Konica Minolta bizhub C658 Service Manual page 1660

bizhub C658/C558/C458/C368/C308/C258
Step Section
7 Fusing unit
16.3.20 Brush effect, Image bleeding
(1) Typical faulty images
The arrow in the exemplary image troubles indicates the paper feeding direction.
[1]
[1] Brush effect
(2) Initial troubleshooting procedure
Step Section
1 Paper Setting
2 Damp paper
3 Service Mode ->
Stabilizer
4 Service Mode ->
Gradation Adjust
5 Image check
6 Transfer belt unit
7 2nd transfer section
8 Service Mode -> Fusing
Temperature
9 Service Mode -> Fusing
Transport Speed
10 Fusing unit
11 Fusing unit
Check item
Scratches on belt and roller in fusing unit.
[2]
Check item
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.
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", "600dpi", and "Normal", enter
"10" for CD width, "10" 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 and the abnormal
image is evident.
Dirt, scratches, or foreign matter on the transfer belt.
Dirt or foreign matter on the 2nd transfer roller.
Select [Service Mode] -> [Machine] ->
Temperature] and make the necessary adjustment, and
the image trouble is eliminated.
* Increase or decrease the setting value
Select [Service Mode] -> [Machine] ->
Transport Speed] and make the necessary adjustment,
and the image trouble is eliminated.
* Brush effect: Increase or decrease the setting value *
Image bleeding: Decrease the setting value
There is dirty or foreign matter on paper path of fusing
unit.
Scratches on belt and roller in fusing unit.
K-332
K TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
Result
YES
NO
[2] Image bleeding
Result
YES
YES
NO
Only] and the image
NO
[Lattice YES
YES
YES
[Fusing NO
[Fusing NO
YES
YES
NO
Action
Replace the fusing unit. (bizhub
C368/C308/C258 / bizhub C658/
C558 / bizhub C458)
Replace the power supply of
fusing.
Action
Make the paper setting again on
the machine.
Change paper to one just
unwrapped from its package.
Go to the next step.
Go to the next step.
Go to the next step.
• Clean.
• Replace the transfer belt unit.
(bizhub C368/C308/C258
bizhub C658/C558/C458)
• Remove the foreign matter.
• Replace the transfer roller
unit. (bizhub C368/C308/
C258 / bizhub C658/C558/
C458)
Return the setting value to the
original one and go to the next
step.
Return the setting value to the
original one and go to the next
step.
Clean. (Disassembling the fusing
unit is prohibited.)
Replace the fusing unit. (bizhub
C368/C308/C258 / bizhub C658/
C558 / bizhub C458)
Replace the power supply of
fusing.
/