Instructions to reset the Brother DR-243CL image drum counter
The Brother DR-243CL drum unit page yield / life is controlled by your printer. The printer controls the number of pages you can print using your drum by counting how many times the image drum rotates and then stopping the drum at the set limit. Your printer will shut the drum unit down when it reaches a max page yield of 18,000 pages (measured at only 5% text coverage). You will then have a “replace drum, or drum life end” warning message or series of error lights and you will be unable to print.
Reset the Drum Counter (DCP-L3510CDW/DCP-L3517CDW)
Make sure the machine is turned on.
Make sure the machine's cover is closed.
Hold down OK as you press ↑.
Press OK to select [Drum].
Press ↑ or ↓ to display the toner colour for the drum unit you just replaced, and then
Press OK.
Press ↑ to reset the drum counter.
Reset the Drum Counter (DCP-L3550CDW/MFC-L3710CW/MFC-L3730CDN/MFC-L3750CDW/MFC-L3770CDW)
Make sure the machine is turned on.
Press and hold for about five seconds.
Press [Drum].
Select the toner colour for the drum unit you just replaced.