Canon TS5100 series Online Manual page 365

Press down the ink cartridge locking cover until it clicks into place.
• When copying, see also the sections below:
Is platen glass dirty?
Check6
Clean the platen glass.
Cleaning the Platen Glass and Document Cover
Make sure original is properly loaded on platen glass.
Check7
Loading Originals
Is original loaded with side to be copied facing down on platen glass?
Check8
Did you copy a printout done by this printer?
Check9
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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