[. . . ] B721dn/B731dn/MPS5501 - Installing Additional RAM Install additional RAM to increase the memory capacity of your printer in cases such as if occur. [. . . ] 1 Turn off your printer, and then unplug all the cables from the printer. Reference � Be careful of the orientation of the additional RAM. The additional RAM has small dents on its connector, � "Turning Off the Power" P. Insert the right side of the metal plate (2) into the printer, close it, then secure it by tightening the screw. 8 Plug the AC cable and removed cables into your printer, and then turn on the power switch. On the operator 9 - For memory expanded to 512 MB, it is [768 MB]. [. . . ] 12 Press the scroll button several times to select [RAM] then press the <ENTER> button. [. . . ]