Canon mp280 - Manual (Page 618)

Printing on the wrong side of such paper may cause unclear prints or prints with reduced quality.
Refer to the instruction manual supplied with the paper for detailed information on the printable side.
Check 6: Is the Platen Glass dirty?
Clean the Platen Glass.
Cleaning the Platen Glass and Document Cover
When copying, see also the sections below:
Check 7: Make sure that the original is properly loaded on the Platen
Glass.
Loading Paper / Originals
Check 8: Is the original loaded with the side to be copied facing down
on the Platen Glass?
Check 9: Did you copy a printout done by this machine?
Reprint from the computer.
If you copy a printout done by this machine, print quality may be reduced.
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Page 618 of 707 pages No Printing Results/Printing Is Blurred/Colors Are Wrong/White Streaks