Canon PIXMA MP140 Series Quick Start Manual page 10

Important
Do not place any objects weighing more than 4.4 lb / 2 kg on the Platen Glass.
Do not press or put weight on the original with pressure exceeding 4.4 lb / 2 kg.
Doing so may cause the scanner to malfunction or the Platen Glass to break.
Note
The machine cannot scan the area within approximately 0.04 inches / 1 mm of the front and
right edges of the Platen Glass.
You can also scan originals that are up to 0.79 inches / 20 mm thick, such as books. Set them
on the Platen Glass in the same way as paper documents.
2
Gently close the Document Cover.
6 Before Using the Machine