4WK8-022
A part of the image is faint, and fine streaks appear in the faint area
The primary voltage that transfers toner to the paper does not match the specific characteristics of the paper, or too much toner is being used. Check the solutions below.
← Feeding Direction
Remedy
To improve this situation, adjust the value for <Adjust Primary Transfer Voltage> to match the specific characteristics of the paper.
Press 
→ [Preferences] → [Paper Settings] → [Paper Type Management Settings] → select the type of paper you are using that is having this problem → press [Details/Edit] → [Change] for <Adjust Primary Transfer Voltage> → adjust the voltage value of black toward the minus end.
→ [Preferences] → [Paper Settings] → [Paper Type Management Settings] → select the type of paper you are using that is having this problem → press [Details/Edit] → [Change] for <Adjust Primary Transfer Voltage> → adjust the voltage value of black toward the minus end.
"Paper Type Management" > "Adjusting the Primary Transfer Voltage" in the User's GuideTo improve this situation, do an automatic gradation adjustment that adjusts the total amount of toner.
Press → [Adjustment/Maintenance] → [Adjust Image Quality] → [Auto Adjust Gradation].
→ [Adjustment/Maintenance] → [Adjust Image Quality] → [Auto Adjust Gradation]. "Adjustment for Image Quality and Finishing (Calibration)" > "Adjust Image Quality" > "Automatic Gradation Adjustment" in the User's Guide