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This appears to be a scan head problem either not completeing a full travel or a ccd problem
Could even be a piece of some thing come adrift
and masking the ccd- can you see anything like that.
What ever it is it wont be a repair[unless you can fix it your self]
Replacement is only answer I think
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The line issue is caused by something on the image sensor. To get to it and clean it just pull the front up where you put the paper into it to scan. Inside you will find a glass strip, this is the image sensor. Use a paper towel dampened with window cleaner and gently scrubbing the glass strip, After cleaning the strip let it dry for a minute or teo before you close the cover and try a scan. It should be clear and should copy great again.
I hope this helps, if so please rate our solution.
This sounds as if you have some ink/contamination on the small scaning glass that sits to either the left or right of the main glass on the copier.(Depending on the model/make)As your original is scanned over this thin piece of glass the scanning device will see any spots and this will result in a black line down the page.Please clean the glass with a soft rag.
Have you tried cleaning the document feeders Scan Glass? (small glass under doc feeder ~ 1" by 9") Most times there is dirt spot on this glass, causing a shadow on scans and copies.
Try copying from the large glass by lifting doc feeder / platen cover and manually placing original. If no line copying or scanning manually from large glass, then small scan glass is deffenitely the culprit. Hope this helps.
Try leaving the cover open and run a test scan, once with a fresh sheet as the item to be scanned and then a second time without anything on the table.
You may see what is blocking the light source or possibly a defect in it.
Scanning is done left-right, left-right across the width of the page and the vertical stripe indicates that the blockage is present during each scanned line.
In servicing copiers and multifunction machines, I have found a number of curious contaminents, one of the most annoying was a moth, still alive, that would randomly sit on the lamp, causing some pages to come out OK, others not.
If your copies and printouts are coming out fine, then only the scanner can be at fault.