Canon Voice Operation Kit User Manual page 108

Platen Glass
You should use the platen glass when
copying bound originals (such as books and
magazines), heavy or lightweight originals, and
2 transparencies. (See "Paper Selection," on p.
2-40.)
The machine automatically detects the size of
the following originals: 11" x 17", LGL, LTR, and,
LTRR, and STMTR/A3, B4, A4, A4R, B5, B5R, A5,
and B6.
1
2-28 Placing Originals
Lift the feeder.
Sensor