Brother MFC 4300 - Manual (Page 146)

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Replacing the Toner Cartridge
The MFC can print approximately 2,200 pages with one toner cartridge. When
the toner cartridge is running low, the LCD shows TONER LOW. The MFC is
supplied with a starter toner cartridge that must be replaced after 1,000 pages.
Actual page count will vary depending on your average document type (i.e.
standard letter, detailed graphics).
It is a good idea to keep a new toner cartridge ready for use when you see the
TONER LOW warning.
Discard the used toner cartridge according to local regulations. If you are not
sure of them, call your local Sanitation Department. Be sure to seal the toner
cartridge tightly so toner powder does not spill out of the cartridge. When
discarding used toner cartridges, keep them separate from domestic garbage.
How to Replace the Toner Cartridge
WARNING
Just after you have used the MFC, some internal parts of the MFC will be
extremely HOT! So, never touch the shaded parts shown in the illustration.
Note
We recommend that you clean the MFC when you replace the toner cartridge.
HOT!
Inside the Fax Machine