Brother HL-L3230CDW: reset a color toner counter

Use the physical Back and Cancel buttons, then plus to confirm the changed color.

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This is the button-panel procedure for HL-L3230CDW and the other listed LCD models. The HL-L3270CDW touchscreen uses a different confirmation step.

Reset after fitting the new toner

Keep the printer on and open the top toner-access cover after installing the new cartridge.
Hold Back and Cancel together for one to two seconds. Release both, then immediately press Back again.
Use plus/minus to highlight the replaced color and its installed capacity, such as M.TNR-HC for high-yield magenta. Press OK.
At Reset/Exit, press plus. After Accepted appears, close the top cover.

Technical references