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The Truth About Laser
Printer Drum Units
A drum unit contains an electrically charged drum. This charge is created either using a corona wire or a separate charged roller. Some printers have the drum unit integrated with the toner cartridge for example some HP laser printers. Other laser printers require you to acquire a separate drum unit.
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How does it work?
The drum unit attracts toner via electrostatic attraction, also known as static electricity. If the drum is positively charged, the toner particles are also positive. If the drum is negatively charged, the toner particles are charged negatively. The charge on the toner particles causes them to be attracted to the oppositely charged places on the drum, thus creating letters and other content to be printed. As the drum rotates, the letters "painted" on the drum attract toner.
How long do they last?
Manufacturers usually provide life expectancy charts for common printer parts and consumables. Manufacturers rate life expectancy for their printer parts in terms of "expected page-production life" rather than in units of time. Most HP drum units have a page yield between 6000 and 8000 pages.
OEM and Compatible Drum Units, any difference?
The main and most important difference between OEM drum units and compatible or remanufactured drum units is the price. When using a replacement Drum Unit you are using a similar product that has been remanufactured to the same or higher quality standards as OEM.
For more details on Laser Printers and the purpose of drum units check this great article from howstuffworks.com that talks about How Laser Printers Work
+Karla Arostegui
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