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Make multiple copies of Jet black print for example, open the platen cover and then make blank copies.Print out will be jet black.After about 60 to 70 copies background will be adjusted, if not then replace the toner.After replacing the toner if the background is still there then you must replace the developer.
You need to locate the source of strikes. 1) remove toner crg., if it has black lines or dirts on drum replace drum. 2) check/clean copy glass 3) use flash light to check fixing section ( Left sideway of copier small doors ) if damadged replace fixing assy.
Vertical lines mean it is being caused by one of the rollers within the printer. This is usually either the toner cartridge or the fuser assembly. I would try changing out the toner cartridge first even if it is new as sometimes they are DOA and they are much cheaper than the fuser assemblies. If that doesn't work, probably the fuser assembly.
It depends... never use a Reman cart in these machines... only use sharp...especially if the machine is under warranty. Does this happen when, Using the Doc Feeder When making copies from the Glass Or when you print from a computer (assuming you print from a PC) If you print something and this happens then it is inside the machine Probably toner or developer dumping... Take a few pieces of large white paper and cover the entire glass surface... make a copy is the line there? If so see the answer above... if not then close the top and make a copy with no paper on the glass... is that black line there.. If so then your top needs adjustment... One more test If you make a copy using the doc feeder, this black line only occurs when making copies with the doc feed, clean the **** glass, and try again...
1-if you make a copy on the glass instead of the feeder is it still there?
If no, then clean small 1" glass on copier there is a spot on it. even a pencil or pen dot WILL make a line on all copies. easiest way to find it, line up the paper on the small strip of glass and follow there will be something there ( sometimes it's hard to see since the background is black)
2- the drum has a black toner ring around it replace the drum blade or drum unit
the nealy black copies sounds like the drum is going, try adjusting the exposure to light, if it comes out with the whole page the same way but just lighter than change drum. White line sounds like there is something on the coronas.