If you referring to color copier this means you having black drum or black dv unit error.
you can try to reset it by entering the maintenance mode and reset the disable function sometimes it works.
login to maintenance mode:
1087 1087
Start
906
Start
Highlight Execute
Start.
Turn machine OFF/ ON
Good Luck!
I’m happy to help further over the phone at https://www.6ya.com/expert/mustafa_06f84c65ab5cc745
Kyocera Printer machine failure C7101
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