A variety of good and bad electrical failure from the probability of the size of the following cases.
1. Poor contact.
Board and slot poor contact, the internal fracture of the cable does not work when it passes, the line plug and terminal contact is not good, components such as false welding are such;.
2. Signal interference.
For digital circuits, under specific conditions, the fault will be presented, there may indeed be too much interference affecting the control system to make errors, but also the board individual component parameters or the overall performance parameters have changed, so that the anti-interference ability tends to the critical point, so that the failure;.
3. Poor thermal stability of components.
From a large number of maintenance practices, including the first electrolytic capacitor thermal stability is not good, followed by other capacitors, transistors, diodes, IC, resistors, etc.;.
4. The circuit board has moisture, dust, etc..
Moisture and dust will be conductive, with resistance effect, and in the process of thermal expansion and contraction resistance value will change, the resistance value will have a parallel effect with other components, this effect is stronger when the circuit parameters will change, so that the fault occurs;.
5. Software is also one of the factors to consider.
Many parameters in the circuit using software to adjust the margin of certain parameters is too low, in the critical range, when the machine operating conditions in line with the software to determine the reasons for failure, then the alarm will appear.
Post time: Dec-17-2021