
22. IMAGE QUALITY PROBLEM
Field Service Ver. 2.0 Jul. 2009
892
TROUBLESHOOTING
22.3.28
Printer 4-color: white lines, white bands, colored lines and colored bands
in main scan direction
A. Typical faulty images
B. Troubleshooting procedure
A02EF4C508DA
White lines
White bands
Colored lines
Colored bands
Step
Section
Check item
Result
Action
1
Transfer belt unit Fingerprints, oil, or other foreign
matter is evident on the transfer
belt.
YES
Clean with specified solvent.
(See Maintenance.)
2
Transfer belt is dirty or scratched.
YES
Clean dirty belt with a soft cloth.
Change transfer belt unit if belt is
damaged.
3
Cleaning brush is not effective in
removing toner completely.
YES
Clean cleaning brush.
Change transfer belt unit.
4
Transfer roller
unit
Transfer roller is dirty or scratched.
YES
Change transfer roller unit.
5
Paper path
There is foreign matter on paper
path.
YES
Remove foreign matter.
6
Image transfer paper separator
fingers are damaged or dirty.
YES
Clean or change.
7
Fusing unit
Fusing entrance guide plate is dirty
or damaged.
YES
Clean.
Change fusing unit.
8
Fusing paper separator fingers are
dirty.
YES
Clean.
9
Neutralizing
brush
The resistance values between the
neutralizing brush and the ground
terminal is not
f
.
NO
Check the contact.
Change neutralizing brush.
10
The problem has been eliminated
through the checks of steps up to 9.
NO
Change printer control board
Service Manual Y110571-1
Summary of Contents for d-color MF651
Page 1: ...d Color MF651 d Color MF551 d Color MF451 Color Printer SERVICE MANUAL Code Y110571 1...
Page 24: ...MEASURES TO TAKE IN CASE OF AN ACCIDENT S 22 Blank Page...
Page 27: ...d Color MF651 d Color MF551 d Color MF451 Color Printer SERVICE MANUAL Code Y110571 1...
Page 1053: ...UPDATING STATUS DATE UPDATED PAGES PAGES CODE 10 2009 1ST EDITION 1053053 Y110571 1...