Canon MB2300 series Online Manual page 729

Once you have prepared the envelopes, load them in portrait orientation. If the envelopes are placed in
landscape orientation, they will not feed properly.
Confirm that the media type and the paper size settings correspond with the
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loaded paper.
Clean the paper feed roller.
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Cleaning the Paper Feed Roller
Note
• Cleaning the paper feed roller will wear the roller, so perform this procedure only when necessary.
If two or more sheets of paper feed from the cassette at once, clean the inside
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of the cassette.
For information on cleaning the inside of the cassette, refer to
If you cannot remove the paper or the paper tears inside the machine, or if the paper jam error continues
after removing the paper, contact the service center.
Cleaning the Pad in the
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Cassette.