A 3235 c yellow zone

[Guest]

Hi all,
In copy direction I have yellow line about 5cm at the bottom. This problem appeare usualy after larger job.
Drum is NOT a problem! My first step was change it but NO result.
See attachment.

[Eric1968]

Is this a copy or a printout? If it's a copy then dirty optics can be the cause.

[bostjanma]

Printout! Optic is ok.