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Vertical black line

Vertical black line and band — Printing quality issue

Samsung · Laser Printers

What does Vertical black line mean?

Printed pages show vertical black lines or bands. This indicates a problem with the toner cartridge, the Laser Scanning Unit (LSU), or the drum unit.

Common Causes

  • Toner cartridge blade is faulty or damaged
  • LSU (Laser Scanning Unit) malfunction
  • Drum cartridge cleaning blade is faulty

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Replace the toner cartridge with a new one.

  2. 2

    Ensure the drum cartridge is properly installed and clean.

  3. 3

    If the problem persists, the drum cartridge may need to be replaced.

Browse all codes in this manual (57)
Verified technical data. Last updated: April 2026

Related Faults

Abnormal PrintingAbnormal printing — Strange characters or no outputAbnormal noise (scanner)Abnormal noise — Scanner making unusual soundsCover openCover open — Printer indicates a cover is not closed
Source: Samsung Laser Printers
Open Manual (Page 117)Search more codes in this manual