Laser printers mainly consist of three parts: laser scanning system, electronic photography system, and control system; Firstly, a pulse signal is generated by the modulation driving circuit to drive the laser head to work. The laser beam is generated by the laser, and the laser beam is deflected by a prism device to shine on a photosensitive drum (also known as a photosensitive selenium drum or selenium drum) that rotates with a fixed step. The photosensitive drum itself is coated with organic material and pre charged. When there is light shining, the resistance of the part illuminated by the light will change, while the part not illuminated by the light will not change. Therefore, a latent image composed of charges - electrostatic latent image - will form on the surface of the selenium drum.
The photosensitive drum passes through the ink roller, and the charged photosensitive drum area will adsorb toner particles (toner has opposite polarity to the surface charge of the photosensitive drum), and the previous latent image will become the real image. The paper is sent in through another transmission system because the printed paper has a charge of the same polarity as the photosensitive drum and is much stronger than the sensory drum. Therefore, the paper passes through the photosensitive drum with toner, and the toner on the surface of the photosensitive drum is attracted to the printed paper; But at this point, the ink powder and printing paper are only combined by the attraction of electric charges. After being heated at high temperatures, the plastic ink powder is melted, and after cooling, it will be fixed on the surface of the paper.
The paper is sent out, but the photosensitive drum is still rotating and will pass through another cleaner to remove the remaining toner before entering the next cycle.
By understanding the working principle of laser printers, it can be seen that the main consumables of laser printers are photosensitive drums and toner, but the problems that may arise are not limited to this. Like the vast majority of normal electronic products, each machine comes with an instruction manual. In addition to operating instructions and product introductions, there are also corresponding usage tips, but how many people will read them one by one?
Generally speaking, there should be no issues with the voltage or printer casing, but for safety reasons, users still need to check if the voltage reaches 220V. When using the printer casing, there must be a good grounding wire; If not equipped, static electricity generated by the printer can cause unstable machine performance, affect sample quality, and in severe cases, damage to the machine and injury to people; And there is a high pressure and temperature inside the printer, so do not open the casing casually.
It is worth noting that copperplate paper cannot be used in laser printers because heating and shaping during the printing process can cause blistering on the copperplate, affecting its use.
After the printer is finished working, maintenance and cleaning work are very important. Special attention should be paid to the cleaning of the optical part to avoid collision; Metal tools should not touch the drum core to avoid permanent damage; During cleaning, pay attention to the laser being invisible and protect your eyes. And users can regularly replace the toner cartridge and refill the toner according to production needs. When replacing toner, it is also very important to clean up the remaining powder in the powder feeding and receiving compartments; After adding toner, shake the toner in the powder feeding bin in parallel and rotate the gear clockwise several times by hand to ensure that the toner adheres evenly to the magnetic roller, ensuring even toner distribution; These operational requirements are relatively good, it is more appropriate to seek professional solutions.