K density faded c550/650

[Synaux]

Glad you got it sorted tbu is, transfer belt unit.

Oh lol

[GTgosu]

i have the same problem so Synaux i try to
replace:
transfer belt
HV board 1/2
Toner supply section
Developer in IU
Drum in IU

after that i bought a new IU, after 2k copies problem returned.
I don't have any idea how to fix this.