Konica Minolta bizhub C658 Service Manual page 1662

bizhub C658/C558/C458/C368/C308/C258
Step Section
4 When DF is being used
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
16.3.22 Moire
(1) Typical faulty images
The arrow in the exemplary image troubles indicates the paper feeding direction.
(2) Initial troubleshooting procedure
Step Section
1 Original
2 Original Type
3 Original direction
4 Service Mode ->
Stabilizer
5 Service Mode ->
Gradation Adjust
6 Image check
(3) Engine troubleshooting procedure
Step Section
1 Service Mode -> Paper
Feed Direction Adj.
2 Service Mode -> Initialize
+ Image Stabilization
Check item
DF does not lie flat.
Document reading glass tilts.
CIS glass or CIS cleaning brush is tilted.
Check item
Original is damaged or dirty.
Select [Copy setting] -> [Original Type] and change the
setting, and the image trouble is eliminated.
Change the direction in which the original is placed.
This eliminates moire.
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 is evident.
Check item
Select [Service Mode] -> [Machine] -> [Printer Area] ->
[Paper Feed Direction Adj.] and make the necessary
adjustment, and the image trouble is eliminated.
Select [Service Mode] -> [Imaging Process Adjustment]
-> [Stabilizer] -> [Initialize + Image
[Gradation Adjust], and the image trouble is eliminated.
K-334
K TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
Result
YES
YES
NO
YES
NO
Result
YES
NO
YES
NO
Only] and the image
NO
[Halftone YES
NO
Result
NO
YES
Stabilization] and
NO
Action
• Adjust the DF height.
(DF-704 / DF-629 / Dual scan
document feeder)
• Replace DF if it is deformed
or hinges are broken.
Corrected to the correct position.
• 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)
Corrected to the correct position.
Replace the CIS module. (bizhub
C368/C308/C258 / bizhub C658/
C558/C458)
Action
Change the original.
Go to the next step.
Change the original direction.
Go to the next step.
Go to the next step.
Go to engine troubleshooting
procedure.
Go to scanner troubleshooting
procedure.
Action
Go to the next step.
Readjust.
• Replace the PH unit. (bizhub
C368/C308/C258 / bizhub
C658/C558/C458)
• Replace the MFP board.
(bizhub C368/C308/C258
bizhub C658/C558/C458)
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