Brother DR420 Drum Unit: Printing Process

Brother DR420 Drum Unit Cycle

Laser printers are composed of many different parts. Items such as: feeder, fuser, toner cartridge, drum, and more. Today’s focus will be on the drum unit; the unfamiliar key element of a laser printer’s production cycle. Some printer toner cartridges have the drum built in, others offer it as a separate part. This ensures the cost of consumables is down as one drum typically lasts 3-4 toner cartridges. The largest manufacturer to utilize the separate drum and toner method is brother. For example, if you had an HL-2270 Printer, it takes both a TN-450 toner cartridge as well as a brother DR420 drum unit. The role of the drum unit is to provide an electrical static charge to the paper allowing the toner particles to stick to the paper. As the Brother Dr420 drum unit turns is received an electrical imprint to use as a digital image and lays the image onto the paper. As it continues rolling, an intense bright light, erasing the digital image that the drum just transferred to the paper, hits it. Then the cycle continues.

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