> When Images like These Are Output > Streaks Appear in Your Printouts > Streaks that are parallel to the direction of feed appear in the printout
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Streaks that are parallel to the direction of feed appear in the printout

The corona assembly wires inside the main unit are dirty. Clean the wires.
← Feeding Direction
Remedy
Clean the corona assembly wires inside the main unit several times.
Press  → <Adjustment/Maintenance> → <Maintenance> → <Clean Wire>.
 "Settings/Registration" > "<Adjustment/Maintenance>" > "<Maintenance>" in the User's Guide > see the subsection "<Clean Wire>"