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 magicolor 7450 Service Manual

16. Image quality problem
16.3.13 4-Color: white lines in sub scan direction, white bands in sub scan direc-
tion, colored lines in sub scan direction, and colored bands in sub scan
direction
A. Typical Faulty Images
White lines in Sub
Scan Direction
4036fs4021c0
B. Troubleshooting Procedure
Step Section
Transfer Belt
1
2
3
4 Transfer Roller
Paper path
5
6
Fusing Unit
7
8
9
228
White bands in Sub
Scan Direction
4036fs4022c0
Check Item
Fingerprints, oil, or other foreign
matter is evident on the Transfer
Belt.
Transfer Belt is dirty or scratched.
Cleaning Blade is not effective in
removing toner completely.
Transfer Roller is dirty or scratched.
There is foreign matter on paper
path.
Image Transfer Paper Separator Fin-
gers 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 8.
Field Service Ver. 1.0 May 2006
Colored lines in Sub Colored bands in Sub
Scan Direction
4036fs4023c0
Result
YES Clean with specified solvent.
(See Maintenance.)
YES Clean dirty belt with a soft cloth.
Change Transfer Belt if belt is
damaged.
YES Clean Cleaning blade.
Change Transfer Belt.
YES Change Transfer Roller.
YES Remove foreign matter.
YES Clean or change.
YES Clean.
Change Fusing Unit.
YES Clean.
NO Change Controller Board
Scan Direction
4036fs4024c0
Action