Question about Brother MFC 7420 All-In-One Laser Printer

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Line on scanned documents

Whether ADF or on glass the scanned document now has a black line down the center

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  • suewoods Feb 20, 2009

    Thank you...I finally found a "tiny" speck of dirt on the glass and it is working fine.

  • JDTec
    JDTec May 11, 2010

    If the glass is clean, then you have a bad fuser or toner in the optical unit.

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I finally found a tiny speck on the glass (scanning area). Cleaned it, so far it is working just fine.

Posted on Feb 20, 2009

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  • Brother Master
  • 4,338 Answers

If I could be of further assistance, let me know. If this helps or solves the issue, please rate it.
Thanks, Joe

Posted on Feb 20, 2009

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1 Answer

Why does adf cause line in center of printed documents?


Does this happen when when you place a document on the big glass? when you use the doc feeder you are using the small slit glass clean the slit glass if the problem goes away when using the big glass or when you print, then you know the bottom part of the machine is doing ok and its the scanner section which is the big glass area and the slit glass. you may have to to look at the glass at different angles to see the mark.

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My officejet pro 8500A prints black vertical lines down the page when I make a copy. I have cleaned and aligned the printheads. What else can I do?


Happened with me too. Turned out to be a small sticky smudge on the ADF glass. That is the smaller glass scan area to the left of the large glass scanning area.
When using the ADF to scan or copy, make sure the smaller glass area is clean along with the rollers.

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1 Answer

How do i get rid of a black line that ahows up down the r side of scanned documents, there is no line on the originals


If you are using the Automatic Document Feeder (ADF) to scan, you may need to clean the scanner bar glass.
First test: See if the line appears when you scan on the flatbed. If so, it is probably a hardware failure.
If it appears only when using the ADF, you need to clean the ADF.
HP has a general diagnostic and cleaning procedure here:
https://h10025.www1.hp.com/ewfrf/wc/document?docname=c00846928&lc=en&dlc=en&cc=us&destPage=document&product=391182&lang=ru

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1 Answer

Black line in paper


On what operation are you receiving the black line in your paper?

This problem usually appears when you try to scan or copy using your ADF (automatic document feeder).
To remove this black line in your paper, clean the ADF platen glass in your printer and do as well in the flatbed scanner glass. This ADF platen glass can be found right below where the documents in the ADF goes through. Its a glass about 1 inch in with and beside the flatbed scanner glass (the one where your documents is lay down for copying and scanning. Dried ink or paper residue sticked in the glass can cause this line in the paper. Clean it with a a clothe and spray some windex on it.

Good luck!

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1 Answer

Why do I have a black line down the side of my scanned documents?


If you are using the ADF (Automatic Document Feeder) there is likely debris in that section of the scanning glass. The ADF parks the scanner in place and moves the paper over it, if something is on the scanner it will show up as a line. Check the thin section of glass at whichever end of the scanning deck for dust and clean it with a dry towel. If this is happening with documents on the scanner bed the debris is likely in the scanner and will likely need professional servicing.

Jun 09, 2010 | Printers & Copiers

1 Answer

Got a dark line down document when scanner via AFD


When you use the adf, the scanner remains stationary at the far left side of the platen. Check and make sure that the glass is very clean there; use a damp cloth to remove any dirt or other foreign material.

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1 Answer

Black vertical line along left margin when using the adf to scan.


Hi,

Check both the Fuser Unit and the Cartridge for lines . In any of the rollers are found with a line that means it needs to be replaced.

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3 Answers

Black line on document when I scan from platen or ADF or scan to save as PDF.


As a tech I've never seen that happen. from the doc feeder only Yes, not both the feeder and the glass but not show up when you print from the computer ?????????

For sure there is a dot or something on the small strip of glass, only when you do it from the feeder.
the reason is that the document is moving and the dot on the "small" strip of glass now looks like a line to the copier.

You said it also does it when you lay it down on the glass !!??(platen) that should of indicated the drum has a ring around it, but since it doesn't come out on the PC copy then the glass must have a line on it.

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1 Answer

Dell scanner has a line on document when using ADF


Clean the small glass, even the slightest dot, it will interpet as a line.

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