Canon NP6218 The copy is foggy vertical, The copy has black lines vertical thick fuzzy lines

CHAPTER 10 TROUBLESHOOTING

7.The copy is foggy (vertical).

8.The copy has black lines (vertical; thick fuzzy lines).

Cause	Step	Checks	Results	Action
	1	Perform the Image Adjustment	YES	End.
		Basic Procedure. Is the problem
		corrected?
Primary	2	Execute ‘No. 402’ in service mode	YES	End.
charging roller		(primary charging roller cleaning).
		Is the problem corrected?
Scanner	3	Clean the scanning lamp, reflect-	YES	End.
		ing plate, side reflecting plate,
		lens, mirror, and dust-proofing
		glass. Is the problem corrected?
Pre-exposure	4	Clean the pre-exposure lamp. Is	YES	End.
lamp		the problem corrected?
Developing	5	Is the developing cylinder coated	NO	Replace the developing
assembly		with a uniform layer of toner?		assembly.
Fixing			YES	Check and clean the
assembly				fixing assembly.

9. The copy has black lines (vertical, fine).

Cause

Step	Checks	Results	Action
1 Make a copy, and turn off the		NO	Go to step 3.

power switch while the paper is in the feeding assembly. Are black lines noted on the copy before it moves through the fixing assembly?

Transfer guide

Photosensitive drum

Exposure system

Fixing assembly

2Is the transfer guide soiled (in par- ticular, the upper transfer guide) ?

3Are scratches or black lines noted around the photosensitive drum? Try wiping the photosensitive drum with a flannel cloth coated with toner. Do the lines disap pear?

Are there scratches or black lines

4on the upper fixing film?

YES	End.
YES	Replace the drum
	cartridge. If scratches
	are found, investigate
	the cause.
NO	Check the exposure
	system.
YES	Replace the upper fixing
	unit.
NO	Check the inlet of the
	fixing assembly for dirt.

10-54 COPYRIGHT © 1997 CANON INC. CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)