Canon NP6251 Service Manual page 608

Cause Step
Transfer/ 6
separation
charging
assembly,
Pre-transfer
charging
assembly
Blanking 7
exposure lamp,
DC controller
PCB
External light
COPYRIGHT © 1997 CANON INC.
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Checks
Are the separation claws of the
cleaner assembly in contact with
copy paper while the copy paper
is being fed?
Are the blank exposure LEDs
(lamp) corresponding to the
problem in the copy image ON
while the scanner is moving
forward?
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 11 TROUBLESHOOTING
YES/NO Action
YES 1. Clean the pre-transfer
charging assembly
and the
transfer/separation
charging assembly. If
the dirt cannot be
removed, replace the
charging wire.
2. Try replacing the copy
paper.
3. Select 'FUZZY' in ser-
vice mode (
and set it to '3'.
YES Check the wiring from
the blanking exposure
lamp to the DC controller
PCB; if normal, replace
the DC controller PCB.
NO Check the
photosensitive drum to
see if it should not be
exposed to external light.
),
5
11-77