Canon imagePROGRAF iPF6100 User Manual page 691

If paper is jammed deep in the Paper Feed Slot, remove the Roll Feed Unit and clear the paper jam as follows.
1.
Turn off the printer and remove the Roll Feed Unit from the printer. (→P.147)
2.
Remove the jammed paper from the Paper Feed Slot.
After removing the paper, make sure there are no other scraps of paper in the printer.
3.
Install the Roll Feed Unit on the printer again. (→P.148)
Clearing jammed paper
Troubleshooting 677