Monocolor: White Lines In Main Scan Direction, White Bands In Main Scan Direction, Colored Lines In Main Scan Direction, Colored Bands In Main Scan Direction - Konica Minolta magicolor 7450 Service Manual

16. Image quality problem
16.3.2 Monocolor: white lines in Main Scan Direction, white bands in Main Scan
Direction, colored lines in Main Scan Direction, colored bands in Main
Scan Direction
A. Typical Faulty Images
White lines in Main
Scan Direction
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B. Troubleshooting Procedure
Step Section
Imaging Unit The surface of the PC Drum is
1
scratched.
2 Dirty on the outside.
Contact terminals make good con-
3 nection between each IU and
machine.
Developing bias contact terminal
4
makes good connection.
PH Unit The surface of the PH Window is
5
dirty.
The problem has been eliminated
6 through the checks of steps up to 6.
216
White bands in Main Colored lines in Main
Scan Direction
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Check Item
Field Service Ver. 1.0 May 2006
Colored bands in Main
Scan Direction
Scan Direction
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Result
YES Change Imaging Unit.
YES Clean.
NO Clean contact terminals.
NO Clean contact terminal and check ter-
minal position.
YES Clean with cleaning jig.
NO Change Imaging Unit.
→ Change Transfer Belt.
→ Change PH Unit.
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Action