Lenovo ThinkPad Z61e Troubleshooting Manual page 44

Replacing memory
9. With the notched end of the SO-DIMM toward the contact edge side of
10. Attach the palm rest cable connector to the system board firmly.
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ThinkPad Z61 Service and Troubleshooting Guide
the socket, firmly insert the SO-DIMM into the socket at an angle of
about 20 degrees 1 ; then pivot it downward until it snaps into place
2 .