Two practical little experiences! ! !
1, with a "high, low, off" electric blanket switch connected to the electric iron power line, you can make the electric iron "high" file heating, "low" file insulation, "off" file is disabled. It not only saves electricity, but also prolongs the service life of the soldering iron and the iron tip. It is also very convenient to use! Very practical!
2, with a clean disposable medical syringe, between the syringe and the needle with a lengthened hose, used to extract alcohol cleaning potentiometer, channel buttons, band switches and other components, the scouring force is strong, the cleaning effect is very good; Lubricating oil can also be extracted to lubricate mechanical parts that need lubrication during maintenance. The positioning is accurate, the oil quantity is controllable, and the effect is also good. This method is especially useful when cleaning and lubricating electrical equipment or where there is little space!
The tip of the virtual welding fast judgment! ! Absolutely easy to use! ! ! !
Virtual welding is the most frequently encountered problem in maintenance. There is a good trick when solving this problem. Generally, when cleaning the TV, it is an indispensable step to clean the circuit board. When cleaning the circuit board, do not remove the circuit. The floating ash on the back of the board, if necessary, can be sprinkled up, and then directly washed with a soft brush dipped in alcohol, naturally dry, after drying, you will find that there is a circle or a thick or light black mark around you. The solder fillet can basically be judged as a solder joint. This is because as long as the virtual welding will have gaps of different sizes, and with this method the alcohol will be filled with fine ash to form a clear indication. This method is very effective, avoiding repeated repairs and delays in working hours. If you are interested, you may wish to give it a try.
Quick judgment and maintenance skills in induction cooker repair!The normal induction cooker behaves as follows; normal start, fan turn, normal heating, protection and alarm when there is no pot. Fault performance is varied. There is a small method here; before maintenance, it is recommended to connect the 150W---200W bulb to the current limit on the input power supply to prevent unnecessary damage, and observe the illumination of the bulb. Initially determine the fault location. This saves time and effort, while avoiding detours. Here we need to explain two points; 1, before connecting the bulb and before powering, we must measure the forward and reverse resistance of the power plug. Only when it is greater than 400 ohms, the power can be tested. Otherwise, the cover should be opened. 2. This method can also be used to test the machine after the repair is completed, which can avoid secondary maintenance and fault expansion. The specific observation results are summarized as follows: 1. The power-on light bulb is on; the main circuit has a short circuit. 2, the power is off, can start, but the light bulb is long when heating starts; the synchronous circuit or the oscillation circuit is faulty. 3, power on normal, put the pot heating bulb does not light, and at the same time display the fault code or sound every three seconds or so, indicating that the pot is not checked, the fault is mainly in synchronization, shock, push or PWM pulse width modulation circuit and surge protection Circuits, etc., are more complicated. 4, power on, put the pot to heat, the light bulb is intermittently lit, the fault code is displayed or the sound is heard every 1 to 3 seconds, and the dummy load is also the same. It also shows that the fault is not detected, but the fault is in the current detection circuit or the main circuit capacitor. . The normal should be, the power is normal, the bulb is intermittently lit when the pot is not placed, the light is always bright after the pot is placed, and the brightness changes with the gear position. In addition; the cooker wearing parts are: bridge pile, insurance, fan motor, +5V regulator [7805], varistor, high-power resistor, electrolytic capacitor, power module, ceramic chip and chip capacitor. It should also be noted here that during maintenance, after the boot cover is removed, three insulating mats and a pot tester can be placed on the heating reel, which can save the trouble of disassembling the upper cover multiple times.
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