Field Service Ver. 1.0 Jun. 2008
19. Image quality problem
351
T
roubleshooting
19.3.28
Printer 4-color: white lines in main scan direction, white bands in main
scan direction, colored lines in main scan direction, and colored bands in
main scan direction
A. Typical faulty images
B. Troubleshooting procedure
A02EF4C508DA
White lines in main
scan direction
White bands in
main scan direction
Colored lines in main
scan direction
Colored bands in
main scan direction
Step
Section
Check item
Result
Action
1
Transfer belt unit Fingerprints, oil, or other foreign
matter is evident on the transfer
belt.
YES
Clean.
2
Transfer belt is dirty or scratched.
YES
Clean dirty belt with a soft cloth.
Change transfer belt unit if belt is
damaged.
3
Transfer roller
unit
Transfer roller is dirty or scratched.
YES
Change transfer roller unit.
4
Paper path
There is foreign matter on paper
path.
YES
Remove foreign matter.
5
Image transfer paper separator
fingers are damaged or dirty.
YES
Clean or change.
6
Fusing unit
Fusing entrance guide plate is dirty
or damaged.
YES
Clean.
Change fusing unit.
7
Fusing paper separator fingers are
dirty.
YES
Clean.
8
Neutralizing
brush
The resistance values between the
neutralizing brush and the ground
terminal is not
f
.
NO
Check the contact modify.
Change neutralizing brush.
9
The problem has been eliminated
through the checks of steps up to 9.
NO
Change printer control board
d
-Color
M
F
201
Y109660-1 Sevice Manual