Question about Brother MFC-7340 All-In-One Laser Printer

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When I Scan and PC prints, it comes out Perfect but When I use the Top Feeder to copy I am getting huge line(s) from tom to bottom. Is there a way to do a cleaning on the top feeder of my Brother MFC 7349 printer? I tryed cleaning the drum with a cotton swab while I turned the wheel and still got the lines...

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Yes there is a way to get rid of the lines you are seeing when scanning from the document feeder.

Let me see if I can explain this in a way that you will understand?

Stand in front of your printer with it facing you. Make sure the document feeder is empty. Put your hand in where the paper would go, and pull upward towards you or to the left. This will open the top of the paper feed tray and expose the rollers that bring in the paper. You can use a brush to seep out the debris. This is not likely where you are getting the lines from though!

Where the lines come from are inside the flat bed area. If you open it, you will see a big piece of glass where the paper is placed to scan a document. to the left, you will see another small piece of glass and this is where the lights flash that scan the picture into the scanner. Try taking a slean lint free cloth and wipe the small glass area and the paded lid above it to get rid of any lines that are appearing on your documents.

Posted on Mar 21, 2011

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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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Copier leaves a black line when printing through the top paper feeder. Ok coping from the flatbed


When copying from the feeder the page is fed across a fixed point at the head of the flatbed. Any dirt etc on the glass at this point can present as a dark line running vertically down the printed page. When copying from the flatbed, the scan head is moved down the page so any dirt on the glass will only appear as specs. Try cleaning the glass, especially at the head of the flatbed where the feeder is loading the page to be copied.

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Clean all your glass including the thin strip on the left side that handles scanning for the doc feeder. Run copies both off the glass and the doc feeder. If the line is still there then take off the glass, dust the inside scan cavity and dust your 3 mirrors with a new, lint free rag. Make sure your glass is completely clean before you put it back on.

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1 Answer

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Only when copying? What about printing? There are a couple possible causes. The easy one to check for is to make a copy by laying your original on the glass. Now make the same copy using the automatic feeder on top. If the feeder copy has the lines but the glass copy does not then the problem is coming from the ADF scanner glass which is the thin strip of glass that is just to the right of the large main glass. If so then just clean the strip of glass with a soft cloth and some glass cleaner. Note that sometimes the stuff that might be stuck to the glass is hard to get off. If BOTH the ADF copy and the main glass copy have the lines then most likely the lines are coming from the drum unit. If you have the copier hooked up for use as a PC printer then does the print from the computer have the lines as well? Then it most definately is coming from the drum unit and you would need to replace it. If the PC prints are clean then the drum is not the cause.
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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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There must be a strip of glass about one inch wide, next to
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Clean that strip thourougly. When you use the feeder the pages
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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.

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