Konica Minolta bizhub C658 Service Manual page 1643

bizhub C658/C558/C458/C368/C308/C258
Step Section
4 Service Mode -> Initialize
+ Image Stabilization
(5) Scanner troubleshooting procedure
Step Section
1 Original Type
2 When original glass is
being used
3 Parts along scanning
path
4 Main body side_shading
sheet
5 • When DF is being
used: 1st side
• When DF-629 is
being used: 2nd side
6 DF-704 or dual scan
document feeder is being
used: 2nd side
16.3.8 Gradation reproduction failure
(1) Typical faulty images
The arrow in the exemplary image troubles indicates the paper feeding direction.
(2) Troubleshooting procedure
Step Section
1 Malfunction code
2 Paper Setting
3 Image check
Check item
Select [Service Mode] -> [Imaging Process Adjustment]
-> [Stabilizer] -> [Initialize + Image
[Gradation Adjust], and the image trouble is eliminated.
Check item
Select [Copy setting] -> [Original Type] and change the
setting, and the image trouble is eliminated.
Original glass or original pad is dirty.
Mirror, lens, light guide or reflectors is dirty.
Shading sheet of main body is dirty.
Original reading glass or original reading glass cleaning
brush is dirty.
• Shading correction surface of DF-704 or dual scan
document feeder is dirty.
• CIS glass or CIS cleaning brush is dirty.
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.
• Select [Service Mode] -> [Test Mode] ->
Pattern]. Select "SINGLE", "HYPER", "Gradation",
"1-Sided", "CMYK", "Full Bleed", and "12
gradations", 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.
K-315
K TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
Result
YES
Stabilization] and
NO
Result
YES
YES
YES
YES
NO
YES
NO
YES
NO
Result
YES
YES
[Gradation -
Action
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)
Action
Correct the setting.
Clean.
Clean.
Clean.
• Replace the LED exposure
unit. (bizhub C368/C308/
C258 / bizhub C658/C558/
C458)
• Replace the CCD unit.
(bizhub C368/C308/C258
bizhub C658/C558/C458)
Clean.
• Replace the LED exposure
unit. (bizhub C368/C308/
C258 / bizhub C658/C558/
C458)
• Replace the CCD unit.
(bizhub C368/C308/C258
bizhub C658/C558/C458)
Clean.
Replace the CIS module. (bizhub
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.
Go to the next step.
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