Brother HL 2270DW - Manual (Page 101)

Routine Maintenance
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d Put the protective material in the machine with the "REMOVE" text to the left, as shown in the illustration.
e Put the drum unit and toner cartridge assembly back into the machine.
f
Put the elastic band over the handle of the drum unit, as shown in the illustration.
g
Close the front cover.
h
Put the machine into the bag it originally came in.