d-Color MF4003/MF3303
L TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
L-132
Step Section Check item Result Action
2 Service Mode ->
Stabilizer
Select [Service Mode] -> [Imaging Process Adjustment] -
> [Stabilizer] -> [Stabilization Only] and the image
trouble is eliminated.
NO Go to the next step.
3 Service Mode ->
Gradation Adjust
Select [Service Mode] -> [Imaging Process Adjustment] -
> [Gradation Adjust] and the image trouble is eliminated.
NO Go to the next step.
4 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 to determine which
color causes the abnormal image.
1 to 3
colors
Go to the 1-color troubleshooting
procedure.
4
colors
Go to the 4-color troubleshooting
procedure.
None Go to scanner troubleshooting
procedure.
1-color troubleshooting procedure
Step Section Check item for the faulty color Result Action for the faulty color
1 Service Mode -> Table
Number
Select [Service Mode] -> [State Confirmation] -> [Table
Number]. The measured value is close to the standard
value.
• Developing bias: Vdc-C, Vdc-M, Vdc-Y, Vdc-K:
close to the standard value of -800 to 0
• Grid voltage: Vg-C, Vg-M, Vg-Y, Vg-K: close to the
standard value of -1600 to 0
NO • Check the high voltage unit
and the imaging unit for wiring
and connection.
• Replace the high voltage unit.
2 Write section Sharp white line or colored line is blurry. YES Clean the PH window.
3 Charging section Foreign matter on charging roller. 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.
4 Photoconductor section 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).
NO Clean or correct the terminal.
5 Developing section 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).
NO Clean or correct the terminal.
6 Photoconductor section Scratches on photoconductor. YES • Clean.
• Replace the imaging unit.
7 Photoconductor section Toner line or dirt on photoconductor. (improper cleaning) YES Replace the imaging unit.
8 1st transfer section 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.
9 1st transfer section Scratches or dirt on 1st transfer roller. YES • Clean.
• Replace the transfer belt unit.
10 Developing section Toner bristles not even on the developing roller, resulting
in a line or band.
YES Replace the imaging unit.
NO Replace the PH 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 or 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 or 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 2nd transfer section Dirt or foreign matter on the 2nd transfer roller. YES • Remove the foreign matter.
• Replace the transfer roller
unit.
6 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.
To Next Page
Loading...
Need help?
General