Ricoh FT4480 Field Service Manual page 220

I
Clean or replace the toner supply clutch.
• Check and adjust the charge corona current.
• Clean or replace the cleaning brush.
Clean the edge of the cleaning blade.
Check that the edge of the blade scraper is straight and that its
movement is smooth. If not, correct or replace any defective parts.
If the problem still exists, one of the following should solve it.
Replace the cleaning blade.
Check the quenching lamp; replace if necessary.
Replace the drum.
9-15
15 March 1987