Question about Brother MFC-7820N Laser Printer

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Print Problem - vertical lines

When I print multiple copies from my printer through my feeder a continuous vertical line appears on every page approx 1 inch in from the edge of the page. However, when I print from files no lines appear and quality is perfect. Also, when I copy a page from the glass flatbed individually copy qulality is perfect. I have cleaned drums as per manufacturer's instructions to no avail.

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Re: 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.

Posted on Feb 23, 2007

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Re: Print Problem - vertical lines

I have MFC 7820N. Noticed same problem as other when making copies. Vertical line used to appear.

Open the Scanner where you can see the glass - Flatbed ( where you put the documents to copy)
Make sure that Glass is Clean.
Now make there is Glass on left side about 1x9 inch. Make sure this glass is clean. I had rubbery stain on that I had to rub it off.

Vertical line does not appear when I make copy from Feeder or Flatbed.

Posted on Dec 15, 2008

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Re: Print Problem - vertical lines

What techbill suggested actually worked on my Canon PIXMA MP530. To the left of the main glass is a strip of glass with a plastic film. I cleaned everything and I was still getting the vertical streak when it went through the feed. I got a flashlight, and found, on that plastic flap, a pinhead of dirt. I got it off, and wala! the vertical stripe is gone.

Posted on Apr 01, 2008

Re: Print Problem - vertical lines

I own a Brother MFC 7820N. It is fairly new. I have printed or copied a total of 276 pages to date. I was copying a page earlier and noticed a vertical line on the right side of the copy. The line is about 1/2 inch wide. I cleaned the corona wire as per manufacturer's instruction but the line is still there. What should I do?

Posted on Jul 14, 2008

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1 Answer

Horizontal line on printed page

When you use the flatbed the copy is perfect because the ccd sensor is under the glass cover and obviously is free form dust/ dirt.
On the other hand if you use the feeder the ccd sensor is located in between the roller assembly (not sure exactly for this model).
This means that the page is scanned by the ccd in the feeder, any dirt on the ccd will appear as a black line. I assume that you are feeding papers from the side and not from the top that is why you get a horizontal line.

A quick test to see if the ccd sensor is dirty is to feed the paper from the top side to the feeder. If you get a vertical line it is a proof that your ccd sensor needs to be cleaned.
The worst case is that the sensor in the feeder assembly has a tiny spot that is damaged and it is causing the black line.
So , first try the test, then open the feeder assembly, locate the ccd and clean it. Hope that this helps.

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2- Check using Copying a blank paper using only Flatbed if it prints without any line its problem from document feeder Scanning glass
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open up the scanner cover and clean the glass

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please rate solution :)

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