Remove the drum unit from your printer, push up the lock lever to remove the toner cartridge.
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Remove the new toner cartridge from the bag, gently shake 4-5 times to make sure the powder is evenly distributed and remove the orange protective cover.
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Insert toner cartridge deep into the drum cartridge like a "click" green locking lever.
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Set the drum unit firmly in the designated position of the printer, close the front cover and replace it.
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