Canon MF5840dn

Dirt on back

The back of page is dirty

Cause	Solution
1) The print media is dirty	Replace the print media to new one. Advice the customer on how to store the print media.
2) Dirt on leading edge of image (cassette pickup roller)	Clean the cassette pickup roller. If the dirt does not come off, replace the roller.
3) Repetitive dirt (registration roller, transfer roller or pressure roller)	See "Repetitive image defects ruler" to identify the dirty roller. Clean the dirty roller. If the dirt does not come off, replace the roller.
4) The media feed belt, media feed guide or fixing inlet guide is dirty	Clean the dirty parts.

Vertical lines

Vertical line appears in image

Cause	Solution
1) Scratches on the circumference of the photosensitive drum	Replace the cartridge.
2) The fixing inlet guide is dirty	Clean the fixing inlet guide.
3) Scratches on the fixing film	Replace the fixing unit.

Horizontal lines

Horizontal line appears in image

Cause	Solution
1) Horizontal scratches on the photosensitive drum	Replace the cartridge.
2) The fixing film is dirty, deformed or worn	Replace the fixing unit.
3) Scratches/stain on the Secondary Transfer Roller	Replace the Cartridge.