Lenovo ThinkPad SL300 2738 Supplementary Manual page 48

6. If the two SO-DIMMs are already installed in the memory slots, remove
ThinkPad SL 300:
ThinkPad SL 400 and SL500:
7. Find the notch on the contact edge of the SO-DIMM.
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ThinkPad SL300, SL400, and SL500 Service and Troubleshooting Guide
an SO-DIMM to make room for the new one by pressing out on the
latches on both edges of the socket at the same time. Be sure to save it
for future use.
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Attention: To avoid damaging the SO-DIMM, do not touch its contact
edge.
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