Konica Minolta bizhub C650 Service Manual page 773

18. Image quality problem
18.3.23 Printer monocolor: colored spots
A. Typical faulty images
B. Troubleshooting procedure
Step Section
Imaging unit
1
2
3
718
Colored spots
AA AA
Check item
Developing bias contact terminal
makes good connection.
The surface of the PC drum is
scratched.
Dirty on the outside.
Field Service Ver. 8.0 Jun. 2008
4036fs4052c0
Result
NO Clean contact terminal and
check terminal position.
YES Change imaging unit.
YES Clean.
Action