Brother HL-1040 Quick Setup Manual page 28

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Install the new toner cartridge into the right
hand side of the drum unit. Make sure that
the toner cartridge guide bar is exactly
aligned with the guide slot in the drum unit
and pushed fully home into the drum unit to
ensure that the toner cartridge and the drum
unit fit together correctly.
Gently turn the lever on the toner cartridge
backward until it stops.
Turn the drum unit upside down gently.
Clean the primary corona wire inside the
drum unit by gently sliding the blue tab to
the right and left several times.
Re-install the drum unit into the printer and
close the top cover.
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