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bizhub C4000i/C3300i
Step
Section
6
Service Mode ->
Gradation Adjust
7
Service Mode -> Charge
Voltage Adjustment
8
Service Mode -> Image
Background Adj
9
Image check
1-color troubleshooting procedure
Step
Section
1
Write section
2
Charging section
3
Photoconductor section
4
Developing section
5
Service Mode -> TCR
data
6
Service Mode -> Max
Image Density Adj
7
Connector connection
8
Service Mode -> Initialize
+ Image Stabilization
4-color troubleshooting procedure
Step
Section
1
Transfer belt unit
2
2nd transfer section
3
Service Mode -> Max
Image Density Adj
4
Service Mode -> Initialize
+ Image Stabilization
Check item
Select [Service Mode] -> [Imaging Process Adjustment] -
> [Gradation Adjust] and the image trouble is eliminated.
Fog occurs unevenly on the left-hand side with respect
to the paper feeding direction. Or fog occurs in part of
the paper.
The fog is reduced when [Service Mode] -> [Imaging
Process Adjustment] -> [Charge Voltage Adjustment] are
selected and the setting value is increased.
Select [Service Mode] -> [Imaging Process Adjustment] -
> [Image Background Adj] and [Stabilizer] and the image
trouble is eliminated.
• Select [Service Mode] -> [Test Mode] -> [Lattice
Pattern]. Select "SINGLE", "HYPER", "Error
diffusion", "1-Sided", "CMYK", "600dpi", and
"Normal", enter "20" for CD width, "20" for FD width,
and "255" 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 to determine which
color causes the abnormal image.
Check item for the faulty color
Dirt or foreign matter on the dust-proof glass of the PH.
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).
Select [Service Mode] -> [State Confirmation] -> [Level
History 1] and the measured value is correct.
TCR-C, TCR-M, TCR-Y, TCR-K: normal value 5 to 8%
Select [Service Mode] -> [Imaging Process Adjustment] -
> [Max Image Density Adj] and make the necessary
adjustment, and the image trouble is eliminated.
Faulty connector connection the high voltage unit (CN1)
and base board (CN4E).
Select [Service Mode] -> [Imaging Process Adjustment] -
> [Stabilizer] -> [Initialize + Image Stabilization] and
[Gradation Adjust], and the image trouble is eliminated.
Check item
There is a positive contact between the transfer belt
application terminals and the high voltage unit
connection terminals (T1).
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.
Select [Service Mode] -> [Imaging Process Adjustment] -
> [Max Image Density Adj] and make the necessary
adjustment, and the image trouble is eliminated.
Select [Service Mode] -> [Imaging Process Adjustment] -
> [Stabilizer] -> [Initialize + Image Stabilization] and
[Gradation Adjust], and the image trouble is eliminated.
L-97
L TROUBLESHOOTING > 12. IMAGE QUALITY PROBLEM
Result
NO
Go to the next step.
NO
Return the setting value to the
original one and go to the next
step.
NO
Set the fog margin value back to
the original one and go to the next
step.
1 to 3
Go to the 1-color troubleshooting
colors
procedure.
4
Go to the 4-color troubleshooting
colors
procedure.
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.
NO
Select [Service Mode] -> [Imaging
Process Adjustment] -> [Manual
Toner Add] and perform the
function.
NO
Go to the next step.
YES
Reconnect the connector.
YES
Readjust.
NO
•
•
•
Result
NO
Clean or correct the terminal.
NO
Clean or correct the terminal.
NO
Go to the next step.
YES
Readjust.
NO
•
•
•
Action
Action for the faulty color
Replace the imaging unit.
Replace the PH unit.
Replace the high voltage unit.
Action
Replace the transfer belt unit.
Replace the high voltage unit.
Replace the base board.
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