Konica Minolta bizhub C658 Service Manual page 1647

bizhub C658/C558/C458/C368/C308/C258
Step Section
6 When DF is being used:
Registration Loop Adj.
7 When DF-704 or dual
scan document feeder is
being used: Paper path
*: Apply FLOIL No. 947P or Launa 40 oil to the scanner rails. FLOIL is a product manufactured by KANTO KASEI LTD. (http://www.kanto-
kasei.co.jp/).
16.3.11 Foggy background
(1) Typical faulty images
The arrow in the exemplary image troubles indicates the paper feeding direction.
(2) Initial troubleshooting procedure
Step Section
1 Malfunction code
2 Paper Setting
3 Damp paper
4 IDC sensor
5 Service Mode ->
Stabilizer
6 Service Mode ->
Gradation Adjust
7 Service Mode -> Charge
AC Output fine
adjustment
8 Service Mode -> Image
Background Adj
9 Image check
Check item
Select [Service Mode] -> [ADF] ->
Adj.] and make the necessary adjustment, and the
image trouble is eliminated.
There is dirty on paper path or roller of DF-704 or dual
scan document feeder.
Check item
The maintenance call mark is displayed on the panel.
The paper to be used for printing does not match the
paper type and size of paper setting selected on the
machine.
Paper is damp.
• 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.
Fog occurs unevenly on the left-hand side with respect
to the paper feeding direction. Or fog occurs in part of
the paper.
The fog is reduced when [Service Mode] -> [Imaging
Process Adjustment] -> [Charge AC Output fine
adjustment] are selected and the setting value is
increased.
Select [Service Mode] -> [Imaging Process Adjustment]
-> [Image Background Adj] and [Stabilizer] and the
image trouble is eliminated.
• Select [Service Mode] -> [Test Mode] ->
Pattern]. Select "SINGLE", "HYPER", "Gradation",
"1-Sided", "CMYK", "600dpi", and "Normal", enter
"20" for CD width, "20" for FD width, and "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.
K-319
K TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
Result
[Registration Loop YES
NO
YES
NO
Result
YES
YES
YES
YES
NO
Only] and the image
NO
NO
NO
[Lattice 1 to 3
colors
colors
Not
availab
Action
• Replace the scanner drive
board. (bizhub C368/C308/
C258 / bizhub C658/C558/
C458)
Readjust.
Replace the CCD unit. (bizhub
C368/C308/C258 / bizhub C658/
C558/C458)
Clean.
Replace the CIS module.
C368/C308/C258 / bizhub C658/
C558/C458)
Action
Perform the relevant
troubleshooting procedure
corresponding to the malfunction
code.
Make the paper setting again on
the machine.
Change paper to one just
unwrapped from its package.
• Clean.
• Clean or correct the IDC
sensor shutter.
Go to the next step.
Go to the next step.
Return the setting value to the
original one and go to the next
step.
Set the fog margin value back to
the original one and go to the next
step.
Go to the 1-color troubleshooting
procedure.
4 Go to the 4-color troubleshooting
procedure.
Go to scanner troubleshooting
procedure.
le
(bizhub