Brother HL-4040CDN - Manual (Page 129)

Routine Maintenance
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e
Remove the waste toner box from the printer using the green handle.
CAUTION
Handle the waste toner cartridges carefully in case you accidentally spill or scatter toner. If toner scatters
on your hands or clothes, wipe or wash it off with cold water at once.
Note
Discard the used waste toner box according to local regulations, keeping it separate from domestic waste.
If you have questions, call your local waste disposal office.
f
Unpack the new waste toner and put the new waste toner box in the printer using the green handle.