Jitter in the sub scan direction for C6500

[tonyligz]

Hello guys:
How to do solution jitter in the sub scan direction only black for C6500 /C5500 printing test chart 53#?

[Livebychance]

How far apart are the jitter lines?

[random]

check your service manual and turn on Thick BK mode.

[tonyligz]

about 189mm or abnormity ,select A3 plain 80G . other colors is no problem.sure is not drum broken,but ......