taskalfa 3500i

[Gab]

Occasionally dark lines ,like those in the attached file, appear at the copy. Especially in the morning
i cleaned machine and replaced charge roller with no result.
Toner is katun but never had that problem in other machines.
Any idea?

[rapo_tech]

This is caused most certainly by charge roller.

Did you replace with new charge roller?

Did you run U930 after replacement?

-e- it might be faulty developer also...
defects.jpg

As the difference between magnet roller and charge roller is 1mm, I think you can´t precisely measure it.
Try different developer.

[Ropariva]

Occasionally dark lines ,like those in the attached file, appear at the copy. Especially in the morning
i cleaned machine and replaced charge roller with no result.
Toner is katun but never had that problem in other machines.
Any idea?

Concur. If the repeat is @38mm intervals the. It is charge roller. Try cleaning it. They aren’t great with genuine toner, and will definitely have issues with non genuine.