Direction, Colored Lines In Sub Scan Direction, And Colored Bands In Sub Scan Direction; Printer 4-Color: White Lines In Sub Scan Direction, White Bands In Sub Scan - Konica Minolta bizhub C450 Service Manual

18. Image quality problem
18.3.27

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
4036fs4021c0
B. Troubleshooting Procedure
Step Section
Image Check
1
Image Transfer
2 Belt Unit
3
4
Image Transfer
5
Roller Unit
Paper path
6
7
Paper Dust
8
Remover
Fusing Unit
9
10
11
408
White bands in Sub
Scan Direction
4036fs4022c0
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 Fin-
gers are damaged or dirty.
Paper dust accumulates on Paper
Dust Remover.
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 10.
Field Service Ver. 1.0 Mar. 2005
Colored lines in Sub Colored bands in Sub
Scan Direction
4036fs4023c0
Result
YES Clean the Comb Electrode by
moving the Comb Electrode
Cleaning Lever.
YES Clean with specified solvent.
(See Maintenance.)
YES Clean dirty belt with a soft cloth.
Change Image Transfer Belt Unit
if belt is damaged.
YES Clean Cleaning Blade.
change Image Transfer Belt Unit.
YES Change Image Transfer Roller
Unit.
YES Remove foreign matter.
YES Clean or change.
YES Clean.
YES Clean.
Change Fusing Unit.
YES Clean.
NO Change Image Transfer Roller
Unit.
→ Change Image Transfer Belt
Unit.
→ Change MFP Control Board
Scan Direction
4036fs4024c0
Action