12. The copy has white spots (horizontal).COPYRIGHT © 1997 CANON INC. CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)10-56CHAPTER 10 TROUBLESHOOTINGChecksTake out the developing assembly,and shake it several times. Is theproblem corrected?Is the problem noted at intervalsof about 9.4 cm (scratches in thephotosensitive drum)?Is the problem noted at intervalsof about 5.1 cm?Execute ‘No. 402’ in service mode(primary charging roller cleaning).Is the problem corrected?Execute ‘No. 403’ (transfer rollercleaning) in service mode. Is theproblem corrected?Is the problem noted at intervalsof about 5.1 cm?Is dirt, cracks, or scratches notedon the transfer charging roller?Are the position and condition ofthe transfer charging rollerpressure spring normal?Try fresh copy. Is the problemcorrected?Is the problem noted at the samelocation on all copies?CauseToner levelPhotosensitivedrumPrimarycharging rollerTransfercharging rollerCopy paperScanner rail,scanner cableStep12345678910ResultsYESYESYESYESYESYESYESNOYESYESActionThe toner level may notbe adequate; advise theuser.1. Clean the drum.2. If scratches are foundon the drum, replacethe drum cartridge.Check the primarycharging roller forscratches and dirt.End.End.Check the transfercharging roller for dirtand scratches.Replace the transfercharging roller.Correct or replace thespring.The paper may be moist;advise the user on thecorrect method of storingpaper.1. Check the scannerrail for foreign matter.2. Adjust the tension ofthe scanner cable.
