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Laser printer print defects - Vertical white lines

ProblemPossible CauseSolution
Vertical white lines Failing toner cartridge Very common -- Try gently shaking the cartridge to redistribute the toner. If the problem continues, replace the toner cartridge.
Vertical white lines Contamination in the laser path Somewhat common -- 1. Clean the laser scanner mirrors and lens. 2. Replace the laser / scanner assembly.