Samsung SF-755P - Manual (Page 203)

A PPENDIX A.2
Installing an Optional Tray
You can increase the paper handling capacity of your machine by
installing an optional Tray 2. This tray holds 250 sheets of paper.
1 Turn the machine off and unplug all cables from the
machine.
2 Remove the packing material from the tray and remove the
tape fixing the interface cable to the tray.
3 Find the location of the optional tray positioners.