Konica Minolta bizhub C658 Service Manual page 1639

bizhub C658/C558/C458/C368/C308/C258
(4) 4-color troubleshooting procedure
Step Section
1 Paper path
2 Transfer belt unit
3 Transfer belt unit
4 Transfer belt unit
5 Transfer belt unit
6 2ND TRANSFER
SECTION
7 2nd transfer section
8 2nd transfer section
9 Fusing unit
10 Service Mode -> Initialize
+ Image Stabilization
16.3.6 Uneven density 2
(1) Typical faulty images
The arrow in the exemplary image troubles indicates the paper feeding direction.
(2) Initial troubleshooting procedure
Step Section
1 Paper Setting
2 IDC sensor
Check item
There is dirty or foreign matter on paper path.
Lines that can be removed by cleaning are evident on
the transfer belt. (improper cleaning)
Dirt, scratches, or foreign matter on the transfer belt.
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).
Transfer belt rotates faultily.
Dirt or foreign matter on the 2nd transfer roller.
Faulty pressure/retraction operation of the 2nd transfer
roller.
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.
There is dirty or foreign matter on paper path of fusing
unit.
Select [Service Mode] -> [Imaging Process Adjustment]
-> [Stabilizer] -> [Initialize + Image
[Gradation Adjust], and the image trouble is eliminated.
Check item
The paper to be used for printing does not match the
paper type and size of paper setting selected on the
machine.
• IDC sensor is dirty.
• IDC sensor shutter does not operate properly.
K-311
K TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
Result
YES
YES
YES
NO
YES
YES
YES
NO
YES
YES
Stabilization] and
NO
Result
YES
YES
Action
Check and clean the paper path
including the duplex section.
• Check and clean the cleaning
blade.
• Replace the transfer belt unit.
(bizhub C368/C308/C258
bizhub C658/C558/C458)
• Clean.
• Replace the transfer belt unit.
(bizhub C368/C308/C258
bizhub C658/C558/C458)
Clean or correct the terminal.
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)
• Correct.
• Replace the transfer roller
unit. (bizhub C368/C308/
C258 / bizhub C658/C558/
C458)
Clean or correct the terminal.
Clean. (Disassembling the fusing
unit is prohibited.)
Readjust.
• 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)
• Replace the MFP board.
(bizhub C368/C308/C258
bizhub C658/C558/C458)
Action
Make the paper setting again on
the machine.
• Clean.
• Clean or correct the IDC
sensor shutter.
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