Dell B2375dfw Mono Multifunction Printer - Manual (Page 300)

3 With a dry and lint-free cloth, wipe away any dust and spilled toner from the toner
cartridge area and the toner cartridge cavity.
CAUTION: Do not touch the transfer roller inside the printer. Oil from your
fingers may cause print quality problems.
4 Reinsert the toner cartridge and close the front cover.
5 Plug in the power cord and power the printer on.
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