Black spots appear at 314 mm (12.4 inches) intervals.

Cause:

The drum is scratched or stained.

Solution:

  1. Remove the photoconductor unit and check the drum surface. Is the surface dirty?

    Yes

    Clean the drum surface.

    No

    Go to Step 3.

  2. Print the image. Is the problem resolved?

    Yes

    Finished!

    No

    Go to the next step.

  3. Is the surface of the drum scratched?

    Yes

    Replace the drum.

    No

    Consult the product specialist.

  4. If the problem cannot be resolved, consult the product specialist.