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

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Verical line(s) problem with canon mp780

While copying I'm having a problem with vertical lines appearing on the left side of each printed copy. Is there a way to correct this problem? Thanks to all who have viewed this. Nick

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Re: verical line(s) problem with canon mp780

Hi Nick, It's ONLY when you copy? I start by cleaning the platen glass. Wipe the Platen Glass with a clean, soft, lint-free cloth moistened with water. Then wipe with a clean, soft, dry, lint-free cloth making sure not to leave any residue, especially on the Platen Glass. If you have trouble getting the scanning area clean, wipe with diluted mild detergent (for dish washing). Do the same thing for the white area under the platen lid. If this does not resolve the problem let me know. His Dudeness

Posted on Nov 17, 2006

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A vertical black line appear on each paper when the document feeder is used to make copies; such vertical line does not appear on papers when copying on the glass surface. How do I resolve this...?

when you open the copier platen cover, left of the copy glass, there is small narrow glass, which is used when you make copies from ADF. Over that glass is plastic protective sheet. Remove it and clean, also clean the glass. Use glass detergent and after cleaning dry it!

Even the smallest dirt can cause lines!

Hope that helps!

Apr 25, 2011 | Canon ImageCLASS MF4370dn Laser All-in-One...

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I am scanning a photo. I have translucent lines running horizontal through the picture before i print it.

Documents scanned/copied from the document feeder pass over a thin glass area where scanning occurs. Clean this area if sent faxes, copies or scans have black or white vertical lines.
  1. Lift the document cover to expose the platen glass.

  2. Wipe the ADF scan area (C) with a clean, soft, lint-free cloth moistened with water.


  3. Then wipe with a clean, soft, dry, lint-free cloth making sure there are no residues left, especially on the platen glass.

  4. Close the document cover and make a copy of a text document to confirm the black line has disappeared.

Dec 20, 2010 | Canon PIXMA MP780 All-In-One InkJet...

3 Answers

Vertical black line in scan document not in copies through document feeder

Lift the lid and to the left of the main glass is a smaller glass; that is what scans during the feeding process. Make sure that it is completely clean; even a speck of dust can cause a line to appear. I took a lens wipe and cleaned mine and my line was gone.

Jun 01, 2009 | Brother MFC-7820N All-In-One Laser Printer

2 Answers

Vertical black line on side of copies only when using autofeed

Clean the small piece of glass on the flat bed. Should be on the left side of the flat bed when you lift the doc feeder.

Apr 11, 2009 | Canon Printers & Copiers

1 Answer

HP Laserjet 3330 printed dark page especially around the middle

Does this happen both when copying and printing?
For printing solution, try another toner cartridge.
If lines continue to appear when copying (primarily through the automatic feeder) then lift the auto feeder, and clean the glass -mainly the narrow piece on the left side.

please rate solution :)

Apr 07, 2009 | HP LaserJet 3330 All-In-One Printer

3 Answers

Copying with page feed results in a vertical line on every page

There must be a strip of glass about one inch wide, next to
the large glass. There is the problem !
Clean that strip thourougly. When you use the feeder the pages
are scanned thru the small strip of glass.

Mar 26, 2008 | Canon PIXMA MP780 All-In-One InkJet...

3 Answers

On my Canon Pixma MP780 a vertical line appears on copies made using ADF

I tried the other solutions listed here - and no luck. After cleaning the inside of the ADF, like the manual suggested - no change. How are you supposed to do that anyway? Deep cleaning the inside of the machine also has nothing to do with it.

I finally figured out why things that I copied with the ADF had lines/marks on them, but those placed directly on the platen (big glass) were fine. When you copy with the ADF, the copy is not being made from the large glass area. Rather, there is a thin glass area right next to it.

Turns out, there were a couple of smudges (goo) on that thin piece of glass which were creating long vertical lines down every sheet. Cleaned the glass - problem solved!

Gosh, I hope this helps someone else save some time, and frustration.

Nov 27, 2007 | Canon PIXMA MP780 All-In-One InkJet...

2 Answers

Canon pixma mp780 - vertical line on printing

Not sure if this will help but there is a small glass panel to the left of your flatbed scanner- this must be clean or else I get a black vertical line in my printing.

Jul 04, 2007 | Canon PIXMA MP780 All-In-One InkJet...

4 Answers

Print Problem - vertical lines

If the problem only occurs when using the document feeder, the problem is not usually caused by the drum. When using the document feeder, try to notice where the scanner (the light assembly under your scan glass)stops just before the paper is being fed. Some multifunction machines have a small piece of glass that is separate from the large scan glass and the scanner assembly stays parked underneith it as the original is being fed over it. Most likely there is something on the glass where the scanner parks as originals are being fed thru the feeder. When putting your original on the large scan glass to copy, the mark on the glass will only show as a spot, but will show as a vertical line thru the whole copy when using the feeder.

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Black Line printing on copies

Just clean the glass top of the scanner and the slit of glass on the left hand side of the scanner.

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