Canon NP6218, FY8-13EX-000 service manual Copy has white spots horizontal, 10-56

CHAPTER 10 TROUBLESHOOTING

12. The copy has white spots (horizontal).

Cause	Step	Checks	Results		Action
Toner level	1	Take out the developing assembly,	YES	The toner level may not
		and shake it several times. Is the		be adequate; advise the
		problem corrected?		user.
Photosensitive	2	Is the problem noted at intervals	YES	1.	Clean the drum.
drum		of about 9.4 cm (scratches in the		2.	If scratches are found
		photosensitive drum)?			on the drum, replace
					the drum cartridge.
Primary	3	Is the problem noted at intervals	YES	Check the primary
charging roller		of about 5.1 cm?		charging roller for
				scratches and dirt.
	4	Execute ‘No. 402’ in service mode	YES	End.
		(primary charging roller cleaning).
		Is the problem corrected?
Transfer	5	Execute ‘No. 403’ (transfer roller	YES	End.
charging roller		cleaning) in service mode. Is the
		problem corrected?
	6	Is the problem noted at intervals	YES	Check the transfer
		of about 5.1 cm?		charging roller for dirt
				and scratches.
	7	Is dirt, cracks, or scratches noted	YES	Replace the transfer
		on the transfer charging roller?		charging roller.
	8	Are the position and condition of	NO	Correct or replace the
		the transfer charging roller		spring.
		pressure spring normal?
Copy paper	9	Try fresh copy. Is the problem	YES	The paper may be moist;
		corrected?		advise the user on the
				correct method of storing
				paper.
Scanner rail,	10	Is the problem noted at the same	YES	1.	Check the scanner
scanner cable		location on all copies?			rail for foreign matter.
				2. Adjust the tension of
					the scanner cable.

10-56 COPYRIGHT © 1997 CANON INC. CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)