Canon MG8100 series On-Screen Manual page 962

the paper is loaded with the printable side facing up.
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?
Print from the memory card, from the USB flash drive, or from the digital camera directly, or reprint
from the computer.
If you copy a printout done by this machine, print quality may be reduced.
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