4WK8-027
If colors that have the same hue but have different brightness are adjacent to each other, the boundary between light areas and dark areas appears white. This is because the toner does not fix to the paper
The machine cannot develop the images correctly at the border of two areas due to the deterioration of the developers. Adjust the voltage for the image development in [Correct White Gap].
← Feeding Direction
Remedy
To improve this situation, adjust the voltage for the image development in [Correct White Gap].
Press 
→ [Adjustment/Maintenance] → [Adjust Image Quality] → [Correct White Gap] → change the setting value to [1] or [2].
→ [Adjustment/Maintenance] → [Adjust Image Quality] → [Correct White Gap] → change the setting value to [1] or [2].
"Adjustment for Image Quality and Finishing (Calibration)" > "Adjust Image Quality" > "White Gap Correction" in the User's Guide