Tuya Intercom, China Tuya Intercom System, Tuya Intercom Video Door Phone, Building Tuya Intercom System, Tuya Intercom Manufacturer Zhuhai Mingke Electronics Technology Co., Ltd , https://www.mingke-tech.com
1 Open low-voltage frequency meter shows 0.01KHZ, no power output after high voltage.
Since the frequency meter display is not normal, it can be judged that G1 is not oscillating, and after adjusting W1 is invalid, it is found that the frequency adjustment capacitors C1 and C2 have a touch phenomenon. Troubleshoot after trimming with tools.
2 After the power is turned on, the frequency meter displays normal, but the high voltage has no power output.
In this case, first check whether the voltage on L1 is normal to determine which level the fault is. If it is normal, then the first level is checked backwards. However, it should be noted that since L1, the signal is divided into two ways. Generally speaking, the signal is not Normal will not affect the work of the other way. If the signal disappears at a certain level, it is important to check the power supply and the coupling transformer. The fault in this case is the B4 primary open circuit.
3 boot output current is low, only 1.2A--1.5A, the transducer sounds.
The fault with low power involves more parts. It may be that there is only one way to push the signal. This may be reflected in the voltage at both ends of the B6 secondary (AC voltage to ground, the measurement method is discussed in the corresponding discussion). The level finds the signal voltage to find the fault, and it is also possible that one of the last stage power amplifier tubes does not work, which can be determined by the temperature of the air outlet after the machine has been working for a period of time. Another rare occurrence is that the anode voltage of G7 and G8 is low. It is important to see if BX7-9 has an open circuit. In this example, the BX8 open circuit causes the voltage after rectification to be low, but the fuse will not blow itself. The cause of the fuse should be detected to avoid a larger fault. The cause of the fault in this case is that the rectifier silicon stack is damaged by moisture, and the BX8 fuse causes the G7 and G8 power supply voltages to be low and the output voltage to be low.
4 The failure phenomenon is the same as 3 cases, but the transducer is silent.
This fault is quite special. After inspection, it is found that except for the lower secondary voltage of B6, the amplification of the front level is normal. After the user is asked, the cause of the fault is that the fault occurs after the tube is damaged and replaced. After careful searching, the problem is found: BX7— 9 All fuses, after the other faults are removed, the fuse machine returns to normal. Generally speaking, if there is no anode voltage, the screen current should be small.
5 The fault is that when the high voltage is turned on, the high voltage contactor is disconnected immediately, and sometimes the BX7-9 will be blown.
This type of fault phenomenon indicates that there is a serious short-circuit fault in the high-voltage circuit. You can use the shaker to check the insulation resistance of each component of the corresponding high-voltage part of G7 and G8. If there is a low resistance, first disconnect the capacitor and check one by one. The focus is on silicon stacks and tubes. There is a special case. If the silicon reactor is damaged more than two times at a time, it is necessary to pay attention to whether there is a possibility that the secondary voltage of the three-phase transformer is short-circuited by the primary turn-to-turn, so do not open the high voltage again. If you want to power on the test, at least disconnect the tube and be careful when powering up. Zui is able to determine the fault without powering up to ensure complete security.
6 After the power is turned on, the output current is large, but the transducer is silent.
Check the transducer and matching inductor. The transducer may be damaged and cause a short circuit. When the transducer is short-circuited, it must be replaced in time to avoid more serious consequences.
7 The output current is normal, the frequency is normal, but the cleaning effect is not good, and the product is often cleaned in half.
The main reason for the replacement of the common transducer after the fault is that the new transducer is not installed correctly. The upper transducer should be adjusted to about 2-3 cm away from the upper end of the product. The lower transducer can be placed under the mesh belt. . And the upper and lower transducers are relatively staggered to prevent the ultrasonic vibrations from canceling each other out.
8 burned high-voltage silicon reactor after starting up.
Typical failure analysis of ultrasonic cleaning machine
Typical failure analysis of ultrasonic cleaning machine:
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