Canon PIXMA MX870 - Manual (Page 958)

Check 5: When using paper with one printable surface, make sure that
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 or the glass of ADF dirty?
Clean the Platen Glass or the glass of ADF.
Cleaning the Platen Glass and Document Cover
When copying, see also the sections below:
Check 7: Check that the original is loaded correctly on the Platen Glass
or in the ADF.
Loading Paper / Originals
Check 8: Is the original document is loaded with the proper side facing
up?
When loading the original on the Platen Glass, the side to be copied should be face down. When
loading the original in the ADF, the side to be copied should be face up.
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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