Lenovo ThinkCentre 7515 Maintenance Manual page 137

If you are replacing an old memory module, open the retaining clips and
remove the memory module being replaced as shown.
Figure 45. Removing the old memory module
6. Position the memory module over the memory slot. Make sure that the notch
1 on the memory module aligns correctly with the slot key 2 on the system
board. Push the memory module straight down into the slot until the retaining
clips close.
Figure 46. Installing the memory module
What to do next:
v To work with another option, go to the appropriate section.
v To complete the installation, go to "Completing the FRU replacement" on
page 155.
Chapter 9. Replacing FRUs - 607 computers
131