DIAGNOSIS The ADF pickup or separation rollers are worn out or glazed with paper dust, losing their grip and causing misfeeds.
FIX Clean the ADF rollers with isopropyl alcohol.
- Open the document feeder cover. You'll see a set of white rubber rollers.
- Dampen a lint-free cloth with a little isopropyl alcohol (90%+).
- Manually rotate the rollers by hand while wiping their surface to remove all shine and dust buildup.
- Let dry completely for 2 minutes before testing with a standard sheet of plain paper.
IF THAT DIDN'T WORK The rollers are beyond cleaning and need replacement. The pickup roller assembly (Canon part RM2-7550-000) is a user-replaceable part you can order and install yourself.
HEADS UP The ADF is designed for standard 20-24 lb. paper. Heavier cardstock, already-crumpled sheets, or paper with staples/paperclips will cause immediate jams and damage the rollers.