1. The reason why the laser printer is not clear
1. The reason why the laser printer is not clear:
(1) Toner cartridge problem (insufficient toner, aging or tingling of toner cartridge parts)
(2) Laser problem (laser dirty)
(3) Fusing part (fusing film worn out) or damaged)
2. The solution for the laser printer is not clear:
(1) Replace the toner cartridge (80% is the toner cartridge problem)
(2) Clean the laser (it will occur if the environment is poor or if it has not been cleaned for a long time)
(3) Press the printer to print, turn off the printer when the paper goes under the toner cartridge, and see the effect under the toner cartridge Will it be light on one side? If it is normal that it does not go to the fixing, and it will be blurred after the fixing, then there is a problem with the fixing film.
Second, laser printer maintenance precautions
1. Before turning on the power, pay attention to the working voltage of the laser printer and whether it meets the external power requirements. The working voltage of laser printers purchased abroad is 110V, so do not connect them incorrectly.
2. The laser printer enters the self-checking state when the machine cover is opened and powered on for inspection. At this time, special attention should be paid, there may be laser leakage, and do not touch the high-voltage part at will, and do not measure with a multimeter, so as to avoid electric shock and burn out the instrument.
3. The temperature out of control will make the machine smell burnt. In this case, the time for power-on inspection should be reduced to avoid damage to the fixing heating roller and the pressure rubber roller due to overheating and melting. It should be noted that the preheating time of laser printers is generally within 1.5 minutes. Therefore, if the preheating exceeds 2 minutes, it is necessary to consider turning off the power to avoid burning out accessories such as heat rollers.
4. Do not use large-capacity fuses or other wires to replace fuses and overload protection components of specified capacity. When replacing the fuse, troubleshoot the fault first, and then replace the fuse with a new one to prevent the fault from expanding further.
5. When measuring the integrated circuit chip, the method of measuring the connection point of the edge circuit of the chip should be adopted. When measuring the pins of the chip, the test leads are short-circuited (because the pins of the integrated circuit are very densely arranged).
6. There are many laser printer connectors, so remember their respective positions, colors, etc. during maintenance, to prevent wrong insertion during reset, resulting in new failures. All wirings must be fixed in their original positions to prevent cross-induction of electromagnetic fields, which may cause print quality degradation.
7. When replacing new components, the same type of components must be used. Even if the components are replaced, the main parameters must be the same and cannot be replaced at will.
8. The laser and optical components of the laser printer cannot be disassembled and adjusted at will, otherwise the laser will be aged, the focus will be shifted, and the printing effect or font deformation will be affected.
9. The toner cartridge assembly of the laser printer should not be disassembled at will, and the photosensitive drum should not be touched by hand, let alone wiped with a solvent, so as not to damage the photoconductive layer. The toner cartridge assembly should be stored in a dark place to avoid Overexposure causes scrap.
10. When a “paper jam” occurs in the printer, immediately turn off the power, stop for a while, and then open the cover, take out the toner cartridge, and then gently pull out the jammed paper in the direction of output. Do not pull forcibly, this will damage the photoelectric sensor lever. After the printer is powered off, there is still high voltage for a short time, so avoid electric shock.
11. Do not adjust the adjustment components on the circuit board at will, so as not to cause the offset of the working point and the offset of the delay circuit, so that the time sequence of each working part is chaotic and cannot be printed normally.
12. Most of the components used in laser printers are imported or special components of various manufacturers. If they really need to be replaced, it is best to seek help from a professional repair station in the nearest area, or consult relevant information to find Substitute components.
