The Copy Has Vertical Fogging; The Copy Has Black Lines (Vertical, Fuzzy, Thick) - Canon NP6251 Service Manual

CHAPTER 11 TROUBLESHOOTING

7. The copy has vertical fogging.

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

Cause Step
Primary 1
charging
assembly
Scanner system 2
Pre-exposure 3
lamp
Developing 4
assembly
Fixing assem-
bly, Cleaner
assembly
11-74
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Checks
Clean the charging wire, grid wire,
and shielding plate. Is the problem
corrected?
Clean the scanning lamp,
reflecting plate, side reflecting
plate, lens, mirror, dust-proofing
glass, and heat absorbing glass.
Is the problem corrected?
Clean the pre-exposure lamp. Is
the problem corrected?
Is the developing cylinder coated
with an even layer of toner?
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
YES/NO Action
YES End.
YES End.
YES End.
NO Check and clean the
edge of the blade of the
developing assembly.
YES Check the fixing
assembly and the
cleaner assembly.