d-Color MF4003/MF3303
L TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
L-133
Step
Section
Check item
Result
Action
7
Fusing unit
Dirt or foreign matter on paper path or separation claw of
the fusing unit.
YES
Clean. (Disassembling the fusing
unit is prohibited.)
8
Fusing unit
Scratches on roller, pad, and belt in fusing unit.
YES
NO
•
Replace the high voltage unit.
•
Scanner troubleshooting procedure
Step
Section
Check item
Result
Action
1
Original
Original is damaged or dirty.
YES
Change the original.
2
Original Type
Select [Copy] -> [Original Type] and change the setting,
and the image trouble is eliminated.
YES
Correct the setting.
3
When original glass is
being used: Service Mode
-> Scan Area
Select [Service Mode] -> [Machine] -> [Scan Area] ->
[Image Position: Leading Edge] and make the necessary
adjustment, and the image trouble is eliminated.
NO
Go to the next step.
4
When original glass is
being used
Original glass or original pad is dirty.
YES
Clean.
NO
5
When DF is being used:
1st side
Original reading glass is dirty.
YES
Clean.
NO
6
When DF is being used:
2nd side
CIS glass is dirty.
YES
Clean.
NO
Replace the DF CIS module assy.
16.3.4 Uneven density 1
Typical faulty images
The arrow in the exemplary image troubles indicates the paper feeding direction.
Initial 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
IDC sensor
IDC sensor is dirty.
YES
Clean.
3
Service Mode ->
Stabilizer
Select [Service Mode] -> [Imaging Process Adjustment] -
> [Stabilizer] -> [Stabilization Only] and the image
trouble is eliminated.
NO
Go to the next step.
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
Service Mode -> TCR
Level Setting
Select [Service Mode] -> [Imaging Process Adjustment] -
> [TCR Level Setting] and make the necessary
adjustment, and the image trouble is eliminated.
NO
Go to the next step.
2
Write section
Dirt or foreign matter on the dust-proof glass of the PH.
YES
3
Charging section
Foreign matter on charging roller.
YES
Lightly wipe the surface clean of
foreign matter using hydro-wipe
(65AA-99##).
Y119930-3
Service Manual
Summary of Contents for d-Color MF 4003
Page 1: ...Multifunction Digital Copier d Color MF4003 MF3303 Service Manual Version 2 0 Code Y119930 3 ...
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