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This black line sounds like it is definately coming from the ADF scanner glass. This is the thinner strip of glass that is located just to the left of the large original glass. You can verify this by making a copy from the large glass instead of using the feeder on top. If the copy comes out clean then it is definately the scanner glass. Just clean the glass well with glass cleaner and a soft cloth. This glass is only used when copying/scanning using the top automatic feeder
Good Luck and Thank You for using Fixya.
Your copier scanner is lock. if you have a user guide then follow the instruction.How can unlock?and where. I know where is ,it is copier delivery side under scanner or copy board please moving unlock position
Your scanner glass, mirrors and lens need to be cleaned.
There is an adjustment you can try.
Press in order. Menu #1934. That will enter diagnostics.
On your menu scroll around to find maintenance, then scroll to Shading adjustment.
Place 5 pieces of paper on the glass and press enter until it runs the shading adjustment. That is the scanner calabration.
That can help. But most likely the mirrors and lass are hazy.
Unlike an old copier where dirty optics showed up as a dark image, dirty scanners see less light reflected from your document and therefore print out what they see which can be streaky, faded and very very poor gray scale.
If you want me to I can send you the steps in disassembling that machine, but it does require pretty much disassembling the machine and that scanner head, you can break the lamp easily.