Konica Minolta bizhub C658 Service Manual page 1652

bizhub C658/C558/C458/C368/C308/C258
Step Section
4 Service Mode ->
Gradation Adjust
5 Service Mode -> Charge
AC Output fine
adjustment
6 Service Mode -> Primary
transfer adj.
7 Image check
(3) 1-color troubleshooting procedure
Step Section
1 Write section
2 Charging section
3 Photo conductor section
4 Photo conductor section
5 Developing section
6 Connector connection
7 Service Mode -> Initialize
+ Image Stabilization
(4) 4-color troubleshooting procedure
Step Section
1 Transfer belt unit
Check item
Select [Service Mode] -> [Imaging Process Adjustment]
-> [Gradation Adjust] and the image trouble is
eliminated.
Fine colored dots evident on the left-hand side with
respect to the paper feeding direction. Or fine color
spots are evident on a particular portion in the paper.
The color spots are reduced when [Service Mode] ->
[Imaging Process Adjustment] ->
fine adjustment] are selected and the setting value is
increased.
Select [Service Mode] -> [Imaging Process Adjustment]
-> [Transfer Voltage Fine Adj] and the image trouble is
eliminated.
* Decrease the setting value for color spots.
• Select [Service Mode] -> [Test Mode] ->
Pattern]. Select "SINGLE", "HYPER", "Gradation",
and "1-Sided", enter "64" for Density, and load tray
2 with A3 paper. Press the start key. This runs a
print cycle of 4 colors on one sheet of paper.
• Check the image after printing to determine which
color causes the abnormal image.
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 photo
conductor.
There is a positive contact between the electrostatic
charger application terminals and the high voltage unit
connection terminals.
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).
bizhub C368/C308/C258:
Faulty connector connection the high voltage unit (CN1,
CN2), MFP board (CN18, CN22E, CN36E) and PH
relay board (CN1, CN2).
bizhub C658/C558/C458:
Faulty connector connection the high voltage unit (CN1,
CN2), MFP board (CN6, CN30E, CN33E) and PH relay
board (CN1, CN2).
Select [Service Mode] -> [Imaging Process Adjustment]
-> [Stabilizer] -> [Initialize + Image
[Gradation Adjust], and the image trouble is eliminated.
Check item
Dirt, scratches, or foreign matter on the transfer belt.
K-324
K TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
Result
NO
NO
[Charge AC Output
NO
[Solid 1 to 3
colors
4
colors
Not
availab
le
Result
YES
YES
YES
NO
NO
YES
YES
Stabilization] and
NO
Result
YES
Action
Go to the next step.
Return the setting value to the
original one and go to the next
step.
Return the setting value to the
original one and go to the next
step.
Go to the 1-color troubleshooting
procedure.
Go to the 4-color troubleshooting
procedure.
Go to scanner troubleshooting
procedure.
Action for the faulty color
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 or correct the terminal.
Clean or correct the terminal.
Reconnect the connector.
Readjust.
• Replace the drum 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
• Clean.
/
/