Black Streaks (Lines), Smudge Marks, Or White Points Appear - Canon LBP7018C E-Manual

Black Streaks (Lines), Smudge Marks, or White Points Appear

019A-081
Perform the following procedure.
<Cause> Black streaks (lines), smudge marks, or white points may appear on the images
depending on the operating environment (especially in a high-humidity or low-temperature
environment).
Clean the photosensitive drum of the printer.
Solution
"Cleaning the Photosensitive Drum of the Printer"