At present, due to the excellent performance and efficient printing technology of laser printers, It is developing vigorously in today’s society, the development components (toner cartridges) that play an important role in laser printers are attracting attention and sales are amazing. According to the structural principle, the toner cartridge can be divided into drum and powder integrated (such as HP, Xerox, Samsung, etc.) and drum and powder separated (such as Lenovo, Epson, etc.).
Lasers in a laser printer modulate the computer’s output at high frequencies, replacing the data control system with a character matrix. The laser beam carrying the character information is uniformly scanned onto the photosensitive drum along the axis of the photosensitive drum through the optical system, thereby forming an electrostatic latent image corresponding to the input information, and the toner is adsorbed on the drum by the electric charge on the drum to fill the hidden image. When the drum is rotated, the visible image is transferred to the paper, and then the image is immersed in the fibers of the paper by heat and pressure, and finally solidified on the paper.
Photosensitive Drum： It is made of aluminum and covered with a layer of non-toxic organic light, also known as OPC drum, which can print about 20,000 sheets (A4 format, 5% coverage). the photosensitive drum should avoid the high temperature and high humidity and near fire, and the light environment. At the same time, the bad touch and scratch when cleaning the drum will cause permanent damage to the drum surface coating.
(Note: If the printing time is too long, it will also cause photosensitive drum fatigue, resulting in the printing color light problem )
Magnetic Roller: It is a metal sleeve with a permanent magnetic core, fixed in a powder bin, adsorbed the carbon powder when rotating, and applied the carbon powder to the latent image of the photosensitive drum by the action of electric field and magnetic field.
(Note: The surface coating of the magnetic roller will be worn and dirty, which will result in light printing color and stain)
Doctor Blade: It is composed of a metal frame and a polyurethane blade. It controls the amount of carbon powder on the surface of the magnetic roll evenly and makes the carbon powder friction and electrify.
(Note: The aging of the doctor blade will appear black wide lines that are not clear from the top to the bottom.)
Transfer Roller (printer module): The transfer roller is located on the other side of the printing paper, and since it is applied with a voltage opposite to that of the toner, the toner on the photosensitive drum is transferred to the paper.
（Note: Damage to the transfer roller can cause image positioning errors. If the printing environment is wet or the transfer roller is dirty, the transfer will be poor and the color will be light.）
Fuser Roller(printer module): Composed of hot and cold rollers, the lower pressure roll is made of rubber, and the upper fixing roll is a metal roll coated with a high temperature resistant material, which has an electric heating wire.
(Note:If the temperature and pressure do not meet the requirements, it will cause a hard copy of the final shadow, and it will be blurred by hand wiping. If the upper and lower fixing rollers are damaged or dirty, there will be a series of problems such as double shadow stain and black line. )
Wiper Blade: When the photosensitive drum finishes printing once, the toner image on the drum surface is not 100% transferred to the paper. therefore, the residual powder left over from the previous pattern is scraped off with a rubber cleaning blade. store in the waste toner bin (Of course, this removal must be carried out without scratching the drum.)
(Note: If the cleaning blade is aged and the residual toner cannot be removed, it will adhere to the page below, with irregular black spots and lines.)
Charge Roller: The charging roller itself is applied with both ac and dc voltages, so it has a dual function of charging the surface of the photosensitive drum and removing the residual potential after an imaging.
(Note:Damage or uncleanness of the charging roller and insufficient charging and discharging of the photosensitive drum caused by voltage consumption during operation may cause bottom ash or affect print quality. )
