HP Officejet Pro L7780 All-In-One InkJet Printer Logo
Posted on Sep 23, 2010
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My HP Pro 7780 has recently started making copies (through the feeder) with 2 large blank streaks down the middle of the page (lengthwise). I am worried that this is also happening when I send a fax as well. How can I fix this?

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  • Expert 286 Answers
  • Posted on Sep 24, 2010
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Does this happen when you print, or only when you copy? If you print out a configuration or user settings page, or print a page from the computer, is it also missing two vertical lines of print or is it only when you are copying?

If it happens when you print, you may need a cleaning, or you may need to replace the toner or drum cartridge. If it's an inkjet machine, there's a possibility there is some ink or grease on the encoder strip (a small belt-like plastic strip that goes through the print-head carriage).

If it only happens when you copy, test both the flatbed and the document feeder. If it happens on both then you may have a bad scanner. If it only happens when using the document feeder, you likely have some whiteout (or something) on the glass. When you make a copy in the flatbed, the scanner moves across your document. When you make a copy using the document feeder, the document moves across the scanner. In this case, if there is anything on the scanner glass (like whiteout) your copies will be missing a vertical line of print data (it could be white if there is whiteout on the glass, or it could be dark if something dark is on the scanner glass).

Usually you can lift the flatbed cover and look at the glass to see if anything is on it (usually at the left side of the scanner). Clean the glass, first with alcohol to remove the obstruction, and then with a little windex to remove anything the alcohol may have left behind.

  • jolenet Sep 24, 2010

    No, it was only when making copies through the document feeder (the printer and flat bed copies work fine) - 2 large strips of the page were missing (about 2.5" wide each).

  • Anonymous Sep 24, 2010

    Go ahead and inspect the glass under the scanner cover. On the left side should be a separation, and on the left side of that separation you will need to clean the glass.

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