Printer Monocolor: White Lines In Main Scan Direction, White Bands In Main - Konica Minolta bizhub C650 Service Manual

Field Service Ver. 8.0 Jun. 2008
18.3.16

Printer monocolor: white lines in main scan direction, white bands in main

scan direction, colored lines in main scan direction, colored bands in main
scan direction
A. Typical faulty images
White lines in main
scan direction
4036fs4025c0
B. Troubleshooting procedure
Step Section
Image check A white line or black line in main
1
scan direction is sharp.
Imaging unit The surface of the PC drum is
2
scratched.
3 Dirty on the outside.
Contact terminals make good con-
4 nection between each IU and
machine.
Developing bias contact terminal
5
makes good connection.
PH unit The surface of the PH window is
6
dirty.
The problem has been eliminated
7 through the checks of steps up to 6.
White bands in main Colored lines in main
scan direction
4036fs4026c0
Check item
18. Image quality problem
Colored bands in main
scan direction
scan direction
4036fs4027c0
Result Action
NO Clean the electrostatic charger wire.
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 image transfer belt unit.
→ Change PH unit.
4036fs4028c0
709