Question about Canon imageCLASS D780 All-In-One Laser Printer

1 Answer

Copier print quality

We use a Canon ImageClass D780 copier. Lately when we use the ADF, there is a distinct black line all the way down the page. I have cleaned everything I can clean on the copier, and still the line persists. Is there anything I can do short of bringing in a serviceman?

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert who has written 20 answers of more than 400 characters.


    An expert who has answered 20 questions.

  • Expert
  • 121 Answers
Re: copier print quality

Take a credit card and scrape the glass clean.  You only need to clean along the right side of the glass where the paper passes through.  Dirt that you can't even see will cause the lines.

Posted on Oct 27, 2007

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

My Canon MF4150 multifunction device started displaying streaks (or black vertical lines) on pages scanned via the ADF. These streaks appear when scanning from Windows 7 (64bit home premium) as well as...

Hello I just figuered out this problem. When the paper is feed thru the ADF ( Automatic Document Feeder ) there is a plastic piece with a plastic film. Check to see if #1 that plastic film is clean and #2 That the Film is not bent and created a crease which is the line that shows when try to print or scan using the ADF. Hope this helps

Dec 28, 2010 | Canon imageCLASS MF4150 All-In-One Laser...

2 Answers

Canon d660 imageclass copier

Hello himsmyboy!

Sikna says

The ADF separation pad is the cause. To remove it lift the cover fully up then use a knife to get under the black tape tab at the top right of the large white foam pad. Pull the tape and the white foam pad loose but not completely - leave the bottom attached. Now you can see the ADF separation pad from below. Use a small screwdriver or spring hook to remove the spring and you will be able to wiggle the ADF separation pad out. First take a good look at how it fits in so you can put it back! The problem is caused by the small black foam pad under the white rubbery tape on the ADF pad assembly. I carefully removed the tape from the back edge to expose the compressed black foam pad. I then cut a matching size of 1/16" foam I had in my shop which was actually HP 98A doctor blade seal foam and just stuck it on top of the old compressed foam. (other similar foam should also work) Then I replaced the white rubbery tape and rubbed the edge down well. I then reinstalled the restored ADF pad and the spring which holds it. Last I just pressed the large white foam pad back into position - being sure to pull it with a slight tension as I pressed into place. This fixed the ADF feed and it worked like new again...

Sikna out...

Jan 15, 2008 | Ricoh Aficio SP-C210SF Printer

2 Answers

Black lines

Here you go.
1. Put a paper on the glass don't use the ADF see if you printed copy has a black line on it.

If you do not have a black line on it, do the following.

Lift up the ADF tray go in to additional functions #6 Adjust/Clean and then #2 clean the ADF feeder.

The roller is in the top of the ADF feeder at the right and is white in color. When you press the (set) button you will see it spin.

Also clean the glass you have some whiteout on it. (Look at the glass real good when cleaning it).

Nov 19, 2007 | Canon imageCLASS D880 All-In-One Laser...

1 Answer

Feeder issue


Nov 01, 2007 | Canon imageCLASS D780 All-In-One Laser...

1 Answer

Canon Imageclass D780

Clean the platen glass and make sure the isn't any debris or ink on it, especially by the roller. If you make a copy thru the ADF while the ink is still wet it will deposit on the glass.

Jan 08, 2007 | Canon imageCLASS D780 All-In-One Laser...

Not finding what you are looking for?
Canon imageCLASS D780 All-In-One Laser Printer Logo

216 people viewed this question

Ask a Question

Usually answered in minutes!

Top Canon Printers & Copiers Experts


Level 3 Expert

94113 Answers

old marine
old marine

Level 3 Expert

1313 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

Are you a Canon Printer and Copier Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides