Specifications

1.4 VERTICAL BLACK BANDS
- Phenomenon -
Vertical black bands appear on the copy paper.
- 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 down two or three times to clean the edge of
the the cleaning blade. If the 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.
1 December 1990
6-8