Brother HL-3140CW User Manual page 133

Routine Maintenance
j
Close the top cover of the machine.
When you replace a drum unit with a new one, you must reset the drum counter by completing the following
steps:
a
Press a while holding down Go on the machine's control panel.
b
Press a or b to display Drum Unit. Press OK.
c
Press a or b to display the color of the drum unit that you replaced. Press OK.
d
Press a for Reset to reset the drum counter.
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