Canon LBP6030w Manual page 156

Are you using appropriate paper?
Check the usable paper types, and replace with appropriate paper.
Paper
Is it time to replace the toner cartridge?
Materials inside the toner cartridge may have deteriorated. Replace the toner cartridge.
How to Replace Toner Cartridges
Are you printing a document with strong contrasts between light and dark, and does the white appear around
text or edges in an image?
In the printer driver, set [Special Print Mode] to [Special Settings 2].
[Finishing] tab
Compared to the [Off] setting, the [Special Settings 2] setting selects lighter print density.
Black Spots Appear
Have you cleaned the fixing unit?
Clean the fixing unit.
Fixing Unit
Reverse Side of Paper is Smudged
Have you loaded paper that is smaller than the size of the print data?
Check to make sure that the paper size matches the size of the print data.
Printouts Are Grayish
Is the machine installed in a location where it is exposed to direct sunlight?
Move the machine to a location where it is not exposed to direct sunlight.
Relocating the Machine
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[Advanced Settings] [Special Print Mode] [Special Settings 2]