Horizontal Black/White Lines - Ricoh FT5233 Service Manual

12 February 1992
2.8

HORIZONTAL BLACK/WHITE LINES

- Phenomenon -
Black or white lines perpendicular to the paper feed
direction appear on the copy image.
- Possible Causes -
1. Drum is scratched.
If black lines appear at 251 mm (9.89") intervals, the cause is a
scratched drum or toner build up.
2. Hot roller is scratched.
If black lines appear at 125.5 mm (4.94") intervals, the cause is a
scratched hot roller.
3. Toner adheres to the drum surface.
Due to insufficient cleaning, foreign matter may accumulate 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 wet cotton. Also
clean or replace the cleaning blade and/or cleaning brush.
6-13
COPY QUALITY