Canon MF5880dn

Light print

Image is light in entire page

Cause	Solution
1) Print density is not adjusted properly	Adjust the print density by operating the external device.
Open the cartridge door during a print operation and remove the cartridge. Open the photosensitive drum shield of the cartridge to check the toner image on the drum surface. If the toner image is not fully transferred to the media, go to step 2. If the toner on the photosensitive drum is faint, go to step 5. Do not open the drum shied for longer than 10 seconds.
2) The transfer roller is deformed or has deteriorated	Replace the transfer roller.
3) Poor contact exists between the transfer roller and its shaft	Clean the contact if dirty.
4) The high-voltage power supply is defective	Replace the engine controller unit.
5) The laser scanner unit is defective	Replace the laser scanner unit.

Dark print

Image is obviously dark

Cause	Solution
1) Print density is not adjusted properly	Adjust the print density by operating the external device.
2) Poor drum grounding contact with the cartridge	Clean a contact point of the Cartridge. Clean a contact point of the main body. Replace the Cartridge.
3) Poor primary charging bias contact with the cartridge	Clean the contact if dirty.
4) The high-voltage power supply is defective	Replace the engine controller unit.
5) The laser scanner unit is defective	Replace the laser scanner unit.
6) The high-voltage power supply is defective	Replace the engine controller unit.