Vertical White Lines

These are vertical white lines that appear on the paper in the direction of paper feed.

Cause:

This can be caused by dirt on the shield glass, or other foreign particles blocking the path of the laser beam from the laser unit. Developer particles drawn up into the gap between the doctor blade and the development roller could also be causing the problem.

Solution

1. Remove and clean the toner shield glass.

2. Print the image. Is the problem resolved?

   Yes	Finished!
   No	Go to the next step.

3. Clean the development roller and doctor blade cap. (For details, please refer to the Field Service Manual.)

4. Print the image. Is the problem resolved?

   Yes	Finished!
   No	Go to the next step.

5. Replace the development unit.

6. Print the image. Is the problem resolved?

   Yes	Finished!
   No	The cause of the problem requires more investigation. Consult the product specialist.