d-Color MF4003/MF3303
L TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
L-134
Step
Section
Check item for the faulty color
Result
Action for the faulty color
Note: Do not apply a strong force
to the surface of the charging
roller, as doing so can damage the
surface.
4
Photoconductor section
Dirt, scratches, or foreign matter on the photoconductor.
YES
• Clean.
•
5
1st transfer section
Dirt, scratches, or foreign matter on the 1st transfer
roller.
YES
• Clean.
•
Replace the transfer belt unit.
6
1st transfer section
Faulty pressure/retraction operation of the 1st transfer
roller.
YES
• Correct or replace the drive
system.
•
Replace the transfer belt unit.
7
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
Lines that can be removed by cleaning are evident on
the transfer belt. (improper cleaning)
YES
• Check and clean the cleaning
blade.
•
Replace the transfer belt unit.
3
Transfer belt unit
Dirt, scratches, or foreign matter on the transfer belt.
YES
• Clean.
•
Replace the transfer belt unit.
4
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.
5
Transfer belt unit
Transfer belt rotates faultily.
YES
Replace the transfer belt unit.
6
2nd transfer section
Dirt or foreign matter on the 2nd transfer roller.
YES
• Remove the foreign matter.
•
Replace the transfer roller
unit.
7
2nd transfer section
Faulty pressure/retraction operation of the 2nd transfer
roller.
YES
• Correct.
•
Replace the transfer roller
unit.
8
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.
9
Fusing unit
There is dirty or foreign matter on paper path of fusing
unit.
YES
Clean. (Disassembling the fusing
unit is prohibited.)
10
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.
•
16.3.5 Uneven density 2
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.
Service Manual
Y119930-3
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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