector until the retaining clips close.