Specifications

1.8 HORIZONTAL BLACK/WHITE LINES
- Phenomenon -
Black/white lines perpendicular to the paper feed
direction appear on the copy image.
- Possible Causes -
1. Drum is scratched.
If black lines appear at 251mm intervals, the cause is a scratched drum or
toner build up.
2. Hot roller is scratched.
If black lines appear at 125mm intervals, the cause is a scratched hot
roller.
3. Toner adhered to the drum surface.
Due to insufficient cleaning, foreign matter may be build up on the blade,
causing toner to stick to the drum surface when the drum stops.
- Action -
Is the drum scratched?
No Yes
Replace the drum.
Is the hot roller scratched?
No Yes
Replace the hot roller.
If toner adheres to the drum surface, clean the drum with water. Also clean or
replace the cleaning blade and/or cleaning brush.
1 December 1990
6-12