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Key Components of a Laser Printer

Have you ever wondered what each of components on your laser printer are for? This brief introduction aims to provide you with an overview so that you will have a better understanding and know when you need to call us for support.

CS310n Colour Laser Printer

Laser

In laser printers, the Laser component is fundamental to the operation of the machine and is in effect a laser gun, controlled by the electronics which fires pulses of light at mirrors inside the printer. These mirrors bounce the light onto a photosensitive drum to form the image you are creating as static electricity.

At Office Technology Corporation we strongly recommend that replacement of the laser component be tackled only by qualified engineers.

Lexmark imaging unit  Part Number 224B6040

Imaging Unit

Often referred to as the Drum or photoconductor unit, the imaging unit is a normally an aluminium cylinder which has been coated with a light sensitive film.  This film reacts to the light bounced from the mirrors to create an image on the drum. This image takes the form of areas of charged static electricity (created by the charge corona) and the intensity of the light dictates the amount of colour, grey, black or white used on the original document.

Charge Corona: Normally integrated within the imaging unit the charge corona is a thin wire within a metal casing that produces an electrical charge on the drum where the light reacts with the light sensitive coating. The purpose of this charge is to attract the positively charged toner onto the drum to create a copy or copies of the original document.

At Office Technology corporation we offer replacement imaging units for Lexmark and Develop Printers for easy installation by users.

502u Ultra High Yield Return Program Toner Cartridge

Toner Cartridges

Contained within a cartridge for ease of handling, toner is finely ground plastic powder that has been dyed, black, cyan, magenta or yellow, when heated; this powder becomes ink. In most instances a finely ground metallic chemical (the developer) that can be electrically charged is also incorporated so that when the electrically charged drum passes the toner cartridge, the developer / toner mix is attracted onto the drum.

In colour printers a number of toner cartridges, each containing a different colour of toner powder sit parallel to the drum to enable good colour rendering.

Fuser Unit

Fuser Unit

Normally, the fuser unit comprises two rollers, the upper roller is heated and is designed to melt the thin film of toner plastic, enabling the ink to be transferred to the paper as it passes between the rollers.

Heated by a temperature controlled lamp, the upper fuser roller is coated with a non-stick silicon coating that can be easily cleaned. The lower roller does not need to be heated and is usually made from soft silicon rubber which holds the paper and helps ensure smooth passage between the rollers.