Printer Monocolor: White Lines In Main Scan Direction, White Bands In Main - Konica Minolta bizhub C250 Service Manual

Field Service Ver. 3.0 Aug. 2006
18.3.15

Printer 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
Image check
1
Imaging Unit
2
3
4
5
PH Unit
6
7
White bands in Main Colored lines in Main
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.
18. Image quality problem
Colored bands in
Scan Direction Main 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
491