Canon LBP7100Cn User Manual page 142

IMPORTANT
When loading envelopes
See "Printing on Envelopes" and load the paper in the correct orientation.
NOTE
When loading paper with a letterhead or logo
See "Paper Loading
4
Align the paper guides flush with the loaded paper.
Slide the paper guide at the front center while holding the lock release lever (A).
IMPORTANT
Be sure to align the paper guides flush with the paper.
If the paper guides are too loose or too tight, this may result in misfeeds or paper jams.
5
Make sure that the paper stack does not exceed the load limit mark lines (A).
Orientation" and load the paper in the correct orientation.
A5 paper
Statement paper
Custom size paper with a width and length (height) between
127.0 and 215.9 mm
If loading paper in landscape orientation, select the [Feed A5
Horizontally], [Feed Statement Horizontally], or [Feed Custom Paper
Horizontally] check box on the [Paper Source] sheet of the printer
driver when printing.