Konica Minolta bizhub C200 Service Manual page 432

Field Service Ver. 2.0 Dec. 2008
19.3.16 Printer monocolor: white lines, white bands, colored lines and colored
bands in main scan direction
A. Typical faulty images
White lines in main
scan direction
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 5.
White bands in main Colored lines in main
scan direction
Check item
19. Image quality problem
Colored bands in main
scan direction
scan direction
Result Action
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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