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1st the basic cause of dark/grey copies DUST. Clean w/ alcohol cloth then dry cloth totally all mirrors and the platen glass both side. If still dark check the "Optic slit " right in the upper of your halogen lamp remove it, still dark Check your halogen lamp maybe it already oxidized. The last solution adjust the CVR .
fuser drum is bad. photocopier use electricity to transfer the toner to the paper, then it is heat fused to paper. it appears that the problem is occurring around the time that the toner is attracted to the paper.
Whenever you ask about any problem please explain in detail.There are couple of reasons behind the above mentioned problem.Its not clear that copies are all black (full black) or just dark in print density? or its giving a dark shade? As per asked question, the solution is Check the followings1-Scanner mirrors are dirty2-Drum is damaged or faulty3-Charging corona 4-LD unit5-Developer
generally a dampness problem in the transfer seperation coroner to reset fault, turn of machine hold down 2 and 5 and turn on release 2 and 5 key in P then 4 then 5 then P then 0 then 0 then the green copy buttton then turn off then on should warm up if faults again when you try to copy I think you will need a technician hope this helps :)
Do the copies come out totally black or just dark???? Does the copiers scanning lamp turn "ON" when you go to make a copy? If you smell something burning, you may have paper wrapped around the upper fixing roller...