I replaced opc drum and blade(genuin) but after abot 1000 copies black lines on copies . So i replaced aGAIN opc and blade . But after 1 month (about 1k copies again) dark lines appeared on copies due to drum . I checked to find the cause but everything looked ok.The same problem appeared with an 2000 machine . To which i replaced it four times!!! And i couldn't find the problem.
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