Faint black bands appear at 60 mm (2.4”) intervals vertical to the direction of paper feed.

Cause:

Periodically changing the speed of paper feed can affect the elasticity of images and lead to unevenness in image texture in the shape of black vertical lines. This can also occur when:

  • Ambient humidity is high
  • Thick paper (above Thickness 3) is used
  • There are large areas of halftone coverage

Solution

  1. Enter the SP mode.
  2. Check the fine adjustment settings of the PTR motor.
    • SP1-012-005: Motor Adj: 95 ppm PTR Motor
    • SP1-013-005: Motor Adj: 110 ppm PTR Motor
    • SP1-014-005: Motor Adj: 135 ppm PTR Motor
  3. Check the fine adjustment settings of the transfer timing roller with SP1-006-001 to 31: Fine Adj Trans Tmg Roll Speed (Type): (Weight)

  4. Are the settings at their lower limits?

    Yes

    Go to the next step.

    No

    Go to Step 8.

  5. Is the ambient temperature higher than 23°C (73.4°F)?

    Yes

    Go to the next step.

    No

    Use different paper.

  6. Is it possible to lower the ambient temperature?

    Yes

    Lower room temperature.

    No

    Use different paper.

  7. Print the image. Is the problem resolved?

    Yes

    Finished!

    No

    Repeat Steps 6 and 7. If the problem persists, go to the next step.

  8. Do a fine adjustment of the PTR motor speed (-0.1%)
  9. Do a fine adjustment of the image transfer roller speed (-0.1%).

  10. Print the image. Is the problem resolved?

    Yes

    Finished!

    No

    Repeat Step 4.

  11. If the problem persists, consult the product specialist.