Canon BJC-6200 - Manual (Page 199)

199 Troubleshooting - Paper Jams or Does Not Feed
Paper does not feed from auto sheet feeder
After the print job is started, the paper loaded in the auto sheet feeder does not feed.
Check 1 Is the paper too thick?
Check 2 Is the sheet feeder overloaded?
Check 3 Did you raise the paper rest?
Check 4 Is the paper folded or curled?