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

Copy paper
1) Try fresh copy 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 offf 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:
6-80
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 copies:
COPIER>OPTION>BODY>FUZZY. Is the problem corrected?
Set 'FUZZY' to '1', 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 REV.0 MAR. 2001