Printer Monocolor: Colored Spots - Konica Minolta bizhub C450 Service Manual

18. Image quality problem
18.3.21

Printer Monocolor: colored spots

A. Typical Faulty Images
B. Troubleshooting Procedure
Step Section
Imaging Unit
1
2
3
4
402
Colored spots
AA
Check Item
Developing bias contact terminal
makes good connection.
The surface of the PC Drum is
scratched.
Dirty on the outside.
The problem has been eliminated
through the checks of steps up to 3.
Field Service Ver. 1.0 Mar. 2005
4036fs4052c0
Result
NO Clean contact terminal and
check terminal position.
YES Change Imaging Unit.
YES Clean.
NO Change Imaging Unit.
Action