Samsung ML-4512ND-XAA - Manual (Page 35)

Media and tray
35 2. Menu overview and basic setup
6 Squeeze the paper width guide and slide it to the edge of the
paper stack without causing it to bend.
• Do not push the paper width guide too far causing the
media to warp.
• If you do not adjust the paper width guide, it may cause
paper jams.
• Do not use a paper with a leading-edge curl, it may cause
a paper jam or the paper can be wrinkled.
7 Insert the tray back into the machine.
8 Set the paper type and size for tray 1 (see "Setting the paper
size and type" on page 42).