Konica Minolta bizhub C658 Service Manual page 1635

bizhub C658/C558/C458/C368/C308/C258
Step Section
18 Line occurring due to
faulty shading
19 Parts along scanning
path
DF-704 or dual scan document feeder side_original reading section
20 CIS glass cleaning
21 CIS reading section
22 CIS cleaning brush
23 Shading sheet
24 When DF-704 or dual
scan document feeder is
being used: 2nd side:
End face of original is
reproduced as a line
25 When DF-704 or dual
scan document feeder is
being used: 2nd side:
Home Read Position
26 Scanning section
16.3.4 White line 2, White band 2, Color line 2, Color band 2
(1) Typical faulty images
The arrow in the exemplary image troubles indicates the paper feeding direction.
[1] [2]
[1] White line
[3] Color line
(2) Initial troubleshooting procedure
Step Section
1 Paper Setting
2 Service Mode ->
Stabilizer
3 Service Mode ->
Gradation Adjust
4 Image check
Check item
Select [Service Mode] -> [Machine] -> [Scan Area] ->
[Image Position: Leading Edge] and make the
necessary adjustment, and the image trouble is
eliminated.
Mirror, lens, light guide or reflectors is dirty.
CIS glass is dirty.
CIS reading section is dirty.
CIS cleaning brush is dirty.
Shading sheet is dirty.
Select [Service Mode] -> [ADF] -> [Original Stop
Position] -> [Sub Scanning Direction
the necessary adjustment, and the image trouble is
eliminated.
Select [Service Mode] -> [ADF] ->
Adjust] and the image trouble is eliminated.
CIS reading section is dirty.
[3] [4]
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 to determine which
color causes the abnormal image.
K-307
K TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
Result
NO
YES
NO
YES
YES
YES
YES
NO
2-Side] and make
[Home Read Position NO
YES
NO
[2] White band
[4] Color band
Result
YES
NO
Only] and the image
NO
[Halftone 1 to 3
colors
colors
Not
availab
Action
Go to the next step.
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.
Clean.
Clean.
Clean.
Go to the next step.
Go to the next step.
Clean.
Replace the CIS module.
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.
4 Go to the 4-color troubleshooting
procedure.
Go to scanner troubleshooting
procedure.
le
/
(bizhub