When we make a copy by putting the original in the document feeder, the copy comes with a black line down the sheet. If we make a copy by laying the original on the glass, there is no black line on the copy. We originally thought it was a bad drum, but why wouldn't all copies have a black line down them?
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I have the same problem and was told by the telephone helpdesk that the machine cannot copy double-sided to double-side. The duplexing referred to is copying 2 single-sided documents onto one single sheet on both sides....Like whoever does that! This is misleading on Xerox's part . Colin B.
Clean the document feeder scanner glass. This is the much smaller strip of glass that is to the right of the large main glass. This strip of glass is used ONLY when using the feeder. So if you are getting a dark line when using the automatic feeder but not when laying a document on the glass then just clean the strip glass. 100% sure this is your problem. You may need to clean it several times as I have seen stuff get stuck to this glass.
Good Luck and Thank You for using Fixya.
If the problem only happens on copies or sent faxes then no it is not your drum. There is something on your scan glass. My guess is you are getting the line on your copies when you run the original through the document feeder. If you get lines through the document feeder but not on copies made off the glass then it is a dirty scan glass. There is a thin glass strip where the document feeder feeds the original. Usually something like white out that did not dry smears off an original and ends up on this thin strip of glass. Scratch it off with your finger nail and use some glass cleaner to resolve the problem. The scan glass is about 1/2 an inch to an inch wide and will be on the same side of the machine that the copier feeds the originals in on
The most common cause of blank (void) lines on a scanned document is from whiteout on the glass where the page is scanned when using the document feeder.
If there is a clear mylar sheet on the bottom of the document feeder, the whiteout may be there instead.
If there was dirt or a dark smudge on the glass (or mylar), it would show up as a black line, but whiteout is white, and shows up as a void (blank) line.
What you want to do is this. Turn the machine off, then go to the back of the machine and unplug the document feeder, There is a white connector with 2 thumb screws holding it in place. loosen the 2 thumb screws and unplug the plug. With the feeder unplugged turn the machine back on and let it come to ready. Once it comes to ready turn the machine back off, then plug the document feeder back on and turn the machine back on. That should re detect the document feeder and work fine. The M20 for some reason just forgets it has a feeder and you have to force the plug and play portion of the software to detect the machine not having a feeder then seeing that is has one. I don't know why, not even the newest versions of firmware for the machine resolves that issue. Odd,,,,,