Printer Monocolor: White Lines In Sub Scan Direction, White Bands In Sub Scan - Konica Minolta bizhub C353 Service Manual

18. Image quality problem
18.3.15 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
B. Troubleshooting procedure
Step Section
Image check A white line or black line in sub
1
scan direction is sharp.
When printing thick paper, black
2 lines appear.
Imaging unit The surface of the PC drum is
3
scratched.
4 Dirty on the outside.
Contact terminals make good con-
5 nection between each IU and
machine.
Developing bias contact terminal
6
makes good connection.
PH unit The surface of the PH window is
7
dirty.
The problem has been eliminated
8 through the checks of steps up to 7.
574
White bands in sub Colored lines in sub
scan direction
Check item
Field Service Ver. 4.0 Jun. 2008
Colored bands in sub
scan direction scan direction
Result Action
YES Clean the electrostatic charger wire.
YES Select [Service Mode] → [Machine]
→ [Thick Paper Mode] and set
[Image Quality].
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 unit.
→ Change PH unit.
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