Advantech mainboard circuit maintenance method

1. Visual inspection: by looking at the way, whether the machine board card is burned out, less, and other phenomena, to determine the damage

2 touch: the human hand feels the machine board card and other parts have abnormal heating phenomenon (high pressure place is strictly prohibited to touch) to determine whether the parts are damaged.

3 Measurement: with the measurement of the way (such as using a multimeter to measure the resistance impedance tolerance, voltage, current and so on) to measure the machine board card and other parts are damaged

4. Replacement method: In the case of uncertain whether the machine parts are damaged, you can use the method of cross replacement to determine whether the parts are damaged

5. Oscilloscope method: oscilloscope, spectrum analyzer and other equipment to detect waveform signal amplitude, time, frequency size, noise and so on to judge whether parts are damaged

6. Follow the path: in the open circuit according to the line, the principle of the damaged signal end in a way of reasoning forward or backward to find which parts are damaged

7. Burning machine: in the power short circuit of the board card can not determine which components short circuit case can be forced to power the board card (short circuit element will be hot due to current reasons) to determine which parts damaged this method is not applicable to the machine

8. Lead-in signal: In the closed circuit, all kinds of signals are the initial end, and the terminal, can be forcibly assumed to introduce a normal signal into the circuit, to judge the location of parts damage,

9. Disconnect signal: in the open circuit interrupt open middle section, to determine the front or back end, that is not normal, step by step to find the parts damaged

10. Boot test: repeated boot method is used to test which parts of the machine board card are unstable and can not be used, to determine the location of the damaged parts

11. Transposition thinking: some machine board card fault, can be solved by the same or roughly the same line before the machine! The answer may soon be found.