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I presume this happens when you are copying and not just printing from the PC. If so then you probably have tippex on the scanner glass. open the scanner cover and you will see two glasses. the left one is for the adf and the larger one on the right is for the flatbed. I bet you have tippex or something white laying on one of the glasses. To prove this all you need to do is make a copy from the adf and make a copy from the flatbed. The adf one will probably have the white line and the flatbed will not.
What printer do you have? Is the black line appearing on the paper when you print or when you fax/copy something?
If it is the latter, then there will be a mark on the optics glass that needs to be cleaned. Usually people using whiteout when wet causes this.
You will need to lift the cover where the paper goes through and check the glass
Are you sure that there is no lines when you make copies?Because the scaner is used when you send faxes and when you copie, if sensor is bad or dirty lines would be wissible. Clean it very well, with strong detergent, but in small amounts.Scratch the stains from corctour or similar...
Solid white lines are usually caused by something being stuck near the developer roller (ie a scrap of paper). This will cause the developer along with the toner to get scraped off in that area. No toner or developer means no image and therefore white lines. A technician is usually needed in this situation to replace the developer. Some models can be replaced by the user but without knowing your copiers model number it is hard to say. PS one other possibility exists if the white lines are a bit wavy rather than solid and straight. White wavy lines are caused by a transfer corona or transfer roller once again depends on your model.
If the lines are vertical (in the direction the ADF feeds, 11in long for 8 1/2 by 11) You can try cleaning the glass the scanner uses when it's using the document feeder. Pull up the top left part of the printer where the documents feed, there's a little rib in the middle of the side to help you do this, then simply pull up the assembly underneath with all the rollers in it, you should see about an inch of glass underneath and a centimeter long strip of white plastic on the assembly (this serves as the white background when feeding slimmer papers) Clean them both. I'd recomend any glass cleaner, just don't spray it in there, spray it onto a cloth.