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Solid black in a copy typically means that the scanner is partially blocked. Open the top, where you'd place a sheet to be copied, and examine the small strip that runs down the side (left, most likely). See if it's clear, or if something is covering part of it.
Most copiers don't use the full size scanning plate for copies, but use a strip that scans the paper as it moves across it. If something blocks part of it, you get the black area.
I will recommend to do a negative post copy. Then check whether solid black or not. If not solid or blur, then the developer material might be dirty or not enough where u need to replace. If only certain area, such as top or bottom part not solid or blur, it might be caused by the roll guide also where u need to replace it. To replace developer is very simple, take out the waste toner box, unplug the connector on the developer unit, loose one screw, and u can take out the unit. On the unit, take out the 2 screws, and u can open the cover.
Take a Normal,reduction and an enlarged copy(at any ratio) of a Newspaper in different size papers. Then check whether the blurred position is at the same position or not.If it is at the same position, check scanner for its free movement, there may be an obstacle which will not allow the scanner to move freely resulting in blurred copy. or else let me know.
I have never heard of a developer moving backwards!!!!!!!!!!!!!!!!???
the motor that runs it, the .... there is too much involved to mention. A developper moving backwards will spill so much toner in the machine anyway.
If you get a copy and then it goes blank, that tells me you have a problem with the SEPERATION UNIT, it may be shorting out causing the paper to rise against the drum giving you blank copies.
A blurr copy tells me there is a problem with the Scanner/Optics area. maybe the rails that the scanner run on are too dry or has a problem, the optics(mirrors) may be misaligned.
Not sure what you mean by (hanging) ??