Canon PIXMA MG4200 Series On-Screen Manual page 862

After confirming that the FINE cartridge is installed properly, close the paper output cover.
If the problem is not resolved, remove the FINE cartridges, then install them again.
Refer to Replacing a FINE Cartridge
When copying, see also the sections below:
Check 6: Is the platen glass dirty?
Clean the platen glass.
Cleaning the Platen Glass and Document Cover
Check 7: Make sure that the original is properly loaded on the platen
glass.
Loading 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?
If you use a printout done by this machine as the original, print quality may be reduced depending on
the condition of the original.
Print from the machine directly, or reprint from the computer.
for how to install the FINE cartridges.
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