Ricoh FW830 Service Manual page 213

TROUBLESHOOTING FOR COPY IMAGE
1.2.2 Partial Dirty Background
Does the dirty background area change position at each copy cycle?
Yes No
Is image density of solid areas high?
Yes No
Cleaning function may not work properly.
⇒ Check and fix the cleaning unit.
Toner density in the development unit may be too high.
⇒ Change ID sensor bias position 0 to 1.
Does the dirty background area move if you reverse the ends of the drum?
Yes No
Drum sensitivity may not be even.
⇒ Replace the drum.
Light intensity may not be even.
⇒ Clean the optics and/or replace the fluorescent lamp.
Dirty optics or foreign material may obstruct the light path.
⇒ Clean optics and check the light path.
6-4
31 December 1992