When the laser unit inside the machine becomes dirty, line patterns (colored lines) may form in the printed image. If line patterns (colored lines) appear, clean the laser unit.
Identifying lines (colored lines) caused by a dirty laser unit
- Colored lines always appear in the same place. (The lines are never black.)
- Colored lines appear in parallel with the direction of paper feeding.
- Colored lines appear not only on output from a copier but also on prints from a computer. (The same lines appear on both copies and print jobs.)