Konica Minolta bizhub C658 Service Manual page 1645

bizhub C658/C558/C458/C368/C308/C258
Step Section
4 Image check
5 Write section
6 Charging section
7 Transfer belt unit
8 2nd transfer section
9 IDC sensor
10 Service Mode ->
Stabilizer
11 Service Mode ->
Gradation Adjust
12 Service Mode -> Max
Image Density Adj
13 Connector connection
14 Service Mode -> Initialize
+ Image Stabilization
16.3.10 Incorrect color image registration
(1) Typical faulty images
The arrow in the exemplary image troubles indicates the paper feeding direction.
Check item
• Select [Service Mode] -> [Test Mode] ->
Solid 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 8 colors on one sheet of
paper.
• Check the image after printing and the abnormal
image is evident.
Dirt or foreign matter on the dust-proof glass of the PH.
Foreign matter on charging roller.
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).
There is a positive contact between the application
terminals of the 2nd transfer and the connection
terminals (T2, E) and ground terminal of the high
voltage unit.
• IDC sensor is dirty.
• IDC sensor shutter does not operate properly.
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] -> [Imaging Process Adjustment]
- > [Max Image Density Adj] and make the necessary
adjustment, and the image trouble is eliminated.
Faulty connector connection the high voltage unit (CN1,
CN2) and MFP board (CN22E, CN36E).
Select [Service Mode] -> [Imaging Process Adjustment]
-> [Stabilizer] -> [Initialize + Image
[Gradation Adjust], and the image trouble is eliminated.
K-317
K TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
Result
[8 Color YES
YES
YES
NO
NO
YES
NO
Only] and the image
NO
NO
YES
YES
Stabilization] and
NO
Action
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 or correct the terminal.
Clean or correct the terminal.
• Clean.
• Clean or correct the IDC
sensor shutter.
Go to the next step.
Go to the next step.
Go to the next step.
Reconnect the connector.
Readjust.
• Replace the transfer belt unit.
(bizhub C368/C308/C258
bizhub C658/C558/C458)
• Replace the high voltage
unit. (bizhub C368/C308/
C258 / bizhub C658/C558/
C458)
• Replace the MFP board.
(bizhub C368/C308/C258
bizhub C658/C558/C458)
/
/