Ricoh SP C400DN User Manual page 47

Attaching Memory Unit Type D 128MB, Memory Unit Type E 256MB (SDRAM Module)
F
When installing an SDRAM module in a vacant slot, align the notch of the
SDRAM module with the slot, and then insert the module vertically.
G
Press down the SDRAM module, until it clicks into place.
H
When replacing the default SDRAM module, press down the levers on
both sides ( ) to remove the default module ( ).
Install a new SDRAM module.
To increase memory capacity to the maximum of 512 MB, remove the default
SDRAM module, and then install two 256 MB SDRAM modules.
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