Olivetti d-Color MF4003 Service Manual page 530

d-Color MF4003/MF3303
Step Section
2 Service Mode ->
Stabilizer
3 Service Mode ->
Gradation Adjust
4 Image check
1-color troubleshooting procedure
Step Section
1 Service Mode -> Table
Number
2 Write section
3 Charging section
4 Photoconductor section
5 Developing section
6 Photoconductor section
7 Photoconductor section
8 1st transfer section
9 1st transfer section
10 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
Service Manual
Check item
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-
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.
Check item for the faulty color
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
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)
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.
L-132
L TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
Result
NO Go to the next step.
NO 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.
None Go to scanner troubleshooting
procedure.
Result
NO • Check the high voltage unit
•
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.
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.
Action
Action for the faulty color
and the imaging unit for wiring
and connection.
Replace the high voltage unit.
Replace the imaging unit.
Replace the transfer belt unit.
Action
blade.
Replace the transfer belt unit.
Replace the transfer belt unit.
Replace the transfer roller
unit.
Y119930-3