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You have vertical lines on copies that are made from originals that were fed through the Document Feeder.
You can probably correct this issue by cleaning the small slit-glass under the document feeder next to the large main glass. Objects such as dust, marks from pens, white-out correction fluid, etc. may have collected on this glass. To remove, wipe with a clean cloth. If cleaner is used, spray a small amount on cloth and wipe glass clean.

Do you have light copies?
Do you have fresh paper in the machine?
Is the add toner light on?

Do you have paper jams?
Is the paper in the tray loaded with the arrow on the label pointed down?

Do you have a service code?
Have you opened and closed the front door of the machine?
Have you turned the machine off and back on?

If pages have dark lines on them, the problem could come from several sources. Most of the time it is the problem of a dirt or debris on the scanner glass or mirrors. If the problem is not on the glass or the mirror it can be in the imaging unit. If you have a cartridge type copier, change the cartridge. This might solve the problem, and the imaging unit is still warrantied, the supplier should replace the cartridge for you. If the copier is a multi-component system (drum, toner, developer, each separate) this makes problem solving more difficult. There are more things to go wrong. Toner is usually not the problem. The drum (OPC) or the developer unit could be the problem. Fusers can cause marks on the page also. They normally leave lines down the page. This is a technician-required problem.

The main causes of the print being duplicated in areas where they are not wanted is the fuser assembly. An improper combination of toner and drum in a toner cartridge could also be the problem. There have been cases where the manufacturer of the machine has produced a faulty part in the fusers and this has caused a problem. The manufacturer in many cases because of the machines being out of warranty when the problem finally occurs has not corrected these. Using a paper that has a thermal ink or plastic (letterhead) can cause the image to be transferred to the rest of the page. Some printing companies are not aware of your applications and can use the wrong inks and cause problems.

The waste toner area could be full or not removing the waste toner properly. Replace or empty and clean the waste hopper. A bad connection between the imaging unit and the machine could cause this. Clean the connections with a dry cloth or towel. If the unit has a toner cartridge the toner cartridge can be defective or have a bad drum connection, replace the toner cartridge, it may clear the problem.

If the page has spots like toner is being “dropped” on the page, the problem is usually the developer unit. The developer unit is seldom able to be rebuilt, and should be replaced. If the spots are repeating down the page there could be a defect on the drum. Scratch from a foreign object or the drum has a “ping” that may be a manufacturers defect. These are often not warranted due to them being so fragile. This could also be a dirty machine that requires cleaning

If you have light lines on a page or voided areas this is caused by a lack of toner on the drum. Insure you have toner and it is getting to the drum. Another problem may be the drum is no longer able to accept the charge to hold the toner. This means you may have to replace the drum unit. If your unit is an inkjet style copier the use or lack of use can cause image problems. The ink could be empty or the ink print head could be clogged from too little use. Many times the problem is not with the machine or its parts at all, but the paper. Paper does absorb moisture, and the toner or ink can’t print on moisture well. These are usually seen as light spots or smears on the paper. About a half inch round and over a large area. If you are not sure put new paper in the unit and see if that corrects the problem. Store your paper in a dry place.

Worn feed and exit rollers can cause the paper to wrinkle, call a technician. A fuser assembly is good for sixty thousand to a hundred thousand pages, after that they can fail easily. Call a technician. Moisture in pages can cause wrinkles, replace the paper. Worn paper trays can also cause jams allowing the paper to feed at an angle.

Moisture in paper or improper paper (check stock, slick paper) often causes jams. A dirty machine with paper dust can cause a jamming problem. Wipe the feed tires and the interior of the machine with a cloth to try and correct the problems. Worn paper path, worn fuser assembly, worn gears, worn feed and exit tires, bad sensors, all cause jamming and require a technician.

If your unit has a toner cartridge, replace it to see if the noise goes way, if not and it is very annoying call a technician. Only a technician corrects most other noises. They could be fans, gears, tires, electrical components, or even body parts. When using transparencies chose only the ones for a copier, others could melt in the fusing assembly and severely damage the machine.

This could be the density is set too dark, try to lighten the image. Most copiers have a density control. The Drum may be near its “life” and could be causing an image problem. Bad Toner can be a problem, some after market toners are much darker than those of the machine maker and can be much darker than what you are use to. Try to adjust the density to compensate. If the problem continues contact your supplier. The toner cartridge could have a problem, replace it to see if that corrects the problem. If it does clear the problem notify that supplier. Your copier could have dirty internal lenses, paper path, connections and mirrors that should be cleaned professionally. If done improperly it could damage the machine.