43XC-026
Yellow does not appear yellow
The residue of other colors of toner has accumulated on the intermediate transfer belt. Check the solutions below.
Remedy
This phenomenon may occur if the toner does not fully fix to the paper you are using.
To improve this situation, adjust the value for <Adjust Secondary 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 Secondary Transfer Voltage> → adjust the voltage value 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 Secondary Transfer Voltage> → adjust the voltage value toward the minus end.
"Paper Type Management" > "Adjusting the Secondary Transfer Voltage" in the User's GuideTo improve this situation, adjust the value for <Adjust ITB Image Clearing> 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 ITB Image Clearing> → adjust the image clear level to increase the precision of automatic cleaning of the intermediate transfer belt.
→ [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 ITB Image Clearing> → adjust the image clear level to increase the precision of automatic cleaning of the intermediate transfer belt. "Paper Type Management" > "Adjusting the Image Clear Level of the ITB (Intermediate Transfer Belt)" in the User's Guide