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