Canon iR1510 Reference Manual page 20

Closing the paper drawer
When closing the paper drawer, make sure to push it in completely as far as it will go. If copying is performed when the paper
drawer is not pushed in completely, it will cause a paper jam.
If copy paper is sticking out of the paper drawer
Sometimes, when you pull out the paper drawer, paper may stick out as shown in the illustration below. Make sure that the paper
is neatly loaded into the paper drawer before you push the paper drawer back into the main unit.
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