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2. The copy is too light (black solid also).
3. The copy is too light (overall, extremely).
COPYRIGHT
©
1997 CANON INC. CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
10-50
CHAPTER 10 TROUBLESHOOTING
Checks
Perform the Image Basic
Adjustment Procedure. Is the
problem corrected?
Turn off the power switch during
copying operation, and open the
front door. Is the toner image on
the photosensitive drum before
transfer more or less normal?
Is the transfer charging roller
securely inserted?
Is electrical leakage noted on the
transfer charging roller?
Is dirt, crack, or scratch noted on
the transfer charging roller?
Are the position and condition of
the pressure spring of the transfer
charging roller normal?
Try fresh copy paper. Is the
problem corrected?
Set the feeding assembly in
feeding position, and measure the
resistance between the lower
transfer guide and the base
(metal) of the transfer charging
assembly rail. Is the resistance 0
Ω?
Cause
Transfer
charging
roller
Copy paper
Lower trans-
fer guide
High-voltage
cord, high-
voltage
transformer,
DC con-
troller PCB
Step
1
2
3
4
5
6
7
8
Results
YES
NO
NO
YES
YES
NO
YES
NO
Action
End.
Go to step 7.
Re-insert the transfer
charging roller.
Check the transfer
charging roller.
Replace the transfer
charging roller.
Correct or replace the
spring.
1. The paper may be
moist; advise the
user on the correct
way of storing paper
2. Advise the user that
the use of paper not
of a type
recommended by
Canon may produce
images falling short
of expectations.
Check if the lower
transfer guide is in
contact with a metal
portion (e.g., side plate
of the feeding assembly).
1. Check the electrical
continuity of the high-
voltage cord.
2. Check the high-
voltage transformer
and the DC controller
PCB.
Transfer