d-Color MF4003/MF3303
L TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
L-148
Step
Section
Check item
Result
Action
3
Service Mode ->
Gradation Adjust
Select [Service Mode] -> [Imaging Process Adjustment] -
> [Gradation Adjust] and the image trouble is eliminated.
NO
Go to the next step.
4
Image check
• Select [Service Mode] -> [Test Mode] -> [Halftone
Pattern].
Select "SINGLE", "HYPER", "Error diffusion", "1-
Sided", "CMYK", and "Full Bleed", enter "64" for
Density, and load tray 2 with A4 paper. Press the
start key. This runs a print cycle for C, M, Y, and K
in that order.
• Check the image after printing and the abnormal
image occurs only with one color.
YES
Go to the 1-color troubleshooting
procedure.
NO
Go to the 4-color troubleshooting
procedure.
1-color troubleshooting procedure
Step
Section
Check item for the faulty color
Result
Action for the faulty color
1
Uneven pitch at 94 mm
interval
Dirt, scratches, or foreign matter on the photoconductor.
YES
• Clean.
•
2
Uneven pitch at 50 mm
interval
Dirt, scratches, or foreign matter on the developing
roller.
YES
• Clean.
•
3
Write section
Dirt or foreign matter on the dust-proof glass of the PH.
YES
4
Charging section
Foreign matter on charging roller.
YES
Lightly wipe the surface clean of
foreign matter using hydro-wipe
(65AA-99##).
Note: Do not apply a strong force
to the surface of the charging
roller, as doing so can damage the
surface.
5
Connector connection
Faulty connector connection the high voltage unit (CN1)
and base board (CN4E).
YES
Reconnect the connector.
NO
•
Replace the high voltage unit.
•
4-color troubleshooting procedure
Step
Section
Check item
Result
Action
1
Uneven pitch
Dirt, scratches, or foreign matter on the transfer belt.
YES
• Clean.
•
Replace the transfer belt unit.
2
Uneven pitch at 59 mm
interval
Dirt or foreign matter on the 2nd transfer roller.
YES
• Remove the foreign matter.
•
Replace the transfer roller
unit.
3
Uneven pitch at 259 mm
interval
Dirt, scratches, or foreign matter on the fusing belt.
YES
• Clean.
•
4
Uneven pitch at 100 mm
interval
Dirt, scratches, or foreign matter on the fusing pressure
roller.
YES
• Clean.
•
5
Paper path
There is dirty or foreign matter on paper path.
YES
Check or clean the paper path
including the duplex section.
NO
•
Replace the transfer belt unit.
•
Replace the high voltage unit.
•
16.3.17 Uneven gloss, Rough gloss
Typical faulty images
The arrow in the exemplary image troubles indicates the paper feeding direction.
Troubleshooting procedure
Step
Section
Check item
Result
Action
1
Paper Setting
The paper to be used for printing does not match the
paper type and size of paper setting selected on the
machine.
YES
Make the paper setting again on
the machine.
2
Image check
• Select [Service Mode] -> [Test Mode] -> [Halftone
Pattern].
Select "SINGLE", "HYPER", "Error diffusion", "1-
YES
Go to the next step.
Service Manual
Y119930-3
Summary of Contents for d-Color MF 4003
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