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No, a drum unit does not have to be replaced every time you change the toner. When you buy a new Brother toner, you take your existing toner out of the drum unit and install your new toner into the exiting drum unit. Both the new toner and drum unit can then be inserted back into your printer.
The Brother DR3200 drum unit has a duty cycle of 25,000 so it will last a lot longer than a toner cartridge. When your drum unit needs to be replaced, your printer will display a message like ‘Replace Drum Unit’.