Brother HL 2270DW - Manual (Page 94)

Routine Maintenance
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i When the machine has finished cleaning it returns to Ready mode.
j Repeat steps c to i two more times using a new blank sheet of paper each time. Upon completion
please discard the used paper.
If the problem is not solved yet, follow the steps below:
a Turn off the machine's power switch. Disconnect all the cables, and then unplug the power cord from the
AC power outlet. Leave the machine turned off for at least 10 minutes to cool down.
b Open the front cover.
c
Take out the drum unit and toner cartridge assembly.