Samsung SL-M2875FD-XAA - Manual (Page 51)

Media and tray
51 2. Menu Overview and Basic Setup
3 Adjust the document feeder width guides to the paper size.
• Dust on the document feeder glass may cause black lines on the
printout. Always keep the glass clean (see "Cleaning the machine" on
page 84).
• To print on both sides of the paper using the ADF, from the control panel
press (Copy) > (Menu) > Copy Feature > Duplex > 1 -> 2
Sided or 1 -> 2 Sided Rot. and print on one side of the paper, then reload
the sheet to print on the other side.
Duplex printing might not be available for some models (see "Features
by model" on page 7).