Canon Satera LBP9500C User Manual page 31

 Slide the rear paper guide.
(1) Hold the lock release lever.
(2) Slide the paper guide to the position of the size of the paper to be loaded.
NOTE
3
Load paper so that the edges of the paper stack are aligned
with the rear paper guide.
30
† Align the position of (A) with the size mark of the paper to be loaded.
(1)
(A)
Size abbreviation on the paper guides
Paper Size
Ledger
Legal
Letter
(2)
Paper Guide
11 x 17
LGL
LTR