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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.
The rollers on the feeder can go bad and the best way to solve it is to get a new complete assembly. Check the website under your make and model for the assembly. YOu might also want to check for paper jam
Mite be a problem with your doc feeder. Are you using a doc feeder? If so raise up the doc feeder and place an orgnial on the big glass instead of feeding the orginal thur the docfeeder. Does the line disappear? If it does then the **** glass the small glass used by the docfeeder has a mark on it or dirt. Is your machine a printer also? Does the print have the mark/line on them also. Do any of your machine's internal reports have line on them Meter Read print outs etc.
Try cleaning the rollers inside the scanner including the glass inside and out with a soft damped cloth. Look also for a piece of paper, staple wires, paper clips or pencil lead jammed inside the rollers or somewhere in the corner.
Also, look for a foreign object or substance on the cold cathode tube light and clean it. Try also cleaning the mirror.
Please provide model number......however, if it's a "copier style" if you open the auto feeder, there should be a large contact glass and then a small "****" glass on the side that is used when using the auto feeder -clean this glass thoroughly (clean both while you're at it). If it's just a regular style fax machine, there will just be a small glass under the cover that needs to be cleaned.
have you watched the paper going through the doc feeder are thay goning one by one or is it pulling more then one. try making a copie withe 4 sheets does that work. if not open cover of doc feeder clean rollers. serperation pad. ( pad would be twrods the top of the cover )
C.W.H.
There must be a strip of glass about one inch wide, next to
the large glass. There is the problem !
Clean that strip thourougly. When you use the feeder the pages
are scanned thru the small strip of glass.
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