Printer 4-Color: White Lines, White Bands, Colored Lines And Colored Bands In Main Scan Direction - Konica Minolta bizhub C25 Service Manual

Field Service Ver. 1.1 May 2011
22.2.25 Printer 4-color: white lines, white bands, colored lines and colored bands
in main scan direction
A. Typical faulty images
White lines
B. Troubleshooting procedure
Step Section
1 Transfer belt unit Fingerprints, oil, or other foreign
2
3 Transfer roller
unit
4 Paper path
5
6 Fuser unit
7
8 Neutralizing
brush
9
White bands
Check item
matter is evident on the transfer
belt.
Transfer belt is dirty or scratched.
Transfer roller is dirty or scratched.
There is foreign matter on paper
path.
Image transfer paper separator
fingers are damaged or dirty.
Fusing entrance guide plate is dirty
or damaged.
Fusing paper separator fingers are
dirty.
The resistance values between the
neutralizing brush and the ground
terminal is not .
The problem has been eliminated
through the checks of steps up to 8.
22. IMAGE QUALITY PROBLEM
Colored lines Colored bands
Result Action
YES Clean with specified solvent.
(See Maintenance.)
YES Clean dirty belt with a soft cloth.
Change transfer belt unit if belt is
damaged.
YES Change transfer roller unit.
YES Remove foreign matter.
YES Clean or change.
YES Clean.
Change fuser unit.
YES Clean.
NO Check the contact.
Change neutralizing brush.
NO Change printer control board
A02EF4C508DA
369