Vertical Black (color) Streaks (2)
Extended, blurred black (color) streaks parallel to the paper feed direction appear. The streaks also
appear randomly in the margins.
Cause:
If the temperature or humidity is low, remaining toner might be missed by the cleaning blade of the ITB
cleaning unit or paper transfer unit, causing streaks to appear sporadically.
Solution:
1. To identify the affected color, print three full-page, solid-fill A3 or DLT sheets for each of
cyan, yellow, magenta, and black.
2. 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 page 50 "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.
5. Image Quality Problem: Lines
52
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