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

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Canon Imageclass D780

Printed copies have one horizontial line when using the automatic feed. When putting a copy on the glass and printing there is no line. Where is the line coming from?

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Re: 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.

Posted on Jun 08, 2007

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I just changed my laser cartridge and with the new one in my printed pages have two or three horizontal lines on them

does these lines occures when you print something out or just when you copy something?

If it occures when you print out also check the new toner crg. drum ( green roller ) and if the lines are on its surface change the crg. because that means that the cleaning blade is faulty.

If there isnt lines on drum, and printed image is OK, clean the copy glass ( both platten and adf glass ).

Worst case scenarion is faulty fixing film.

Hope that helped!

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Line appears on copies when using the automatic feeder.

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look to the side of your big glass and you'll see a piece of glass about 1.5" wide. thats the galss that is used for scanning from the feeder. theres got to be something on that glass. possibly white-out or even a small speck of toner can cause that. look closely.


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The first thing you must check is the small scanner glass,this is the narrow glass that the machine is using when you use the dockfeeder,clean that glass and make sure there is no back dots on the glass.Even a small dot can cause lines on your page.But this lines will only be sen if you using the docfeeder.
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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).

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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.

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