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Officejet Pro L7300, L7400, L7500, L7600, and L7700 All-in-One Series - Received Faxes Are Blank or Have Vertical Lines

Issue
Faxes received by the product are blank or the printout shows vertical, black lines through the image or text.
Solution one: Print a print quality diagnostic page
  1. From the product control panel, press the Setup button.
  2. Press the down arrow button to select Print Report and then press OK.
  3. Press the down arrow button to select Print Quality Page and then press OK. The print quality page prints.
      Figure : Print Quality Page
    1. Printer Information: Shows device information (such as the product model number, serial number, and firmware version number), the number of pages printed from the trays and duplexer, the ink level information, and the printhead health status
    2. Test Pattern 1: If the lines are not straight and connected, align the printheads.
    3. Test Pattern 2: If there are thin white lines across any of the colored blocks, clean the printheads.
    4. Test Pattern 3: If there are dark lines or white gaps where the arrows are pointing, calibrate the linefeed.
    If the Print Quality Page prints correctly without any errors, the issue is probably with the sending fax. Try receiving a fax from another fax machine.
    If the Print Quality Page detects print errors, follow the appropriate steps in solution two to correct the errors.
Solution two: Troubleshoot the print quality
Based on the error(s) detected on the Print Quality Page printout, follow the appropriate steps to resolve the issue:
  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.
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.
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.
If the print quality is still bad after performing all the above steps, one or both of the printheads will have to be replaced.
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.

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