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Laser Jet Printer Parts and How it Works (Update)

How a laser jet printer works - a printer is an output device on a computer that has the function of printing soft documents from a computer to hard form on a sheet of paper. In terms of performance, printers are divided into three types, namely dormatric, inkjet and laser jet. Previously we have discussed how inkjet printers work, this time we will discuss the ins and outs of laser jet printers.

Laser Jet printers are printers that perform the printing process using a laser, while scratches on paper are obtained from the presence of toner. This toner is a substitute for ink on the inkjet because this printer is not equipped with an ink cartridge.

What are the advantages of a laser jet printer?

In general, laser printers win on speed and cost of printing per page. This is because it does not use ink so that the printing process takes place quickly. In addition, other advantages are;
  • Good printout
  • Able to print a number of documents in a short time
  • The prints are also durable, not easy to slide and waterproof
  • Can be used to print on various types of paper


As for the weakness, mainly on the price. Actually the price is a reflection of the quality so it is reasonable with the advantages that are obtained, it is equivalent to the price that is priced.

Another weakness is in the consumption of electrical energy, if it is used for home electricity with a power of 900 watts then this will be difficult because this printer uses electricity as the main ingredient to perform its performance. So for small-scale printing this is not good, on the contrary on large-scale use, for example in an agency, it will be more economical.

Parts of a laser jet printer


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Laserjet printers have different parts or components from inkjet printers, this is due to differences in working principles as well. In general, these are the parts of a laser printer.

  • Toner Cartridge, serves as a toner storage that will become powder.
  • Laser Toner Powder, As a filler / refill toner cartridge for laser printers. This powder will later be poured on the surface of the paper to produce scratches.
  • OPC DRUM (Photoreceptor Drum), Serves as a medium for forming electrostatic image patterns that match the image pattern data that we will print on the computer.
  • WIPER BLADES, serves to clean the surface of the OPC drum from residual toner, this residual toner will be present when the powder is not attached to the paper.
  • PCR (Primary Charge Roller), serves to neutralize the surface of the OPC Drum which still has a negative charge due to the effect of laser irradiation after the printing process.
  • DOCTOR BLADES, serves to adjust the amount of toner powder that will be supplied to the magnetic field.
  • MAGNETIC ROLLER SLAVE, serves to take toner powder that has a positive charge from the hopper, this toner will be sent to the surface of the OPC Drum which has a negative charge.
  • RESETER CHIP, functions as a sensor that detects the toner capacity, if this sensor detects the toner powder in the cartridge has run out, then the cartridge cannot be used and the printing process will stop.


As discussed above, laser printers do not use liquids such as ink as their printing media. But using powder ink which is more familiarly called "toner". In order to be able to attach the powder, infrared irradiation is needed, so this printer is called a laser printer.

How Do Laser Jet Printers Work?




The working principle of a jet laser printer uses the static electricity method. The core component of this laser printer is a photoreceptor (OPC Drum) which is generally shaped like a revolver drum (photo conductor) which has a positive charge.

It all started when the Photoreceptor (OPC Drum) was given a positive charge by the Primary Charge Roller (PCR), by providing an electric current to the OPC component. The laser unit (exposition) then shines light towards the rotating drum surface according to the information in the form of an image pattern from the computer. The laser then forms a letter pattern that has a negative charge.

The laser beam is then reflected through a mirror that can move on its own. After the image pattern fits and is complete, the toner powder stored in the hopper (in the cartridge) is taken by the Developer Unit (Magnetic Slave). Because the toner powder is also positively charged, it will stick to the Photoreceptor area (OPC Drum) which has formed an electrostatic pattern, namely the part of the OPC that is exposed to laser light which has formed a pattern according to computer data (negative charge). Then the sheet of paper (with a stronger negative charge than OPC) moves along the belt through a roller on a drum that has been sprinkled with toner powder that already has a pattern.

Before the sheet of paper enters the core chamber of the printer, there is a negatively charged electric current sent by the corona cable (charged roll). This aims to keep the paper attached to the OPC, the paper is irradiated by a laser by a detac corona wire continuously so that the toner powder from the drum moves and sticks to the paper. This is what makes the image pattern according to the computer data can be printed on a sheet of paper, but the process is not finished because it still has to go through the finishing stage.

Finishing or the final stage will occur in the fusher component, here the toner that is not attached to the paper and is still attached to the OPC Drum will be swept away by the Wiper Blade and then directed into the Waste Bin.

In this process, the entire sheet of paper will pass through the fuser gradually. When the paper passes through the fuser, the ink powder from the toner will melt with the fibers on the paper. Then the paper is ejected into the output paper tray. The speed of the paper passing through the roller makes the paper not burn even when irradiated by a laser. The process will then be repeated again for the next printing.

One of the unique things about this printer is that it is more resistant to fading. We know the weakness of inkjet printing is that the ink often fades, that's because the ink only sticks to the surface of the paper. Meanwhile, this irradiation technology allows the powder to adhere to the paper fibers so that in order to fade it, the paper fibers must also fade.

This is a complete article on how a laser jet printer works and its components and functions. You already know, how this printer works. Don't forget to also read other printer-related articles so that you know more, that's all and hopefully can add to our insight.


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