Canon imageRUNNER C3489 Reference Manual page 339

6
Change the paper drawer's size sticker to match the new
paper size.
7
Gently push the paper drawer back into the machine until it
clicks into place in the closed position.
CAUTION
When returning the paper drawer to its original position, be careful not to
get your fingers caught, as this may result in personal injury.
Size Sticker
Paper Drawers
7
7-9