Canon imageRUNNER 2270 Service Manual page 571

Chapter 14
14.2.1.2.4 White Lines in Sub Scanning Direction
0007-7465
<Cause>
The presence of foreign matter inside the developing assembly can make its way to the
developing cylinder, preventing toner from being evenly deposited on the cylinder and, thus
causing white lines.
<Field Remedy>
Replace the Developing Assembly
14-13