Oki C5100 - Manual (Page 9)

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4. Insert the DIMM in the socket:
• C5100, C5150n, C5200ne, C5200n: Hold the DIMM vertically, with the
narrower metallic contact edge ( 1) at the bottom.
• C5300, C5400, C5400n: Hold the DIMM horizontally, with the narrower
metallic contact edge ( 1) to the right.
5. Press the DIMM in firmly, until you feel the tabs snap to lock it in place.
Note : You may need to push the tabs in manually to secure the DIMM.
C5100, C5150n,
C5200ne, C5200n
C5300, C5400, C5400n