Konica Minolta bizhub C658 Service Manual page 1655

bizhub C658/C558/C458/C368/C308/C258
(2) Troubleshooting procedure
Step Section
1 Paper Setting
2 Paper path
3 2nd transfer section
4 Fusing unit
5 Fusing unit
16.3.16 Blank copy, Black copy
(1) Typical faulty images
The arrow in the exemplary image troubles indicates the paper feeding direction.
[1]
[1] Blank copy
(2) Initial troubleshooting procedure
Step Section
1 Service Mode ->
Stabilizer
2 Image check
(3) Engine troubleshooting procedure
Step Section
1 2nd transfer section
2 Transfer belt unit
3 Photo conductor section
4 Photo conductor section
Check item
The paper to be used for printing does not match the
paper type and size of paper setting selected on the
machine.
There is dirty or foreign matter on paper path.
Dirt or foreign matter on the 2nd transfer roller.
There is dirty or foreign matter on paper path of fusing
unit.
Scratches on belt and roller in fusing unit.
[2]
Check item
Select [Service Mode] -> [Imaging Process Adjustment]
-> [Stabilizer] -> [Stabilization
trouble is eliminated.
• Select [Service Mode] -> [Test Mode] ->
Pattern]. Select "SINGLE", "HYPER", "Gradation",
and "1-Sided", enter "120" for Density, and load
tray 2 with A3 paper. This runs a print cycle of 4
colors on one sheet of paper.
• Check the image after printing and the abnormal
image is evident.
Check item
There is a positive contact between the application
terminals of the 2nd transfer and the connection
terminals (T2, E) and ground terminal of the high
voltage unit.
With the color of toner responsible for the abnormal
image, there is a positive contact between the transfer
belt application terminals and the high voltage unit
connection terminals (Y: T1-4; M: T1-3; C: T1-2; K:
T1-1).
The drum unit of the color of toner responsible for the
abnormal image is installed properly.
With the color of toner responsible for the abnormal
image, there is a positive contact between the drum
charge corona bias application terminals and the high
voltage unit connection terminals.
K-327
K TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
Result
YES
YES
YES
YES
YES
NO
[2] Black copy
Result
NO
Only] and the image
[Solid YES
NO
Result
NO
NO
NO
NO
Action
Make the paper setting again on
the machine.
Check and clean the paper path
including the duplex section.
• Remove the foreign matter.
• Replace the transfer roller
unit. (bizhub C368/C308/
C258 / bizhub C658/C558/
C458)
Clean. (Disassembling the fusing
unit is prohibited.)
Replace the fusing unit. (bizhub
C368/C308/C258 / bizhub C658/
C558 / bizhub C458)
Replace the high voltage unit.
(bizhub C368/C308/C258 / bizhub
C658/C558/C458)
Action
Go to the next step.
Go to engine troubleshooting
procedure.
Go to scanner troubleshooting
procedure.
Action
Clean or correct the terminal.
Clean or correct the terminal.
Reinstall.
Clean or correct the terminal.