BackForward
Search

User GuidePro C7500/C7500H

Patchy Image (Clear Toner Image)

When printing is performed using the clear toner, patchy images appear where the clear toner overlaps.

illustration of Worm Holes: Clear
illustration of Worm Holes: Clear

Cause:

This may occur when layered special toner (clear) is compressed by pressure during transfer.

Occurrence conditions:

  • High toner adhesion

  • Printing is done at high temperature or humidity

  • Printing solid fills

  • Slippery paper is used

  • Printing on small size of paper

Solution:

(a) Adjusting the image density

1Enable image processing.

  1. Launch Fiery Command WorkStation.

  2. Click the job properties for the print image.

  3. Click the color tab.

  4. Click the color input.

  5. Check the CMYK source setting. If it is set to "ColorWise OFF", change it to another setting.

2When printing images with high toner adhesion and density, enable Toner Reduction.

  1. Launch Fiery Command WorkStation.

  2. Click the job properties for the print image.

  3. Click the image tab.

  4. Select Toner Reduction.

3Print the image. Has the problem been resolved?

Yes

Finished!

No

Go to the next step.

4In the [Machine: Image Quality] group on the [Operator Adjust.] menu, select 0201: [Execute Image Quality Adjustment] and execute [Adjust Image Density].

5Adjust the amount of toner adhesion.

  1. In Adjustment Settings for Operators, select 0202-01 to -05 [Maximum Image Density] and change the amount of toner adhesion.

  2. In the case of [Detailed settings] for custom paper, decrease the image density in the following settings.

    • 1201-01: Maximum Image Density: Black

    • 1201-02: Maximum Image Density: Cyan

    • 1201-03: Maximum Image Density: Magenta

    • 1201-04: Maximum Image Density: Yellow

    • 1201-05: Maximum Image Density: Clear/Special

    • 1201-06: Maximum Image Density: White

    • 1201-07: Maximum Image Density: Metallic

Note

  • Select "Clear/Special" when using Neon Yellow, Neon Pink, or Invisible Red. Select "Metallic" when using Gold or Silver.

  • Doing this may cause color tones to change.

(b) Adjusting the paper transfer speed

1If the paper is not registered as custom paper, register the brand of the paper.

2In [Detailed settings] for the custom paper you are using, select 1341: [Motor Speed], decrease the value in 02: [Paper Transfer Belt] by 0.1%.

3Print the image. Has the problem been resolved?

Yes

Finished!

No

Start over from Step 2.

If the problem persists even after decreasing the value to "-0.5", there is no other solution.

Note

  • Errors may occur depending on the degree of adjustment and conditions. In such a case, contact your service representative.

  • Decreasing the paper transfer roller speed may cause the image to expand or contract in the subscanning direction. Such a problem may be resolved by increasing the value for [Image Magnification] in [Manual Adjustment] in [Adjust image position] on the [Media] hub.

(c) Adjusting the environment

Perform the following solution within the permissible range:

  • Lower the temperature and humidity.

  • Change to non-slippery paper.

  • In [Detailed settings] for the custom paper you are using, select 1237: [Print Speed (Sheet Interval Adj)], decrease the value in the following corresponding settings.

Note

  • Reducing throughput can reduce the occurrence of patchy images when printing with special toner (clear).