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bizhub C4000i/C3300i
Step
Section
5
1st transfer section
6
1st transfer section
7
Developing section
4-color troubleshooting procedure
Step
Section
1
Paper path
2
Transfer belt unit
3
Transfer belt unit
4
Transfer belt unit
5
Transfer belt unit
6
2nd transfer section
7
2nd transfer section
8
2nd transfer section
9
Fusing unit
10
Service Mode -> Initialize
+ Image Stabilization
12.3.5 Uneven density 2
Typical faulty images
The arrow in the exemplary image troubles indicates the paper feeding direction.
Initial troubleshooting procedure
Step
Section
1
Paper Setting
2
IDC sensor
3
Service Mode ->
Stabilizer
4
Service Mode ->
Gradation Adjust
5
Image check
Check item for the faulty color
Dirt, scratches, or foreign matter on the 1st transfer
roller.
Faulty pressure/retraction operation of the 1st transfer
roller.
Toner bristles not even on the developing roller, resulting
in a line or band.
Check item
There is dirty or foreign matter on paper path.
Lines that can be removed by cleaning are evident on
the transfer belt. (improper cleaning)
Dirt, scratches, or foreign matter on the transfer belt.
There is a positive contact between the transfer belt
application terminals and the high voltage unit
connection terminals (T1).
Transfer belt rotates faultily.
Dirt or foreign matter on the 2nd transfer roller.
Faulty pressure/retraction operation of the 2nd transfer
roller.
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.
There is dirty or foreign matter on paper path of fusing
unit.
Select [Service Mode] -> [Imaging Process Adjustment] -
> [Stabilizer] -> [Initialize + Image Stabilization] and
[Gradation Adjust], and the image trouble is eliminated.
Check item
The paper to be used for printing does not match the
paper type and size of paper setting selected on the
machine.
IDC sensor is dirty.
Select [Service Mode] -> [Imaging Process Adjustment] -
> [Stabilizer] -> [Stabilization Only] and the image
trouble is eliminated.
Select [Service Mode] -> [Imaging Process Adjustment] -
> [Gradation Adjust] and the image trouble is eliminated.
• Select [Service Mode] -> [Test Mode] -> [Halftone
Pattern].
Select "SINGLE", "HYPER", "Error diffusion", "1-
L-91
L TROUBLESHOOTING > 12. IMAGE QUALITY PROBLEM
Result
•
YES
• Clean.
•
YES
• Correct or replace the drive
•
YES
Replace the imaging unit.
NO
•
•
Result
YES
Check and clean the paper path
including the duplex section.
YES
• Check and clean the cleaning
•
YES
• Clean.
•
NO
Clean or correct the terminal.
YES
Replace the transfer belt unit.
YES
• Remove the foreign matter.
•
YES
• Correct.
•
NO
Clean or correct the terminal.
YES
Clean. (Disassembling the fusing
unit is prohibited.)
YES
Readjust.
NO
•
•
•
Result
YES
Make the paper setting again on
the machine.
YES
Clean.
NO
Go to the next step.
NO
Go to the next step.
YES
Go to the 1-color troubleshooting
procedure.
Action for the faulty color
Replace the imaging unit.
Replace the transfer belt unit.
system.
Replace the transfer belt unit.
Replace the PH unit.
Replace the high voltage unit.
Action
blade.
Replace the transfer belt unit.
Replace the transfer belt unit.
Replace the transfer roller
unit.
Replace the transfer roller
unit.
Replace the fusing unit.
Replace the high voltage unit.
Replace the base board.
Action
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