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Does this happen when when you place a document on the big glass? when you use the doc feeder you are using the small slit glass clean the slit glass if the problem goes away when using the big glass or when you print, then you know the bottom part of the machine is doing ok and its the scanner section which is the big glass area and the slit glass. you may have to to look at the glass at different angles to see the mark.
Happened with me too. Turned out to be a small sticky smudge on the ADF glass. That is the smaller glass scan area to the left of the large glass scanning area. When using the ADF to scan or copy, make sure the smaller glass area is clean along with the rollers.
On what operation are you receiving the black line in your paper?
This problem usually appears when you try to scan or copy using your ADF (automatic document feeder). To remove this black line in your paper, clean the ADF platen glass in your printer and do as well in the flatbed scanner glass. This ADF platen glass can be found right below where the documents in the ADF goes through. Its a glass about 1 inch in with and beside the flatbed scanner glass (the one where your documents is lay down for copying and scanning. Dried ink or paper residue sticked in the glass can cause this line in the paper. Clean it with a a clothe and spray some windex on it.
If you are using the ADF (Automatic Document Feeder) there is likely debris in that section of the scanning glass. The ADF parks the scanner in place and moves the paper over it, if something is on the scanner it will show up as a line. Check the thin section of glass at whichever end of the scanning deck for dust and clean it with a dry towel. If this is happening with documents on the scanner bed the debris is likely in the scanner and will likely need professional servicing.
When you use the adf, the scanner remains stationary at the far left side of the platen. Check and make sure that the glass is very clean there; use a damp cloth to remove any dirt or other foreign material.
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.