The Print Is Too Light (Including Solid Black Area); The Print Is Too Light (Overall, Appreciably) - Canon Image Reader-A1 iR5000i Service Manual

CHAPTER 4 TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS

3.2 The print is too light (including solid black area)

3.3 The print is too light (overall, appreciably)

1) Turn off the main power switch in the middle of printing. At this time, is
the toner image on the surface of the photosensitive drum (before transfer)
more or less normal?
YES: The cause is in a process that follows transfer. Go to step 3).
Developing assembly
2) Are the rolls of the developing assembly in firm contact with the photo-
sensitive drum?
NO:
YES: Check the control system of the developing bias.
Pre-transfer charging assembly
3) Is the pre-transfer charging assembly fitted securely?
NO:
Transfer faults
4) Is the transfer/separation charging assembly fitted securely?
NO:
5) Try changing the setting of the following in service mode between '1'
and '3': COPIER>OPTION>BODY>FUZZY. Is the problem corrected?
YES: End. (The problem is due to the environment.)
NO:
6) Measure the resistance between the transfer guide and the base (metal)
with a meter. Is it 0Ω?
YES: Check to find out if the transfer guide is in contact with a metal
NO:
4-6 T
Check to see if the developing assembly locking unit is mounted
correctly.
Fit the charging assembly securely.
Fit the transfer/separation charging assembly securely.
Set '0' to 'FUZZY', and go to the next step.
area (e.g., side plate of the feeding assembly).
Check the high-voltage transformer (HVT) and the DC controller
PCB.
COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON iR5000i/iR6000i REV.0 JUNE 2001