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HP Color LaserJet CP6015 Printer Series - Mottled Print

Issue:
Mottle (blotchiness, non-uniform black, weak black) is the appearance of non-uniformity (un-even color) in a region where the original image is uniform (even color). Most often mottle is observed in black regions but can also be observed in any color where a large area of a single color is printed.
Mottle can occur in any laser printer. It is typically observed when using media that is too rough.
Solution
Two possible solutions are:
  • Change the paper: The easiest way to reduce/eliminate mottle is to use a higher quality, smoother paper. Customers may wish to upgrade to “HP LaserJet 90gsm” (HPJ115 RC, HPJ1124), “HP Color Laser Paper” (HPL285R) or “HP Premium Choice LaserJet Paper”. Of course there is a slight increase in cost for the heavier media but most customers feel that the increase in print quality is worth the price.
  • Change the image printed: For customers that want or need to stick with the lower cost papers, there are two image modifications that they can consider to reduce the mottle level. The first option is to modify the solid areas to be a halftone or line screen pattern. (This can be done via your application, if it has these capabilities.) A second option is to change from a black only to a process black which is a combination of black, magenta, and cyan toner.
      note:
    It is important to note that for a page to print graphics in process back (4-Color), the page must contain at least one pixel of color toner. Changing graphics to 4-Color on a full monochrome page will have no affect.
Selecting process black in the printer driver
  1. Select File, Print, Properties, and then select the Color Tab.
    Figure : Color tab
  2. Select the Manual button, and then select Settings.
  3. Under Graphics, Neutral Grays: select 4-Color. Then select OK, then OK again to close the color tab.
  4. Select OK, then OK again to close the color tab.
Operating Voltage
Mottle can also occur if the voltage drops below 117VAC. The printer will automatically adjust toner quantity downward to ensure adequate fusing. This has the downside of increasing mottle level. To remedy a low voltage condition, the customer could place the printer on an independent circuit with no other devices on it to draw down the voltage. This is not seen as much in 220V environments.
To remedy a low voltage condition, the customer could place the printer on an independent circuit with no other devices on it to draw down the voltage. This is not seen as much in 220V environments.

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