Konica Minolta bizhub C658 Service Manual page 1632

bizhub C658/C558/C458/C368/C308/C258
Step
1 Check the set position of paper or paper length guide / paper width guide, and correct it if needed.
*For a paper tray that uses only a specific paper size, it is possible to fix the paper width guide to a specific paper size
position by attaching a screw to the screw hole on the paper width guide (back side). It is possible to prevent problems
due to wrong paper setting, but be careful as users will not be able to change paper sizes by themselves.
2 If the Right door unit / Regist unit (inner door on the vertical transport section) is half-open, make it correct position.
3 Check the paper path, transport rollers, and registration section, and remove any paper pieces / foreign matters / paper
dust.
4 Perform test printing to check whether the problem has been resolved.
If it can not be resolved, confirm "(2) individual adjustment items".
(2) Individual adjustment items
Skewed image
NOTE
* If the trouble can not be solved by the above adjustment, reinstall the Right door unit /Regist unit.
door unit (C658/C558/C458)/Regist unit (C358/C308/C258)/Regist unit
16.3.3 White line 1, White band 1, Color line 1, Color band 1
(1) Typical faulty images
The arrow in the exemplary image troubles indicates the paper feeding direction.
[1] White line
[3] Color line
(2) Initial troubleshooting procedure
Step Section
1 Paper Setting
2 Service Mode ->
Stabilizer
3 Service Mode ->
Gradation Adjust
4 Image check
(3) 1-color troubleshooting procedure
Step Section
1 Service Mode -> Table
Number
2 Write section
3 Charging section
Printer Reg. Loop Adj.
[1]
[2]
The paper to be used for printing does not match the
paper type and size of paper setting selected on the
machine.
Select [Service Mode] -> [Imaging Process Adjustment]
-> [Stabilizer] ->
trouble is eliminated.
Select [Service Mode] -> [Imaging Process Adjustment]
-> [Gradation Adjust] and the image trouble is
eliminated.
• Select [Service Mode] -> [Test Mode] ->
Pattern]. Select "SINGLE", "HYPER", "Gradation",
"1-Sided", "CMYK", and "Full Bleed", enter "64" for
Density, and load tray 2 with A3 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] ->
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 300 V to 400 V (100
V to 800 V)
• Grid voltage: Vg-c, Vg-M, Vg-Y, Vg-K: close to the
standard value of 450 V to 550 V (200 V to 1000 V)
Sharp white line or colored line is blurry.
Foreign matter on charging roller.
K TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
Content
(C658/C558/C458)
[3]
[4]
[2] White band
[4] Color band
Check item
[Stabilization Only] and the image
[Halftone
K-304
Right door unit (C358/C308/C258)/Right
Result
YES Make the paper setting again on
the machine.
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.
Not Go to scanner troubleshooting
availab procedure.
le
Result Action for the faulty color
[Table NO • Check the high voltage unit,
developing unit, and the
drum unit for wiring and
connection.
• Replace the high voltage
unit. (bizhub C368/C308/
C258 / bizhub C658/C558/
C458)
YES Clean the PH window.
C368/C308/C258
C558/C458)
YES Lightly wipe the surface clean of
foreign matter using hydro-wipe
(65AA-99##).
Action
(bizhub
/ bizhub C658/