Konica Minolta bizhub C658 Service Manual page 1657

bizhub C658/C558/C458/C368/C308/C258
Step Section
7 DF-704 or dual scan
document feeder is being
used: 2nd side
8 DF-704 or dual scan
document feeder is being
used: 2nd side
9 Service Mode -> Self-
diagnostic
*1: Apply DURASURF KD-453S to the shaft. DURASURF is a product manufactured by Harves Co., Ltd. (http://www.harves.co.jp).
*2: 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/).
16.3.17 Uneven pitch
(1) Typical faulty images
The arrow in the exemplary image troubles indicates the paper feeding direction.
(2) Initial troubleshooting procedure
Step Section
1 Paper Setting
2 Service Mode ->
Stabilizer
3 Service Mode ->
Gradation Adjust
4 Image check
(3) 1-color troubleshooting procedure
Step Section
1 Uneven pitch at 94 mm
interval
Check item
Faulty connector connection the DF power supply
(CN1), relay connector (CN117), main body connection
section (CN46) and DC power supply (CN004).
bizhub C368/C308/C258:
Faulty connector connection the CIS module (J221),
dual scan image processing board (CN1) and MFP
board (CN22).
bizhub C658/C558/C458:
Faulty connector connection the CIS module (J101),
dual scan image processing board (CN2, CN1) and
MFP board (CN24).
Replace the connection cable between the CIS module
and the MFP board. This eliminates the trouble.
Select [Service Mode] -> [State Confirmation] -> [Self-
diagnostic] -> [Check All] and perform the function.
Then, "NG" appears.
Check item
The paper to be used for printing does not match the
paper type and size of paper setting selected on the
machine.
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
Dirt, scratches, or foreign matter on the photo
conductor.
K-329
K TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
Result
YES
YES
YES
NO
Result
YES
NO
Only] and the image
NO
[Halftone YES
NO
Result
YES
Action
Reconnect the connector.
Replace the connection cable.
Take relevant action
corresponding to the check item in
which "NG" has appeared.
• Replace the CIS module.
(bizhub C368/C308/C258
bizhub C658/C558/C458)
• Replace the dual scan image
processing board. (bizhub
C368/C308/C258 / bizhub
C658/C558/C458)
• Replace the MFP board.
(bizhub C368/C308/C258
bizhub C658/C558/C458)
Action
Make the paper setting again on
the machine.
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
• Clean.
• Replace the drum unit.
(bizhub C368/C308/C258
bizhub C658/C558/C458)
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