Solution; Printer Monocolor: White Lines In Sub Scan Direction, White Bands In Sub Scan Direction, Colored Lines Colored Bands In Sub Scan Direction - Konica Minolta bizhub C250P Service Manual

25. Image quality problem

25.3 Solution

25.3.1 Printer Monocolor: white lines in Sub Scan Direction, white bands in Sub
Scan Direction, colored lines colored bands in Sub Scan Direction
A. Typical Faulty Images
White lines in Sub
Scan Direction
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B. Troubleshooting Procedure
Step Section
Image check
1
Imaging Unit
2
3
4
5
PH Unit
6
7
346
White bands in Sub Colored lines in Sub
Scan Direction
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Check Item
A white line or black line in sub
scan direction is sharp.
The surface of the PC Drum is
scratched.
Dirty on the outside.
Contact terminals make good con-
nection between each IU and
machine.
Developing bias contact terminal
makes good connection.
The surface of the PH Window is
dirty.
The problem has been eliminated
through the checks of steps up to 6.
Field Service Ver. 2.0 Mar. 2006
Colored bands in
Scan Direction Sub Scan Direction
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Result
NO Clean the Comb Elec-
trode by moving the Comb
Electrode Cleaning Lever.
YES Change Imaging Unit.
YES Clean.
NO Clean contact terminals.
NO Clean contact terminal
and check terminal posi-
tion.
YES Clean with cleaning jig.
NO Change Imaging Unit.
→ Change Image Transfer
Belt Unit.
→ Change PH Unit.
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Action