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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.
Are the lines across the page, in the direction of text, or from top to bottom. If from top to bottom, watch the scanner bar with the cover up, see if anything looks odd. If the paper moves in this machine, like from an auto feeder, it could pick up a streak from something in the path. Checking, this unit is a laser printer. When replacing toner, there usually is a little tab thingy that is supposed to be moved back and forth over a little wire. The wire must be kept clean, too. Also, there may be a white bar with a glass cover that is to be cleaned very carefully every time toner is changed. Find this piece of glass, a speck of dust is probably your culprit.
Yes - surprisingly - we had the same problem, the gray stripe along the side of the page only showed up when the original was fed through the document feeder on top. Cleaned the small area of glass under the feeder repeatedly with no change to the resulting stripe, but then while cleaning the upper roller, above the area of glass where the scan lamp illuminates during the copying from the ADF, we found a small piece of paper adhering to the top roller in the paper path, cleaned it off, and no more band. We didn't see the bit of paper on the upper roller until we rolled it while cleaning. Still can't figure how that made a stripe....but hope this helps you.
Are the lines horizontal or vertical? DO you get lines on B/W copies (black and white) also? If you try to copy a blank white page do you get the lines? Does the toner / lines wipe off after the copy comes out? If the toner wipes off after the copy comes out you have a problem in the fusing unit ( the hot area that fixes the image onto the page). If the lines are vertical then you have something inside the device that is dragging across the page as it goes through the device. If the lines are horizontal then you it could be the drum cleaning blade, the transport blade, or charge roller. The noise could be that one of the blades are bouncing. It could be that a gear is worn. Please give more info on the problem to better help.
Most likely something on the glass. Even a small speck on the glass will cause a horizontal line across the sheet while using the top feeder. Otherwise it would be the drum unit or a scratched fixing film.