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

Field Service Ver. 2.0 Mar. 2006
25.3.14 Printer 4-Color: white lines in main scan direction, white bands in main
scan direction, colored lines in main scan direction, and colored bands in
main scan direction
A. Typical Faulty Images
White lines in Main
Scan Direction
4036fs4025c0
B. Troubleshooting Procedure
Step Section
Image Transfer Belt
1 Unit
2
3
2nd Image Transfer
4
Roller Unit
Paper path
5
6
Fusing Unit
7
8
Neutralizing Brush
9
10
White bands in Main Colored lines in Main
Scan Direction
4036fs4026c0
Check Item
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 resistance values between the
Neutralizing brush and the ground
terminal is not ∞.
The problem has been eliminated
through the checks of steps up to 9.
25. Image quality problem
Colored bands in
Scan Direction Main Scan Direction
4036fs4027c0
Result
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 Check the contact. Modify.
Change Neutralizing
brush.
NO Change MFP Control
Board.
4036fs4028c0
Action
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