1.2 DIRTY BACKGROUND
- Problem -
1. Dirty background at image density level 4 (manual setting).
2. When newspapers are copied, the background is dirty even at level 7.
3. ADS copies have a dirty background.
- Possible Causes -
1. Dirty optics
2. Toner scattering
•
High toner density
•
The inlet seal of the development unit is stripped off.
•
User/SP mode setting error
3. The exposure lamp is not bright enough. This may be caused by
deterioration of the exposure lamp or low lamp voltage.
4. In ADS mode, light reflected from the original is too intense.
5. The ADS optical fiber is cut or bent.
6. The development bias is grounded.
- Action -
Make a copy in reduction mode at manual image density level 4.
Is the non-image area dirty?
Yes No
Are the optics dirty?
No Yes
Clean the optics and perform the necessary SP modes
in order (see Section 4 - Service Remarks for details).
Trouble-
shooting
20 December 1996 COPY QUALITY
7-3
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