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

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SOLID VERTICAL LINE ON AUTO FEEDER COPIES

WHEN I MAKE COPIES FROM THE FLATBED THE COPIES ARE CLEAN BUT WHEN I USE THE AUTO FEEDER IT MAKES A SOLID VERTICAL LINE??? PLEASE HELP....

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  • SALLY7861 Oct 07, 2008

    THANKS ALOT IT WORKED. YOU ARE THE BEST!!!!!

  • Anonymous Apr 01, 2014

    In order to get rid of the vertical line caused when using the document feeder to make copies

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Hi Sally,

Open the flatbed lid and look on the left side, I believe there is the flatbed glass and another piece of glass to the left, the small strip of glass is the one used for the automatic document feeder. this piece af glass needs to be clean or you will get a line from top to bottom from any type of speck on the glass. hope this helps... if so please mark as FIXYA!!

Posted on Oct 07, 2008

  • Erin O'Donnell
    Erin O'Donnell Nov 30, 2011

    I agree....you ARE the best! Something so simple, and it drove me nuts for SO long! Now I know where to look for solutions :)

  • Susan Gordon Dec 09, 2011

    Thank you. It worked!!!

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  • 1 Answer

I have the same problem but cleaning the glass didn't help - what else can I try?

Posted on Jan 09, 2009

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Posted on Jan 02, 2017

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The following is provided by courtesy of Lexmark:
Problem Vertical lines; Auto document feeder scan anomaly; ADF scanning problem; Scan issue; Scanner issue; Visible line; Streaks show on page; solid line down the page; Top to bottom line; Smudge runs down the page; Opaque line; Broken line; Bar all the way down the page Solution Overview

This article provides the self-diagnostic steps necessary to evaluate top-to-bottom streaks that appear when copying or scanning.

Important! This is seldom a scanner hardware failure.

The main reason for this anomaly is debris or marks on the scanner glass that is used for Auto document feeder (ADF) page scans.

Printed or Scanned Page Illustration

copyvertstreaks.jpg

Who should consider this article?

Any user of an MFP or All-In-One printer experiencing the following symptoms:

  • -Vertical lines only when using the Autodocument Feeder (ADF).
  • -Observed with any type of scan job (e-mail, ftp, solutions, fax).
  • -However, normal expected output when the page is scanned from the scanner flatbed.



ADF scan behavior

Think of it this way:

  • -The page is pulled from the ADF.
  • -The moving page slides across an ADF-designated portion of glass.
  • -The image sensor, which is located under the glass, reads and interprets the moving page's contents.
  • -Contamination on this ADF glass is seen by the image sensor for the entire length of the page.
  • -The image processor interprets the image sensor's repeated capture of this contamination as a vertical solid line.
  • -Any ADF scan function now exhibits a vertical line.



adfvertscanline.gif




Suggested Diagnosis and Fix




Step Action 1 Locate the portion of the glass designated for ADF scans.
HINT: The glass location differs by model. This area is often separate from the scanner flatbed. Please reference User's Guide for more information if you are having a difficult time locating this designated area.
2 Perform a visual inspection for any of the following recurring culprits:

  • -Clear adhesive tape
  • -Glue
  • -Ink pen
  • -Paper
  • -Marker
  • -White out
  • -Staples
  • -Environmental dust or dirt
HINT: Ink marks can be especially hard to see and almost translucent at first sight. However, the image sensor (CCD) registers them as a mark. 3 Use a clean, soft, moistened cloth to thoroughly clean and remove any marks or debris. 4 Inspect the underbelly or underside of the ADF for any marks or debris. 5 Perform another scan to see if cleaning the glass alleviated the issue. 6 Repeat the procedure if a vertical line still appears.
Remember! Printing and scanning from the scanner flatbed work fine.
7 This time, place an intentional mark on a blank sheet of paper and take note of its location. Now place that sheet of paper in the ADF and make a copy.
8 Evaluate the distance of the vertical line to the your mark. 9 Inspect that area of the glass for further debris or marks and clean as necessary.




Other Possibilities


If... Then... Vertical lines appear only when printing... Consider other printer-related topics such as toner cartridge, charge roll, photoconductor, transfer roll, or fuser. Contact Lexmark Technical Support. Vertical lines appear when you lay the page on the flatbed... Consider other printer-related topics such as toner cartridge, charge roll, photoconductor, transfer roll, or fuser. Contact Lexmark Technical Support. Vertical lines appear on ADF-fed printed copies, but they do not appear on scan-to-network [e-mail, FTP, folder (PC), solutions]... Consider other printer-related topics such as toner cartridge, charge roll, photoconductor, transfer roll, or fuser. Contact Lexmark Technical Support.


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This glass becomes dirty, creating lines on the page.
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