Brother HL-3450CN Service Manual page 314

I-5 Wrinkle / Image Migration
Phenomenon
Banding shadows of different optical density appear due to wrinkle, image migration and
color misregistration occurring on the print paper as shown in
Main Causes
(1) Print paper other than the recommended paper is being used.
(2) The paper discharger unit of the transfer unit is not functioning.
(3) The transfer unit is not locked properly.
(4) Fuser roller is deformed or is reaching the end of life.
(5) One side of the fusing unit is lifted up slightly.
Countermeasures
(1) Use a recommended paper.
(2) Confirm if the transfer unit is properly installed to the paper discharger unit and functioning
normally.
2-1) Push the transfer unit and ensure it is locked at right and left sides.
(3) Refit the fusing unit correctly and lock it in position.
(4) Replace the fusing unit with a new one.
print sample (5) of Page
8-51
HL-3450CN SERVICE MANUAL
8-45.