The Copy Is Too Light (Solid Black Area); The Copy Is Too Light (Entire Face, Considerable) - Canon iR8500 Service Manual

CHAPTER 6 TROUBLESHOOTING

3.3.2 The copy is too light (solid black area)

3.3.3 The copy is too light (entire face, considerable)

Paper
1) Try fresh paper. Is the problem corrected?
YES: 1. The paper may be moist. Advise the user on the correct method
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2) Perform the Image Adjustment Basic Procedure. Is the problem
YES: End.
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3) Turn off the power switch it the middle of copying operation, and
NO:
Transfer
4) Is the transfer/separation charging assembly securely fitted?
NO:
5) Vary the setting of the following service mode between '1' and '3' to
YES: End (The problem is caused by the environment).
NO:
Transfer
Transfer guide
6) Measure the resistance between the transfer guide and the feeding
YES: Check to find out if the transfer guide is in contact with a metal
DC controller PCB
NO:
Development
Developing assembly (position)
7) Is the developing assembly fitted securely? Are the developing
NO:
6-78
of storing paper.
2. Advise the user that the use of non-recommended paper can
bring about poor results.
corrected?
open the front cover. At this time, is the toner image on the photo-
sensitive drum (before transfer) more or less normal?
The cause is before transfer. Go to step 8).
Fit the charging assembly securely.
suit the environment, and make prints:
COPIER>OPTION>BODY>FUZZY. Is the problem corrected?
Set 'FUZZY' to '0', and make the checks that follow.
assembly (metal portion) with a meter. Is it 0 Ω Ω Ω Ω Ω ?
area (e.g., side plate of the feeding assembly).
Check the high-voltage transformer (HVT) and the DC controller
PCB.
members of the developing assembly in firm contact with the photo-
sensitive drum?
Check how the developing assembly locking plate is mounted.
COPYRIGHT© 2001 CANON INC. 2000 2000 2000 2000 CANON iR8500/7200 REV.1 AUG. 2001