Konica Minolta bizhub C658 Service Manual page 1638

bizhub C658/C558/C458/C368/C308/C258
Step Section
3 Service Mode ->
Stabilizer
4 Service Mode ->
Gradation Adjust
5 Image check
(3) 1-color troubleshooting procedure
Step Section
1 High image density
original
2 Service Mode -> LD 1/2
Balance Adj.
3 Service Mode -> TCR
Level Setting
4 Write section
5 Charging section
6 Photo conductor section
7 1st transfer section
8 1st transfer section
9 Developing section
10 Developing section
Check item
Select [Service Mode] -> [Imaging Process Adjustment]
-> [Stabilizer] -> [Stabilization
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 and the abnormal
image occurs only with one color.
Check item for the faulty color
Uneven density in sub scan direction occurs at a pitch
of 40 mm to 50 mm when a multi-copy cycle is run
using an original with high image density (50% or
more).
Select [Service Mode] -> [Machine] -> [LD adjustment] -
> [LD 1/2 Balance Adj.] and the image trouble is
eliminated.
Select [Service Mode] -> [Imaging Process Adjustment]
- > [TCR Level Setting] and make the necessary
adjustment, and the image trouble is eliminated.
Dirt or foreign matter on the dust-proof glass of the PH.
Foreign matter on charging roller.
Dirt, scratches, or foreign matter on the photo
conductor.
Dirt, scratches, or foreign matter on the 1st transfer
roller.
Faulty pressure/retraction operation of the 1st transfer
roller.
Toper hopper operates improperly or contains foreign
matter.
Toner bristles not even on the developing roller,
resulting in a line or band.
K-310
K TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
Result
NO
Only] and the image
NO
[Halftone YES
NO
Result
YES
NO
NO
YES
YES
YES
YES
YES
YES
YES
NO
Action
Go to the next step.
Go to the next step.
Go to the 1-color troubleshooting
procedure.
Go to the 4-color troubleshooting
procedure.
Action for the faulty color
Feed 10 to 20 blank sheets of
paper with no originals placed, as
the developing unit fails to keep
up with a high demand for toner.
Go to the next step.
Go to the next step.
Clean the PH window. (bizhub
C368/C308/C258 / bizhub C658/
C558/C458)
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.
• Clean.
• Replace the drum unit.
(bizhub C368/C308/C258
bizhub C658/C558/C458)
• Clean.
• Replace the transfer belt unit.
(bizhub C368/C308/C258
bizhub C658/C558/C458)
• Correct or replace the drive
system.
• Replace the transfer belt unit.
(bizhub C368/C308/C258
bizhub C658/C558/C458)
• Correct or remove.
• Replace the hopper drive
unit. (bizhub C368/C308/
C258 / bizhub C658/C558
bizhub C458)
Replace the developing unit.
(bizhub C368/C308/C258 / bizhub
C658/C558/C458)
• Replace the PH unit. (bizhub
C368/C308/C258 / bizhub
C658/C558/C458)
• Replace the high voltage
unit. (bizhub C368/C308/
C258 / bizhub C658/C558/
C458)
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