d-Color MF4003/MF3303
L TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
L-135
Step
Section
Check item
Result
Action
4
Service Mode ->
Gradation Adjust
Select [Service Mode] -> [Imaging Process Adjustment] -
> [Gradation Adjust] and the image trouble is eliminated.
NO
Go to the next step.
5
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
Write section
Dirt or foreign matter on the dust-proof glass of the PH.
YES
2
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.
3
Photoconductor section
Dirt, scratches, or foreign matter on the photoconductor.
YES
• Clean.
•
4
Photoconductor section
Photoconductor drives faultily.
YES
• Correct.
•
5
1st transfer section
Scratches or dirt on 1st transfer roller.
YES
• Clean.
•
Replace the transfer belt unit.
6
Developing section
Toner bristles not even on the developing roller, resulting
in a line or band.
YES
NO
•
•
Replace the high voltage unit.
4-color troubleshooting procedure
Step
Section
Check item
Result
Action
1
Paper path
There is dirty or foreign matter on paper path.
YES
Check and clean the paper path
including the duplex section.
2
Transfer belt unit
Dirt, scratches, or foreign matter on the transfer belt.
YES
• Clean.
•
Replace the transfer belt unit.
3
Transfer belt unit
There is a positive contact between the transfer belt
application terminals and the high voltage unit
connection terminals (T1).
NO
Clean or correct the terminal.
4
Transfer belt unit
Transfer belt rotates faultily.
YES
• Correct.
•
Replace the transfer belt unit.
5
2nd transfer section
Dirt or foreign matter on the 2nd transfer roller.
YES
• Remove the foreign matter.
•
Replace the transfer roller
unit.
6
2nd transfer section
Faulty pressure/retraction operation of the 2nd transfer
roller.
YES
• Correct.
•
Replace the transfer roller
unit.
7
2nd transfer section
There is a positive contact between the application
terminals of the 2nd transfer and the connection
terminals (T2) and ground terminal of the high voltage
unit.
NO
Clean or correct the terminal.
8
Fusing unit
There is dirty or foreign matter on paper path of fusing
unit.
YES
Clean. (Disassembling the fusing
unit is prohibited.)
9
Service Mode -> Initialize
+ Image Stabilization
Select [Service Mode] -> [Imaging Process Adjustment] -
> [Stabilizer] -> [Init Image Stabilization] and
[Gradation Adjust], and the image trouble is eliminated.
YES
Readjust.
NO
•
•
Replace the high voltage unit.
•
16.3.6 Faint image, low image density (ID lowering)
Typical faulty images
The arrow in the exemplary image troubles indicates the paper feeding direction.
Y119930-3
Service Manual
Summary of Contents for d-Color MF 4003
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