Cause:
The electricity charge for the black toner is lower than that for other colors, so the color may become
faint when transferred to paper.
In addition, the paper transfer bias in full color mode is higher than in black-and-white mode, so the
transferability of the low-charged black toner is prone to be low. Especially if text strings in the main
scanning direction are near black solid-fill areas, the areas using only black along the text strings may
become faint.
• The same problem may occur after the position is switched to the K and S toner positions, whereby
the special color (S) toner is in the black toner's position. The solutions are the same except that "(d)
Print black using 4C (CMYK)." is not applicable.
Solution:
(a) Adjust the image transfer output.
1. If the paper is not registered as custom paper, register the brand of the paper.
2. In [Detailed settings] for the custom paper you are using, select 1212: [Image Transfer
Output], Increase the value in the following corresponding settings by 1.
• 1212-01: Image Transfer Output: BW: Black
• 1212-02: Image Transfer Output: FC/FCS: Black
3. Print the image. Has the problem been resolved?
Yes Finished!
No Go to the next step.
4. Image Quality Problem: Full Page
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