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2Open the front cover. Pull the toner cartridge and remove it from the printer.
3With a dry,
NOTE: To prevent damage to the toner cartridge, do not expose it to light for more than a few minutes. Cover it with a piece of paper, if necessary and keep it in a flat and clean place. Also, do not touch the black transfer roller inside the printer.
4Locate the long strip of glass (LSU) inside the top of the cartridge compartment, and gently swab the glass to see if dirt turns the white cotton black.