Bizhub C451 black fades away like gradient effect

[konica7022]

i disassembled, cleaned and reassembled C451 black IU to get rid of the Ghosting effect

now it just fades like this(see attached image please)30081

[allan]

Did you drop toner inside the machine?

[konica7022]

Did you drop toner inside the machine?

off course not, but even if i did that wont cause the fading/gradient effect

i assume, the alignment between drum and blade is not even, i will tray reassembling again :(

what i dont under stand is why the print is so light even with density Level Full

mean while i bought a new after market blackIU and machine is working good(how long it will last that remains to be seen)