Ricoh FT4227 Manual page 584

12 February 1992
2.4 VERTICAL BLACK BANDS
- Phenomenon -
Vertical black bands appear on the copy.
- Possible Causes -
1. Dirty optics
2. Dust between the cleaning blade and drum
3. Edge of the cleaning blade deformed
4. Deformed cleaning brush
5. Deformed inlet seal on the development unit
- Action -
Do the black bands shift when a reduction copy is made?
No Yes
Check and clean the optics section (including the toner shield glass).
Press the blade release lever several times to clean the edge of the clean-
ing blade. If black bands still appear, go to the next step.
Is the edge of the cleaning blade deformed?
No Yes
Replace the cleaning blade.
Is the cleaning brush deformed?
No Yes
Replace the cleaning brush.
If the inlet seal on the development unit is deformed, replace the inlet seal
plate and the seal as a set.
6-9
COPY QUALITY