Question about Canon imageCLASS D761 Copier

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Bad copies/grey lines

A grey line runs vertically through all copies that I make

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Hi do u have cleaned the scanner miror and the coppy glass may be coz of that u having that grey line
thanks

Posted on May 12, 2010

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I have the exact same problem. It was there since I first bought the MFC-7840W.
Vertical line appears in scans using the automatic document feeder (ADF).
Vertical line does not appear when scanning single page (placing it directly on the glass -- i.e. not using the ADF).

Cleaning the glass strip for the ADF (or the white pressure bar overhead) does not solve the problem.
The problem does not occur with copies using the ADF (using the COPY button which is basically a scan and print). This would suggest that dust and dirt is not to blame because that would also appear on the copies.
But since I believe a copy is basically a scan plus print, they should be using the same electronics -- a hardware problem on the scan would likely appear on a copy also -- there is some difference between how they accomplish this.
It's definitely not a software issue since it occurs on all versions of Windows and Mac OS X (and multiple computers). It also does not matter whether I "push" the scan to the computer by using the scan button on the MFC... or "pull" the scan from the MFC using the Brother Control Center software.

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I dont know what kind of copier you have but white vertical lines are virtually always caused by a dirty charge corona.There is usually a little plastic handle, blue, green or grey, that cleans the charge corona.pull it out ONCE, push it back in and try another copy.If you have an operators manual, it should have instructions for cleaning the charge corona.Good Luck, O'scope

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Is it the same result when you place the original on the glass as when you use the Automatic feeder? If copy is straight when you use the glass, then the rollers on the feeder need cleaning (with a damp cloth) -Lift the cover where paper feeds and clean grey rollers,also, and more importantly, clean the darker roller which has a plastic white roller pressed to it with a heavy spring assembly.
If copies are slanted either way you make a copy, make sure to check the paper guides in the tray are snug

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Connect an external monitor to the laptop and see if it also has the vertical lines. If the external monitor looks fine, then your laptop’s LCD display panel is bad. If the monitor has the vertical lines displayed on it, then your graphics card or motherboard is bad.




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Thank You.

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1 Answer

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Run a copy of something through your machine. IF the lines show up on your copy, and also lines on your incoming faxes, then your drum cartridge is bad.
Replace the drum cartridge with a new one and you should be back in business.

If you have any other questions, please post again.
I hope I have helped you with your question.
Please remember to post a rating if I have helped you.
Have a good day.
Mac =)

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Panel is bad you will have to live with it!

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I had the same problem with my Lnt4071f. I called tech support and they said it was a faulty panel and the entire set had to be replaced. If you have your warrantly still use it, if not you may just be able to replace the panel, but its expensive.

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The horizontal sweep signal to the yoke is bad. Since other problems exist, the problem may be in the IHVT HI voltage transformer area. Check for bad solder around the IHVT pins and yoke plug. I hope this helps. Lee http://www.CrazyComputers.com

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