Samsung ML-1651N - Manual (Page 115)

P
ROBLEM
S
OLVING 7.24
Solving Print Quality Problems
• Reset the printer by briefly turning the printer off and back on again.
• If the error persists, contact the service representative.
System error
The size of the paper in the input tray is mismatched to the Paper Size
setting in printer's properties. Remove the paper from the tray and load the
paper of same size as you have set in the properties. Press the Demo
button to ignore the message and feed paper from the corresponding input
tray.
Paper Mismatch