Canon NP6251 Service Manual page 601

CHAPTER 11 TROUBLESHOOTING
2. The copy is too light (including solid black).
3. The copy is too light (entire face).
Cause Step
Transfer/
separation
charging
assembly
Copy paper
11-70
COPYRIGHT © 1997 CANON INC.
Checks
1 Perform the Image Adjustment
Basic Procedure. Is the problem
corrected?
2 Turn off the power switch during
copying, and open the front door.
Is the toner image on the surface
of the photosensitive drum before
transfer more or less normal?
3 Is the charging wire of the transfer
charging assembly hooked
correctly and is its height correct?
4 Is the transfer/separation
assembly set securely?
5 Set 'FUZZY' in service mode (
) to '1', and make a copy. Is
5
the problem corrected?
Try fresh copy paper. Is the
6 problem corrected?
YES/NO
YES
NO
NO
NO
YES
NO
YES
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action
End.
Go to step 7.
1. Hook the charging
wire correctly.
2. Adjust the height of
the charging wire.
1. Clean the charging
wire.
2. Set the charging
assembly securely.
End. (The problem is
due to the environment.)
Set 'FUZZY' back to '0',
and perform the
following steps.
1. The paper may be
moist. Advise the user
on the correct method
of storing paper.
2. Advise the user that
the use of paper not
recommended by
Canon may not bring
the best results.
Cont'd