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This is caused by the adf scan glass needing to be cleaned. If you look just to the left of the large glass you will see a thin strip of glass encased in plastic. You need to clean this glass. It may look clean but this glass is only used when using the feeder and sometimes any ink spots or dirt are not visible. If you only get the lines when using the feeder the problem is on this strip of glass.
sounds like cold solder joint in the vertical circuit. May be schematic inside case, or look on main board for silkscreen labels, ones starting with V are for vertical circuit. look at solder side with magnifier and you will most likely fine one or more "cold" broken joints, especially where large wattage resistors or IC's with large heat sinks are attached to the main board. Just reheat them and flow new solder on them and send me 5 bucks (only kidding) should be a good fix.
If the problem only occurs when using the document feeder, the problem is not usually caused by the drum. When using the document feeder, try to notice where the scanner (the light assembly under your scan glass)stops just before the paper is being fed. Some multifunction machines have a small piece of glass that is separate from the large scan glass and the scanner assembly stays parked underneith it as the original is being fed over it. Most likely there is something on the glass where the scanner parks as originals are being fed thru the feeder. When putting your original on the large scan glass to copy, the mark on the glass will only show as a spot, but will show as a vertical line thru the whole copy when using the feeder.