Check the counter of PM parts around the drum (photoconductor unit). Replace PM parts whose counter has exceeded its PM life.
Register the problem paper brand in the “Custom Paper Settings” if it is not registered.
Subtract “1” from the current setting of “Custom Paper Settings – 21: Adjust Toner Adhesion (Special)” (Minimum value: -5).
Print the problem image.
Is the printed image acceptable?
Yes: Finish.
No: Go to step 3. (Repeat until the setting value becomes “-5”.)
After taking the above measures, do the color calibration adjustment of the external controller.