Olivetti d-Color MF4003 Service Manual page 533

d-Color MF4003/MF3303
Step Section
4 Service Mode ->
Gradation Adjust
5 Image check
1-color troubleshooting procedure
Step Section
1 Write section
2 Charging section
3 Photoconductor section
4 Photoconductor section
5 1st transfer section
6 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 2nd transfer section
8 Fusing unit
9 Service Mode -> Initialize
+ Image Stabilization
16.3.6 Faint image, low image density (ID lowering)
Typical faulty images
The arrow in the exemplary image troubles indicates the paper feeding direction.
Y119930-3
Check item
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-
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 and the abnormal
image occurs only with one color.
Check item for the faulty color
Dirt or foreign matter on the dust-proof glass of the PH.
Foreign matter on charging roller.
Dirt, scratches, or foreign matter on the photoconductor.
Photoconductor drives faultily.
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.
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.
L-135
L TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
Result
NO Go to the next step.
YES Go to the 1-color troubleshooting
procedure.
NO Go to the 4-color troubleshooting
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.
YES • Clean.
•
YES • Correct.
•
YES • Clean.
•
YES Replace the imaging unit.
NO •
•
Result
YES Check and clean the paper path
including the duplex section.
YES • Clean.
•
NO Clean or correct the terminal.
YES • Correct.
•
YES • Remove the foreign matter.
•
YES • Correct.
•
NO Clean or correct the terminal.
YES Clean. (Disassembling the fusing
unit is prohibited.)
YES Readjust.
NO •
•
•
Action
Action for the faulty color
Replace the imaging unit.
Replace the imaging unit.
Replace the transfer belt unit.
Replace the PH unit.
Replace the high voltage unit.
Action
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.
Service Manual