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Laser printer print defects - Vertical black lines

ProblemPossible CauseSolution
Vertical black lines Defective toner cartridge Very common -- Install another toner cartridge or perform a halfway test to isolate the problem. Replace toner cartridge if necessary.
Vertical black lines Worn , failing fuser film Somewhat common -- Perform a halfway test to isolate the problem. Check fuser film for tearing or wear.  Replace the fuser if necessary.
Vertical black lines Defective formatter generating a "video line" Less common -- Replace formatter if necessary
Vertical black lines Faulty DC controller or high voltage power supply Less common -- Replace DC controller , high voltage if necessary