Canon LBP-860 Service Manual page 170

CHAPTER 6
Lark of toner
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Check
Is there one or more straight vertical
white streaks of uniform width?
Open the protective shield of the
cartridge. Are vertical white streaks
on the drum surface?
Is paper dust adhering to the reflection
mirror in the laser/scanner unit7
Is any fore@ matter, such as a hair.
adhering Lo the laser outlet of the
Result Procedure
Take out the cartridge, rock
it as shown in Section III of
Chapter 4 to distribute the
toner evenly. then put it
back.
YES Replace the cartridge.
YES Replace the laser/scanner
unit.
Remove the foreign matter.
Replace the laser/scanner
unit.