85CR-01F
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].
→ [Adjustment/Maintenance] → [Maintenance] → [Clean Wire].
"Settings/Registration" > "Adjustment/Maintenance" > "Maintenance" in the User's Guide > see the subsection "Clean Wire"