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To identify the affected color, print three full-page, solid-fill A3 or DLT sheets for each of cyan, yellow, magenta, and black.
Check whether the problem occurs at the front or back of the paper.
<If the problem affects single color at the front of the paper>
Proceed to the solutions in Vertical Black (color) Streaks (1).
<If the problem affects multiple colors at the front of the paper>
If the problem persists even if you replace the ITB cleaning unit, contact your service representative.
<If the problem occurs at the back of the paper>
Replace the paper transfer unit. If the problem persists, contact your service representative.
For details about replacing the paper transfer unit or ITB cleaning unit, see Replacement Guide.
After performing the solution, it is recommended to perform the color calibration of the external controller.
