How do I know when it is time to replace the toner or drum on my DCP-B7520DW?
When the time comes to replace supplies such as the toner or drum, an error message will appear on your machine's control panel or in the Status Monitor. For more information about supplies, you can visit www.brother.com/original/index.html or contact your local Brother dealer. (Page 15)
From the official Brother DCP Series B7520DW All-in-One Printer manual, page 15
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