Your is an "ATC error" indicating that the density test has failed for Black. There are many possibilities, but here are the top 5:
1) Dirty or defective ATC sensor (130K63000) (difficult to reach..recommended to be done by technician)
2) Defective Developer (802k60194) (also difficult) You also need Developer Charge Powder (604K22550)
3) Defective ATC Clutch (121K23270) (also difficult to reach)
4) Drum (013R00624) not turning, or bad drum
5) Drum motor (007K88604) not turning
xerox and tektronix dell canon konica minolta qms samsung lexmark okidata...
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