Printer 4-Color: White Lines In Sub Scan Direction, White Bands In Sub Scan Direction, Colored Lines In Sub Scan Direction, And Colored Bands In Sub Scan Direction - Konica Minolta bizhub C250P Service Manual

25. Image quality problem
25.3.13 Printer 4-Color: white lines in sub scan direction, white bands in sub scan
direction, colored lines in sub scan direction, and colored bands in sub
scan direction
A. Typical Faulty Images
White lines in Sub
Scan Direction
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B. Troubleshooting Procedure
Step Section
Image Check
1
Image Transfer Belt
2 Unit
3
4
2nd Image Transfer
5
Roller Unit
Paper path
6
7
Fusing Unit
8
9
10
360
White bands in Sub Colored lines in Sub
Scan Direction
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Check Item
A white line or colored line in sub
scan direction.
Fingerprints, oil, or other foreign
matter is evident on the Image
Transfer Belt.
Image Transfer Belt is dirty or
scratched.
Cleaning Blade is not effective in
removing toner completely.
Image Transfer Roller is dirty or
scratched.
There is foreign matter on paper
path.
Image Transfer Paper Separator
Fingers are damaged or dirty.
Fusing Entrance Guide Plate is
dirty or damaged.
Fusing Paper Separator Fingers
are dirty.
The problem has been eliminated
through the checks of steps up to 9.
Field Service Ver. 2.0 Mar. 2006
Colored bands in
Scan Direction Sub Scan Direction
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Result
YES Clean the Comb Elec-
trode by moving the Comb
Electrode Cleaning Lever.
YES Clean with specified sol-
vent. (See Maintenance.)
YES Clean dirty belt with a soft
cloth.
Change Image Transfer
Belt Unit if belt is dam-
aged.
YES Clean Cleaning blade.
Change Image Transfer
Belt Unit.
YES Change 2nd Image Trans-
fer Roller Unit.
YES Remove foreign matter.
YES Clean or change.
YES Clean.
Change Fusing Unit.
YES Clean.
NO Change MFP Control
Board.
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Action