The Copy Is Too Light; The Copy Is Too Light. (Entire Copy, Considerably) - Canon NP6330 Service Manual

CHAPTER 11 TROUBLESHOOTING
2 The copy is too light. (solid black also)
3

The copy is too light. (entire copy, considerably)

Step
Cause
1
2
Transfer
3
charging
assembly
4
Copy paper
5
Lower transfer
6
guide
Developing
7
assembly
8
Toner level
9
detecting
mechanism
11-58
Checks
Perform the Image Adjustment
Basic Procedure. Is the problem
corrected?
Turn off the power switch in the
middle of copying, and open the
front door. At this time, is the toner
image on the surface of the
photosensitive drum before
transfer more or less normal?
Is the transfer charging assembly
set securely?
Is the charging wire of the transfer
charging assembly hooked
properly, and is its height normal?
Try fresh copy paper. Is the
problem corrected?
Set the feeding assembly, and
measure the resistance between
the lower transfer guide and the
base (metal portion) of the trans-
fer charging assembly. Is it 0
Is the developing assembly set
securely? (Are the rolls of the
developing assembly in firm con-
tact with the photosensitive
drum?)
Execute idle rotation of the devel-
oping assembly in service mode
[4]. Is the problem corrected?
Is toner present inside the
developing assembly?
COPYRIGHT © 1997 CANON INC.
YES/NO
YES
NO
NO
NO
YES
NO
?
NO
YES
NO
CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action
End.
Go to step 6.
Set the charging
assembly securely.
Re-string the charging
wire.
1. The paper may be
moist; advise the
user on the correct
method of storage.
2. Advise the user that
the use of paper not
recommended by
Canon may not bring
about the best
results.
Check to make sure that
the lower transfer guide
is not in contact with a
metal portion (like the
side plate of the feeding
assembly).
Re-set the developing
assembly.
End.
See "The Add Toner
indicator fails to turn off."