Konica Minolta bizhub C200 Service Manual page 389

19. Image quality problem
19.3.27 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
B. Troubleshooting procedure
Step Section
Transfer belt unit Fingerprints, oil, or other foreign
1
2
3
Transfer roller
4
unit
Paper path
5
6
Fusing unit
7
8
9
350
White bands in sub
scan direction
Check item
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
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 8.
Field Service Ver. 1.0 Jun. 2008
Colored lines in sub Colored bands in sub
scan direction
Result
YES Clean.
YES Clean dirty belt with a soft cloth.
Change transfer belt unit if belt is
damaged.
YES Clean cleaning blade.
Change transfer belt unit.
YES Change transfer roller unit.
YES Remove foreign matter.
YES Clean or change.
YES Clean.
Change fusing unit.
YES Clean.
NO Change printer control board
scan direction
A02EF4C507DA
Action