The Copy Is Blurred And Fuzzy - Canon NP6251 Service Manual

CHAPTER 11 TROUBLESHOOTING

18. The copy is blurred and fuzzy.

Cause Step
Scanner drive 1
cable
Scanner rail 2
Photosensitive 3
drum
Drum drive 4
gear
Developing 5
gear
Cleaner 6
assembly gear
Drum drive
system
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Checks
Is the cable overlapping on the
cable pulley while the scanner is
moving, or is the cable too slack
or taut?
Move the No. 1 mirror mount by
hand. Does it move smoothly?
Does the problem occur at
intervals of about 25 cm?
Does the problem occur at
intervals of about 3 mm?
Does the problem occur at
intervals of about 6 mm?
Does the problem occur at
intervals of about 6 mm?
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
YES/NO Action
YES 1. Route the cable once
again.
2. If cable is twisted or
frayed, replace it.
NO Clean the surface of the
scanner rail with alcohol.
Thereafter, apply a small
amount of lubricant.
YES 1. Check the drum gear.
2. Check the ends of the
drum (in contact with
the developing rolls)
for scraches and
protrusions.
YES Check the drum drive
gear.
YES Check the developing
assembly.
YES Check the cleaner
assembly.
NO Check the drum drive
system.