Konica Minolta bizhub C658 Service Manual page 1637

bizhub C658/C558/C458/C368/C308/C258
Step Section
6 2nd transfer section
7 Fusing unit
8 Fusing unit
(5) Scanner troubleshooting procedure
Step Section
1 Original
2 Original Type
3 When original glass is
being used: Service
Mode -> Scan Area
4 When original glass is
being used
5 When DF is being used:
2nd side: End face of
original is reproduced as
a line
6 When DF is being used:
2nd side: End face of
original is reproduced as
a line
7 • When DF is being
used: 1st side
• When DF-629 is
being used: 2nd side
8 DF-704 or dual scan
document feeder is being
used: 2nd side
16.3.5 Uneven density 1
(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 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.
Dirt or foreign matter on paper path or separation claw
of the fusing unit.
Scratches on belt and roller in fusing unit.
Check item
Original is damaged or dirty.
Select [Copy setting] -> [Original Type] and change the
setting, and the image trouble is eliminated.
Select [Service Mode] -> [Machine] -> [Scan Area] ->
[Image Position: Leading Edge] and make the
necessary adjustment, and the image trouble is
eliminated.
Original glass or original pad is dirty.
Select [Service Mode] -> [ADF] -> [Auto Stop Position
Adjustment] -> [Main Scanning
trouble is eliminated.
Select [Service Mode] -> [ADF] -> [Auto Stop Position
Adjustment] -> [Main Scanning
trouble is eliminated.
Original reading glass or original reading glass cleaning
brush is dirty.
CIS glass or CIS cleaning brush is dirty.
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-309
K TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
Result
NO
YES
YES
NO
Result
YES
YES
NO
YES
NO
NO
(Front)] and the image
NO
(Back)] and the image
YES
NO
YES
NO
Result
YES
YES
Action
Clean or correct the terminal.
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)
• Replace the MFP board.
(bizhub C368/C308/C258
bizhub C658/C558/C458)
Action
Change the original.
Correct the setting.
Go to the next step.
Clean.
Replace the CCD unit. (bizhub
C368/C308/C258 / bizhub C658/
C558/C458)
Go to the next step.
Go to the next step.
Clean.
Replace the CCD unit. (bizhub
C368/C308/C258 / bizhub C658/
C558/C458)
Clean.
Replace the CIS module. (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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