Lenovo ThinkPad T420si User Manual page 136

4. Loosen the screws on the memory slot cover (1), then remove the cover (2).
5. If a tool for removing connectors is included in the package with the new card, use it to disconnect the
cables from the card. If no such tool is included, disconnect the cables by picking up the connectors
with your fingers and gently unplugging them.
Note: Depending on the system configuration of your computer, the card may have only one connector.
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