Canon G4000 series Online Manual page 456

When using paper with one printable surface, make sure paper is loaded with
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printable side facing up.
Printing on the wrong side of such paper may cause unclear prints or prints with reduced quality.
Load paper with the printable side facing up.
Refer to the instruction manual supplied with the paper for detailed information on the printable side.
• When copying, see also the sections below:
Is platen glass or glass of ADF dirty?
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Clean the platen glass or the glass of ADF.
Cleaning the Platen Glass and Document Cover
Cleaning the ADF (Auto Document Feeder)
Note
• If the glass of ADF is dirty, black streaks appear on the paper as shown below.
Make sure original is loaded correctly on platen glass or in ADF.
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Loading Originals
Is original document is loaded with proper side facing up/down?
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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.
Did you copy a printout done by this printer?
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If you use a printout done by this printer as the original, print quality may be reduced depending on the condition
of the original.
Print from the printer directly, or reprint from the computer if you can reprint from it.
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