Laser printers are the most widely used office equipment in the office. With their excellent print quality and efficient printing speed, they bring a lot of convenience and quickness to our daily work. In the current time is better than everything else, the full use of laser printers has become a must-have job skill for standard professionals. Although things seem small, everyone is dismissive of such simple questions. It is familiar to a person who works in the office and may use it every day. However, if something goes wrong, it may not know the reason and the solution. If the data is urgent, the printer will print. It is very troublesome to have a fault. The first thing we think of is to find a manufacturer or technician to get help or deal with the problem. However, in waiting for the maintenance service, a lot of time is wasted. Have you ever thought about it, some small problems are that we can solve it ourselves. After my observation and analysis, most of the faults are caused by the user's operation mistakes or the trouble caused by not paying attention to the maintenance of the machine, so it is necessary to cure the symptoms. The principle of letting us find the root cause.
We know that laser printers are laser output technologies that combine laser scanning technology, electronic technology and electrostatic imaging technology. It has the characteristics of fast printing speed, good print quality, high resolution and low noise. It is an important computer peripheral device. With the advent of network printers, it has become more and more widely used in office automation, printing, publishing, scientific research and other industries. Examples of maintenance faults are as follows:
Fault 1: A laser printer image is clearly black and white. The fault still exists after the toner cartridge is replaced and the parts are completely cleaned.
Overhaul method: By maintaining the optical part of the laser printer, the fault is solved, mainly by opening the outer casing of the laser printer, disassembling the black plastic box, carefully rubbing several reflective surfaces of the multi-spindle with a clean lens paper, and then Clean several optical lenses and restore the removed plastic box. Pay attention to the wiring card connector. After turning it on again, the printed handwriting is very full.
Fault 2: A Canon ST laser printer often has a problem that the heating lamp does not illuminate. Only one power light is on after the power is turned on, and the machine cannot work normally.
Overhaul method: It is found that it is not a problem of the fuser, nor a problem of the power supply and the small relay, but a 102J small resistor heated by a small box in the power box next to the power box is not in good contact with the circuit board because It is a two-sided circuit board. It must be welded on both sides. After welding with electric ferrochrome, the fault is eliminated. This fault is common in ST laser printers, but sometimes the heat lamp is not lit, which is a one-way thyristor fault in the power control section. Fixing lamps, thermistors, and thermal protectors are also common. If the fuser lamp is burned out, the thermistor performance is not good and the thermal protector is open for replacement.
Fault 3: The heating light of a Canon BXII laser printer is sometimes bright and sometimes not bright.
Overhaul method: When the heating lamp is not lit, check the connection line of the two lamps with a multimeter, and there are 7 thin wires broken, because the fixing parts of the BXII and KT laser printers are connected to the main unit. It is active, and several wires are often disassembled and easily broken. If the heating lamp does not illuminate frequently, but it can be used normally after a long period of cooling, this is a problem with the thermistor. Replace the new thermistor, and smear the squirting squirting 蛴 S mammothing cap hollow? H let 舻缱枥涮 20k & Omega;, hot 1.45k & Omega;
Fault 4: The output image is light in color, and you can't read the writing.
A canon LBP laser printer, the output image is light, and you can't see the writing. Try to adjust the contrast knob to the maximum position. The output of the sample is still not clear. Consider the dirty surface of the mirror. Wipe the mirror and the focus lens with an alcohol cotton ball. The fault remains. Check if the transfer wire is normal, no abnormality, and clean the wire, the fault has not been eliminated. Check the charging wire of the toner cartridge. It is normal and normal. Check the high voltage and high voltage contacts for no problem, indicating that the fault is not related to the wire.
Further inspection revealed that a spring piece of the sensitive sensor switch of the laser drive circuit was broken, causing the printer to fail to be closed during operation and causing the above failure. After replacing the new spring piece, troubleshoot.