Olivetti d-color MF651, Service Manual, Page: 937 / 1053

Field Service Ver. 2.0 Jul. 2009 22. IMAGE QUALITY PROBLEM
877
TROUBLESHOOTING
22.3.15 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]
o
[Machine]
o
[Thick Paper Mode] and set
[Image Quality].
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 IU 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 imaging unit.
o Change image transfer belt unit.
o Change PH unit.
Y110571-1 Service Manual