The Brother HL - 2321D is a printer with an ink chip attached. Therefore, when the number of prints reaches the chip limit, the toner or drum error yellow light will light up. At this point, you must replace the toner cartridge or a new drum.

The Brother 2240D is a printer with an ink chip attached. Therefore, when the number of prints reaches the chip limit, the toner or drum error yellow light will light up. At this point, you must replace the toner cartridge or a new drum.