Canon PC880 Operator's Manual page 23

5
Tilt the length guide over towards the inside of the cassette to
remove.
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6
Fit in the length guide into the length mark for the paper to be
loaded in the cassette.
...............................
7
Load the copy paper.
(See "How to Load Copy Paper in the Cassette" on p. 20.)
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INSTALLING THE COPIER
23