Oki C5100 - Manual (Page 8)

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2. Push out the lock tabs at either end of the DIMM socket.
Caution!
To avoid damage, ground yourself (touch metal) before handling DIMMs.
3. Remove the DIMM from its shipping package.
C5100, C5150n,
C5200ne, C5200n C5300, C5400, C5400n