Circuit board is one of the most common objects in electrical appliances, all electrical appliances are all play an important role in it, because the machine is mainly rely on it to work, so the damage also means that the machine is not in working condition!
For the bad machine, I believe that most beginners will not open the machine for maintenance because they do not understand it very well. For this, I recommend that you open the shell and observe the line first, then do it again, if you have to be careful! Machine, most of them are divided into several piece of circuit board to work, like the power board is to put the grid by the corresponding element to 220 v mains transform into corresponding plate supply voltage required by each plate, the mainboard is equivalent to the control center of the machine, the machine of the brain, is responsible for the machine and the interaction of the data transmission and control of the corresponding work of other modules, thus to achieve machine to complete each action! But to complete such a work, the circuit boards are required to work in a normal working condition, and if there is any damage, as the article begins, the machine will strike!
Although each plate in the machine has different functions, it is basically a piece of board that is assembled together, and its overhaul method is roughly the same. So let me tell you a little bit about my circuit board maintenance technique, and give you a little reference!
Circuit board maintenance can be divided into the offline and online measurement, measurement of bolt test test board is power off to ground resistance of power supply import right, which is a set if resistance is low, or directly short circuit, then the line on the road with short circuit, parts or components breakdown or damage to the chip is basically a short-circuit have trouble with the line, this is about to troubleshoot point, continue to find out the specific situation!
And online test (also is to use an oscilloscope waveform measurement, online test for multimeter is through online testing and break resistance measurement, basically can determine fault, so don't do) is introduced, the online measurement is in the short term after the test, ruled out since there is no short circuit on the circuit board has been charging test each voltage is abnormal test! Like some line break, the power supply will not be able to fail, the more bad elements, let the power to the designated location! Circuit board repair, mainly for the maintenance of the circuit board must be familiar with, to know the board that is a center control area, which is a buffer area, which is the clock and reset, a lot of bat is pretty much the same, as long as pay attention to observe more carefully analyze the overall circuit, sort out board on the corresponding area, it is good to your maintenance!
Each person's maintenance method is different, this depends on how the friends to repair! In addition to the maintenance skill accident, should also be familiar with the corresponding electronic components! Like resistance mainly used for the application of the diode, triode, the function of each chip module should be mastered, not fully mastered, good or bad also need to have a potential cognition! Only in this way can you swim in the sea of repair! There are some shortcomings that I hope you can point out and make up! Thank you!