Konica Minolta bizhub C360 Service Manual page 775

23. IMAGE QUALITY PROBLEM
23.3.16 Printer monocolor: white lines, white bands, colored lines and colored
bands in main scan direction
A. Typical faulty images
White lines
B. Troubleshooting procedure
Step Section
1 Image check A white line or black line in main
scan direction is sharp.
2 Drum unit/ The surface of the PC drum is
developing scratched.
unit
3 Dirty on the outside.
4 Contact terminals make good con-
nection between each drum unit
and machine.
5 Developing bias contact terminal
makes good connection.
6 PH unit The surface of the PH window is
dirty.
7 The problem has been eliminated
through the checks of steps up to 6.
720
White bands Colored lines
Check item Result
YES Change drum unit.
YES Clean.
YES Clean with cleaning jig.
Field Service Ver. 2.1 Feb. 2012
Colored bands
Action
NO Clean the electrostatic charger wire.
NO Clean contact terminals.
NO Clean contact terminal and check ter-
minal position.
NO Change developing unit.
→ Change image transfer belt unit.
→ Change PH unit.
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