Konica Minolta bizhub C658 Service Manual page 1640

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 Service Mode -> LD 1/2
Balance Adj.
2 Write section
3 Charging section
4 Photo conductor section
5 Photo conductor section
6 1st transfer section
7 Developing section
(4) 4-color troubleshooting procedure
Step Section
1 Paper path
2 Transfer belt unit
3 Transfer belt unit
4 Transfer belt unit
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
Select [Service Mode] -> [Machine] -> [LD adjustment] -
> [LD 1/2 Balance Adj.] 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.
Photo conductor 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 (Y: T1-4; M: T1-3; C: T1-2; K:
T1-1).
Transfer belt rotates faultily.
K-312
K TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
Result
NO
Only] and the image
NO
[Halftone YES
NO
Result
YES
YES
YES
YES
YES
YES
YES
NO
Result
YES
YES
NO
YES
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
Readjust.
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)
• Correct.
• 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)
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)
Action
Check and clean the paper path
including the duplex section.
• Clean.
• Replace the transfer belt unit.
(bizhub C368/C308/C258
bizhub C658/C558/C458)
Clean or correct the terminal.
• Correct.
• Replace the transfer belt unit.
(bizhub C368/C308/C258
bizhub C658/C558/C458)
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