Replace the printer cartridge again - Shenzhen drum manufacturers
( 1) Don't make the drum unit directly exposed to sunlight or other strong light, the new drum unit has an inky exposure seals, in love before I can't tear off to prevent exposure, installed the rear can be torn off. Put the drum unit from the printer, please put it back immediately or box with thicker lint wrapped up.
( 2) If the drum unit temperature is very low, then move to warmer places and put aside an hour or more time to install the month,
( 3) Do not use hand touch the surface of the photosensitive drum, to prevent the drum surface scratch by hard objects.
( 4) To ensure the drum unit away from the monitor, hard disk drives. Floppy disk drive or any other of magnetic material.
( 5) Drum unit when replacement if there are fall outside the printer toner, had better use a vacuum cleaner gettering, swab with pure alcohol again:
( 6) Do not use the isopropyl alcohol to wipe the drum surface.