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bizhub C4000i/C3300i
Step
Section
2
Write section
3
Charging section
4
Photoconductor section
5
Developing section
6
Photoconductor section
7
Photoconductor section
8
Photoconductor section
9
1st transfer section
10
1st transfer section
11
Developing section
4-color troubleshooting procedure
Step
Section
1
Paper path
2
Transfer belt unit
3
Transfer belt unit
4
Transfer belt unit
5
2nd transfer section
6
2nd transfer section
7
Fusing unit
8
Fusing unit
12.3.3 White line 2, White band 2, Color line 2, Color band 2
Typical faulty images
The arrow in the exemplary image troubles indicates the paper feeding direction.
Check item for the faulty color
Sharp white line or colored line is blurry.
Foreign matter on charging roller.
There is a positive contact between the electrostatic
charger application terminals and the high voltage unit
connection terminals (Y: C4, M: C3, C: C2, K: C1).
There is a positive contact between the developing bias
application terminals and the high voltage unit
connection terminals (Y: B4; M: B3; C: B2; K: B1).
Scratches on photoconductor.
Toner line or dirt on photoconductor. (improper cleaning)
Faint lines evident on the entire surface as if the surface
were brushed off.
There is a positive contact between the transfer belt
application terminals and the high voltage unit
connection terminals (T1).
Scratches or dirt on 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).
Dirt or foreign matter on 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.
Scratches on roller, pad, and belt in fusing unit.
L-88
L TROUBLESHOOTING > 12. IMAGE QUALITY PROBLEM
Result
YES
Clean the PH window.
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.
NO
Clean or correct the terminal.
NO
Clean or correct the terminal.
YES
• Clean.
•
YES
Replace the imaging unit.
YES
• Select [Service Mode] ->
•
NO
Clean or correct the terminal.
YES
• Clean.
•
YES
Replace the imaging unit.
NO
Replace the PH unit.
Result
YES
Check or clean the paper path
including the duplex section.
YES
• Check or clean the cleaning
•
YES
• Clean.
•
NO
Clean or correct the terminal.
YES
• Remove the foreign matter.
•
NO
Clean or correct the terminal.
YES
Clean. (Disassembling the fusing
unit is prohibited.)
YES
Replace the fusing unit.
NO
• Replace the high voltage unit.
•
Action for the faulty color
Replace the imaging unit.
[Counter] -> [Life] and check
the counter value of the
Imaging Unit.
Replace the imaging unit
having the greatest counter
value with a new one. (Not
the imaging unit of the color
that has developed the lines,
but the imaging unit having
the greatest counter value)
Replace the transfer belt unit.
Action
blade.
Replace the transfer belt unit.
Replace the transfer belt unit.
Replace the transfer roller
unit.
Replace the base board.
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