Canon Color imageCLASS MF8170c Basic Manual page 150

Paper stacked roughly.
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Repeated paper jams occur.
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9
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Envelopes do not feed correctly.
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9-28 Paper Feeding Problems
Is the proper paper loaded?
Check if the proper paper is loaded in the cassette or multi-purpose tray. (See
Chapter 2, "Paper Handling.")
Check if the appropriate paper type is selected in <PAPER TYPE> in <PAPER
SETTINGS> of the Menu. (See "Specifying the Paper Type," on p. 2-20.)
Is the proper paper loaded?
Check that the size, thickness and type of the paper you are using. (See "Print
Media Requirements," on p. 2-1.)
Is the proper paper loaded correctly?
Be sure to fan the paper stack before loading it in the cassette. This keeps the
sheets of paper from sticking together.
Is the output tray free of obstructions?
Do not place the delivered paper back on the output tray. (See "Face Down
Paper Output Area," on p. 2-23.)
Do not place objects other than paper on the output tray. (See "Face Down
Paper Output Area," on p. 2-23.)
Is the machine installed in a proper location?
Check that the machine is installed in the proper location. (For information
about specifications of the machine, see "Specifications," on p. 11-1. For safety
warnings and cautions, see "Installation," on p. xiv.)
Are the envelopes loaded correctly?
Make sure the envelopes are loaded correctly. (See "Loading Envelopes in the
Multi-Purpose Tray," on p. 2-14.)
Is the proper envelope loaded?
Load the recommended envelopes (COM10, MONARCH, DL, or ISO-C5) in the
multi-purpose tray. (See "Loading Envelopes in the Multi-Purpose Tray," on p.
2-14.)