Konica Minolta bizhub C35, Service Manual

Page: 274 / 330

DRAFT
Field Service V er. 1.0 Feb. 2010 16. IMAGE QUALITY PROBLEM
235
bizhub C35
TROUBLESHOOTING
16.2.12 Printer monocolor: white lines, white bands, colored lines and colored
bands in sub scan direction
A. Typical faulty images
B. Troubleshooting procedure
A02EF4C507DA
White lines White bands Colored lines Colored bands
Step Section Check item Result Action
1 Image check A white line or black line in sub
scan direction is sharp.
YES Clean the electrostatic charger wire.
2 When printing thick paper, black
lines appear. YES Select [Service Mode]
→
[Printer
Adjustment]
→
[Thick Mode] and set
[Quality Mode].
3 Imaging unit The surface of the PC drum is
scratched.
YES Change imaging unit.
4 Dirty on the outside. YES Clean.
5 Contact terminals make good con-
nection between each imaging unit
and machine. NO Clean contact terminals.
6 Developing bias contact terminal
makes good connection. NO Clean contact terminal and check ter-
minal position.
7 PH unit The surface of the PH window is
dirty. YES Clean with cleaning jig.
8 The problem has been eliminated
through the checks of steps up to 7. NO Change transfer belt unit.
Change PH unit.