Brother HL-2150N - Manual (Page 97)

Troubleshooting
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Put the toner cartridge back into the drum unit until you hear it lock into place. If you put the cartridge in
properly, the green lock lever will lift automatically.
l Open the front cover. Put the drum unit and toner cartridge assembly back in the printer.
m
Put the paper tray firmly back in the printer.
n Close the front cover.
o Make sure that the Error LED is now off.