The maintenance of the electromagnetic furnaces is known to be one of the most common daily items, but since the electromagnetic furnaces themselves are often at high temperatures, damage to the electromagnetic furnaces is common, and the electromagnetic furnaces need to be repaired, so this little piece shows how the electromagnetic furnaces are maintained。
Electromagnetic furnaces are a common electrical device in the home, which makes life easier for people. But there are a lot of problems with the use of electromagnetic furnaces, such as the lack of electrical power in the electromagnetic furnaces. How do we solve these problems? Let's take a look at the story。
Most of this failure was caused by damage to the igbt itself or problems with synchronization, oscillation, driving circuits. As this failure is more severe, damage to other metaware usually occurs together, e. G. G. Bt. And the whole stream of bridges, and when replaced with a new safety tube, do not immediately connect to the power tester, which could have caused another burnout. Replacing the same-specified fuse, then checking with a universal gauge whether the igbt, the whole stream bridge piles were punctured and, if damaged, removing the damaged elements and replacing them with identical metaware. An all-embracing watch will be used to check the pliers d21 and resist r12, which must be removed for accuracy measurements。
(1) the output end of the u2-pressurer (7805) is free of a 5v voltage output, at which point it can be measured whether the input end of the 3-end voltage validator 7805 has an 18v voltage input, and if 18v is entered without a 5v voltage output, it may be u2(7805) damage if the back-stage power supply circuit is excluded. In the absence of an 18v power input, the failure is in the front switch power circuit。
(2) for 18v input voltage, measure whether the positive pole of d31 has a 19v voltage and, if there is 19v voltage, it can be judged to be the d31 drive. If there is no 19v voltage, please measure whether the positive pole of the ec22 is 19v voltage and 19v voltage is measured, indicating that there is a problem with the voltage intersensor l101, which can be replaced。
When measuring the 8th foot voltage of the main chip, it is possible to measure whether the q3 base pole has a voltage of +2. 2v if no r61, z1, r16 can be checked. If the voltage is normal, the following components may be carefully checked in a single meter: q3, r4, c7 and, if the component is normal, the main chip may be replaced。
Check if there has been a failure or penetration of the caps c2 and c3. If one of these two elements is problematic, it leads to irregular work. If the above-mentioned capacitor is normal, the crystal oscillation (8m) will be removed and replaced with a new crystal oscillation tester of the same size. In the case of damage to the crystallization itself, the failure can be ruled out after a good crystallization. If it is still not operational, only the master chip can be replaced。
This is where the maintenance of the electromagnetic furnaces is introduced, and the maintenance of the electromagnetic furnaces is in a lot of ways, like a doctor. If there are friends at home who can break the electromagnetic furnace, they can learn more about it and hopefully help。
