Canon LBP7210Cdn Manual page 269

Handle paper carefully not to cut your hands with the edges of the paper.
IMPORTANT
Be sure to load paper in portrait orientation.
Multi-purpose tray capacity
Paper Type
2
Plain paper (Ex. 80 g/m )
2
Heavy paper (Ex. 91 g/m
Heavy paper (Ex. 128 g/m
Be sure that the paper stack does not exceed the load limit mark lines. If the paper stack exceeds
the load limit mark lines, this may result in misfeeds.
Precautions when loading paper in the multi-purpose tray
Load the paper so that it is straight.
If the rear edge of the paper stack is not properly aligned, this may result in
misfeeds or paper jams.
If the paper is curled or folded at corners, flatten it before loading it in the printer.
If you use paper that has been poorly cut, multiple sheets of paper may be fed at
once. In this case, fan the paper thoroughly, and then align the edges of the stack
properly on a hard, flat surface.
NOTE
When printing paper with a letterhead or logo
See "Paper Loading Orientation"
Align the paper guides with the width of the paper.
Paper Capacity
Approx. 50 sheets
Approx. 30 sheets
)
2 ) Approx. 20 sheets
and load the paper in the proper orientation.