Question about HP Officejet Pro L7780 All-In-One InkJet Printer

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Streaks though the pages

I get voids in the color through the ever page every time. what can I clean or take abart. Printer is 6 months old. Office jet pro 7780. I can change the resolution and it gets better but somethng is wrong.

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Step one: Retry the print job The problem may occur only rarely. If you have not seen it in other printouts, try again. Step two: Increase the print quality mode If reprinting did not help, try increasing the print quality mode.

  1. In the application you are printing from, click File , and then click Print .
  2. Make sure the printer is selected, and then click Properties .
  3. Select the Paper/Quality tab.
  4. In the Print Quality area, choose the next higher quality setting. If the current setting is Draft, choose Normal. If the current setting is Normal, choose Best.
Step three: Print in grayscale (black area streaking only) If the streaks are in a black area of a black and white printout, change to grayscale printing. NOTE: This step does not apply to color printouts.
  1. In the application you are printing from, click File , and then click Print .
  2. Make sure the printer is selected and click Properties .
  3. Click the Color tab, and select Print Grayscale and High Quality .
Step four: Clean the printheads If the print quality is still bad, clean the printheads.
  1. Make sure the printer is loaded with unused white paper.
  2. Open HP Solution Center .
  3. Click Settings , Print Settings , and then select Printer Toolbox .
  4. Click the Service Tab .
  5. Click Clean Printhead , and then click Clean .
Step five: Align the printheads If the print quality is still bad, align the printheads.
  1. Make sure the printer is loaded with unused white paper.
  2. Open the printer Toolbox , and select the Printer Services tab.
  3. Click Align Printheads . The Align Printheads window opens. Click Align .
  4. The printer prints an alignment page. The lines in the patterns should appear to be straight. Click OK when the page finishes printing.
Step six: Calibrate the linefeed If the print quality is still bad, calibrate the linefeed:
  1. Make sure the printer is loaded with unused white paper.
  2. Open the printer Toolbox and select the Printer Services tab.
  3. Click Calibrate Advanced Linefeed . The Advanced Linefeed Calibration window opens. Click OK .
Step seven: Replace one or both printheads If the print quality is still bad after performing all the above steps, one or both of the printheads will have to be replaced. Print a PQ Diagnostic page to see which printhead should be replaced.
  1. Make sure the printer is loaded with unused white paper.
  2. Press the Setup button.
  3. Press 1 and * simultaneously.
  4. Look at the color blocks labeled Test Pattern 2. Some or all of them could show white horizontal streaks. If none of the blocks are streaked, the printheads are okay.
    • If the Black block has lines – replace the KY printhead.
    • If the Cyan block has lines – replace the MC printhead.
    • If the Magenta block has lines – replace the MC printhead.
    • If the Red block has lines – replace the KY printhead.
    • If the Green block has lines – replace the KY printhead.

Posted on Nov 25, 2008

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