How will I know when it is time to replace the toner or drum unit?
When it is time to replace supplies such as the toner or drum unit, an error message will appear on the machine's control panel or in the Status Monitor. For more information about supplies for your machine, you can visit www.brother.com/original/index.html or contact your local Brother dealer. (Page 16)
From the official Brother DCP-B7500D Monochrome Laser Multifunction Printer manual, page 16
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