Ricoh FW830 Service Manual page 215

TROUBLESHOOTING FOR COPY IMAGE
1.2.4 Dirty Background Lines
Vertical lines?
Yes No
Horizontals?
Yes No
The fusing rollers may be dirty if lines appear only at the copy leading edge.
⇒ Clean and/or replace the fusing rollers.
Drum scratch if lines appear 251 mm interval.
⇒ Clean and replace the drum if necessary.
Do the lines appear when a plain white original is copied?
Yes No
Drum scratch.
⇒ Adjust light intensity. Replace the drum if lines are still visible.
Dirty exposure glass or cleaning blade damage.
⇒ Clean the exposure glass or replace the cleaning blade.
1.2.5 Random Dirty Background
Light dirty background?
Yes No
Toner may be falling from the cleaning unit or pick-off pawls.
⇒ Check and fix cleaning unit and pick-off pawls.
Is image density of solid areas high?
Yes No
Unknown.
⇒ Check around the drum.
Toner density in the development unit may be too high.
⇒ Change ID sensor bias position from 0 to 1.
6-6
31 December 1992