4-Color: White Lines In Main Scan Direction, White Bands In Main Scan Direc- Tion, Colored Lines In Main Scan Direction, And Colored Bands In Main Scan Direction - Konica Minolta magicolor 7450 Service Manual

Field Service Ver. 1.0 May 2006
16.3.14 4-Color: white lines in main scan direction, white bands in main scan direc-
tion, 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
Transfer Belt
1
2
3
4 Transfer Roller
Paper path
5
6
Fusing Unit
7
8
Neutralizing
9 Brush
10
White bands in
Main Scan Direction
4036fs4026c0
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. YES Change Transfer Roller.
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.
16. Image quality problem
Colored lines in Main Colored bands in
Scan Direction Main Scan Direction
4036fs4027c0
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 Image Transfer Belt 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 Controller Board
4036fs4028c0
Action
229