15. IMAGE QUALITY PROBLEMS
15.2 Solution
15.2.1
Printer monocolor: white lines, white bands, colored lines and colored
bands in sub scan direction
A. Typical faulty images
White lines
B. Troubleshooting procedure
Step
Section
1
Image check A white line or black line in sub
scan direction is sharp.
2
When printing thick paper, black
lines appear.
3
Imaging unit The surface of the PC drum is
scratched.
4
Dirty on the outside.
5
Contact terminals make good con-
nection between each imaging unit
and machine.
6
Developing bias contact terminal
makes good connection.
7
PH unit
The surface of the PH window is
dirty.
8
The problem has been eliminated
through the checks of steps up to 7.
168
White bands
Colored lines
Check item
Result
YES Clean the electrostatic charger wire.
YES Select [SERVICE MENU] → [ALIGN-
YES Change imaging unit.
YES Clean.
YES Clean with cleaning jig.
Field Service Ver. 1.0 May 2010
Colored bands
Action
MENT] → [THICK MODE] and set
[IMAGE QUALITY].
NO
Clean contact terminals.
NO
Clean contact terminal and check ter-
minal position.
NO
Change transfer belt unit.
Change PH unit.
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