Question about Canon PIXMA MP780 All-In-One InkJet Printer

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White line goes across printed words horizontally

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This sounds like the printer needs re-aligned. this should be a setting in your printer software. if you dont have printer software but have just the drivers to make the printer function, then it will be in the printer properties. if you re-align your printer, these white lines between 1 inchs should dissapear. SHOULD. our lexmark printer here has this problem as well, but i dont pay it any attention. as long as it prints im okies with it

Posted on Jun 04, 2010

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Why is there a clear horizontal line within the printed line?


The print-head is like a paint-brush, in that it prints a "band" as it goes across the page.

In your case, some of the ink-jets are CLOGGED, and thus are not shooting ink as the print-head moves HORIZONTALLY across the page.

Run a few "print-head-cleaning-cycles", to try to unclog those ink-jets.

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This evening I bought a new HP Photosmart C4780 printer. I am trying to print photos now and the photos are being printed with small vertical lines across the whole photo. How do I get rid of them?


> I bought a new printer

Take it back, and get one that does work correctly.

> VERTICAL lines ACROSS the whole photo

Hold the paper in "portrait" mode, not "landscape" mode.
Are the lines HORIZONTALLY-ACROSS the paper,
or VERTICALLY-DOWN the paper?

If those lines are WHITE and HORIZONTAL,
then some of the many ink-jets inside the print-head are *CLOGGED*.
Run a "print-head-cleaning-cycle" to try to unclog it.
Or, exercise the WARRANTY, and get it replaced.

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1 Answer

Change black ink and now prints with white lines through the words on every other line


It is CLOGGED print-heads that cause the ink to _not_ be sprayed onto the paper, resulting in "white" horizontal lines.

Run a "print-head-cleaning-cycle", using the Epson software installed when you installed the printer.

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Canon MP980 prints horizontal pink lines across


try to change the color ink. horizontal banding (the pink or other color lines appearing means horizontal banding) when there is a problem on one of the heating element of the printer head. since almost all canon printers have head built in the inks, replacing the faulty ink will solve the problem. if not then the controller of printhead on the carriage and mainboard needs to be checked.

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1 Answer

Prints have a thin white line across all the images printed. Everything else works and prints are ok outside of the thin white line running horizontal across the 5x7 prints.


  • Thermal head — generates heat; prints on paper
  • Platen — a rubber roller that feeds paper
  • Spring — applies pressure to the thermal head, causing it to contact the thermo-sensitive paper
  • Controller boards — for controlling the mechanism
I think that you may need to replace your thermal head, A line means there is a place that the head can not head or it cannot recieve data
http://www.youtube.com/watch?v=LWs74J7EfjM
How to matinence it and clean the head

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so, what sort of text is it you are attempting to print? what program is in use?





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try to replace with colour catridge bye

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