Canon i-SENSYS MF5840dn

Dirt on front

The front 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 (MP tray pickup roller)	Clean the MP tray pickup roller. If the dirt does not come off, replace the roller.
3) Repetitive dirt (Registration roller, fixing film unit or cartridge)	See "Repetitive image defects ruler" to identify the dirty roller. Clean the dirty part. If the dirt does not come off, replace the part.
4) The delivery roller is dirty	Clean the delivery roller.

Dropouts

Dropout appears in image

Cause	Solution
1) The transfer roller is dirty or deformed	Replace the transfer roller
2) Poor toner sensor contact with the cartridge	Clean the contact if dirty.
3) The photosensitive drum, primary charging roller, developing roller or toner sensor is defective	Replace the cartridge.
4) Scratches or foreign substance on the fixing film	Replace the fixing unit.
5) The high-voltage power supply is defective	Replace the engine controller unit.

Vertical white lines

Vertical white line appears in image

Cause	Solution
1) Scratches on the circumference of the photosensitive drum	Replace the cartridge.
2) The developing roller is defective	Replace the cartridge.
3) Foreign substance adheres to the laser beam window of the printer or cartridge	Remove foreign substance from the laser beam window.
4) Foreign substance adheres to the fixing inlet guide or the guide is dirty	Clean the fixing inlet guide.
5) Scratches or foreign substance on the fixing film	Replace the fixing unit.
6) The mirror in the laser scanner unit is dirty	Replace the laser scanner unit.