Canon Color imageCLASS MF8170c Basic Manual page 37

Set the paper cassette into the machine.
Push the paper cassette into the machine firmly until the front side of the cassette is
flush with the front surface of the machine.
● Amount of Paper Remaining in the Cassette
The paper cassette has a display indicating the amount of paper remaining in
the cassette. If the cassette is full, the indicator will be at the top. The indicator
will go down as the amount of paper decreases. The indicator is helpful for
confirming the amount of paper remaining in the cassette.
Amount of Paper
Remaining
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